The condition of the surfaces that the rear main seal rides on is critical. It is buried deep, usually under a lot of protective covers, wires, hoses and unfortunately, the bell housing of your transmission. Rear Main Seal The rear main seal keeps oil sealed inside the rear of the engine, where the crankshaft connects with the transmission. Working at Franklin Motors in 1967 – 69 era, I did numerous oil leak and rear seal replacements. Yes, the BlueDevil Rear Main Sealer can be used with synthetic Mobil 1 oil. The seal types are: Rope or … Your car's engine rear main crankshaft seal is designed to give the engine oil leak protection from between the crankshaft output flange and theengine block. Without this working correctly, the transmission won’t run smoothly, and your engine will falter. The rear main seal exists in the back of the engine, around the crankshaft. The rear main seal leak issue is usually caused by a few issues. Nov 5, 2020 #1. cperez7944 Member. If the vehicle was run for too long with water in the oil, it may have damaged the engine bearings to the point where the engine will no longer crank. The reason it is such a costly repair is that replacing it often involves dismantling the transmission and even part of, or all of, the engine. The rear main seal is always on the opposite the side of your engine as the pulleys and belts. Adding dye to the oil can help reveal where the oil is coming from. If you pop your hood and start looking around for the rear main seal, you aren’t going to have much luck seeing it. Any guidance with your product and a 1999 Toyota 4 Runner – V6? I used Blue Devil Rear Main Sealer as prescribed (8 oz per 6 quarts of oil), drove the truck a couple days, and the leak stopped! I have a leak on my rear main seal in my hyundai tucson, where do you check the oil level? Our tech department has responded direct via email. Most oils have chemicals in their additive packages that will condition the seals in the engine. Hello, I strongly believe the real main seal is leaking from an early, rebuilt, 1950’s 8BA Ford Flathead engine. Based on your description, we recommend using the BlueDevil Oil Stop Leak. We recommend having the oil filter housing gasket replaced to stop the oil loss. Easily search thousands of entries to find exactly what you're looking for. The main reason for the cost is usually labour, as the transmission needs to be removed from the vehicle to allow access to the rear main seal. If the Positive Crankcase Ventilation (PCV) system is blocked, it will increase the pressures inside the crankshaft and push out the seal. On vehicles with automatic transmissions, check the flex plate for lateral runout or damage. If you are low on oil, add the product and top it off with oil to get it to the proper level. The seal conditions are depleted over time along with buffers in the oil. BlueDevil Rear Main Sealer is not a petroleum distillate, powder, or hazardous chemical so it will not harm your engine in any way and can stay in your engine oil until your next oil change. It would not have any effect on rope, cork or any other type of material that may have been used. Replace everything in the reverse order. Best Budget. Thank you for asking about your Chevy Malibu. We’ve only heard horror stories about friends who had great reliable vehicles that developed a rear main seal leak and suddenly their car was only fit for a junk yard. The rear main seal, or rear main bearing seal, is a gasket between the engine and the transmission of an automobile. The crankshaft (the internal engine part that the pistons are connected to) sticks out of the rear of the engine, and the flywheel & transmission bolt to this crankshaft. You can check the oil level on the dipstick. So the “rear” in rear main seal refers to the seal’s location on your engine, and not necessarily relative to your vehicle. After two weeks the leak stopped and the Toyota is doing fine. If you have a 1 piece rear main seal (found on most new 351 motors) you will have to remove the transmission to replace the rear main seal. Whereas the Rear Main Sealer is less concentrated and specifically formulated exclusively for leaking rear main seals. The crankshaft (the internal engine part that the pistons are connected to) sticks out of the rear of the engine, and the flywheel & transmission bolt to this crankshaft. Appreciate your feedback. What are the symptoms related to a bad rear main seal? There are no shortcuts or quick fixes if the seal has expired. My question is would it do any good or better to use “two” bottles possibly to correct the problem? If the seal is installed with a coating of oil, it will start to leak in a few miles. I’m at the shop now and they found a cam seal leak. Will your product work on front engine seal as well? The transfer layer prevents wear while sealing better than a silicone or Viton material. A rear main seal, also known as a main seal or rear main bearing seal is located between the engine and transmission. BlueDevil products do not sue any petroleum distillates to recondition seals so our product creates a permanent seal. I’m so thankful that for just $15.00 my vehicle is ruuning just fine. The rear seal fits snuggly around the rear of the crankshaft and keeps the engine oil from escaping. A helpful review focusing on engine components for the ASE PS2 Test. Amade of either rubber of silicone, this main seal is crucial in keeping the liquid where it should be, and typically requires a replacement to be fixed when getting … i have a 2008 Chevy Malibu and have a really bad oil leak coming straight off of the oil filter we have tightened the filter numerous times and it keeps coming loose . This would mean that the engine needs to be replaced. Obviously I don’t want to do any damage to my engine, but would reapply Blue Devil if it was absolutely safe to do so. Thank you for asking about your GMC Sierra. My concern is a non standard oil cooling system that utilizes coolant and can become blocked with sealers. Let’s first break down the name to see what we can learn about the rear main seal. Based on your description, it sounds as though water/coolant is getting into the engine oil, creating the milky oil you are seeing. Location : Rear Anticipated Ship Out Time : Same day - 1 business day Quantity Sold : Sold individually Felpro® BS40621 Rear Main Seal - Rubber, Direct Fit, Sold individually I have not changed the oil since the first time I added the product. The rear main seal is just on the outside of the rear main bearing and it keeps the engine oil from leaking out where your crank shaft exits the engine. I've changed out 3 rear main seals all felpro and all of them leak. Unfortunately, water/coolant getting into the oil would be a tell-tale sign of a blown head gasket. After driving the vehicle for longer periods it doesn’t seem to leak, but on short trips it still drips a little on the exhaust manifold (I can smell it) and leaves about a dime size spot overnight on the driveway. About a month ago I noticed a very small oil leak… 2 drops smaller than golf balls but larger than quarters… after the truck sat in the garage over night. I have a family of 5 and only one working vehicle – a 2001 Toyota Sienna. The rear main seal covers the end of the crankshaft to keep the oil inside the engine. Welcome to the BlueDevil Products Auto Blog! Most rear main seals have a lip that rides on the shaft. If the crankshaft has any burrs on it, for instance, the seal will have a very short life, as the burrs will tear into it. If selling the vehicle or paying for a repair is the absolute last thing you … Your email address will not be published. The difference would be in the location of the seal. A rear main seal, also known as a main seal or rear main bearing seal is located between the engine and transmission. The BlueDevil Oil Stop Leak is a universal application, and will treat leaking oil pan gaskets, valve cover seals, rear main seals, etc. The good news is that BlueDevil has created a way to seal your rear main seal leak easily and permanently without costly maintenance and long projects. Too much pressure will eventually cause the lip to balloon and allow oil to pass. anyone here had an issue similar to this? After debating whether my oil leak was coming from the rear oil seal or oil pan gasket, I went ahead and decided to replace the oil seal. Rear Main Seal Oil leaks from the rear main seal on the Ford Y bock engine continues to be a hot subject. purchase BlueDevil Rear Main Sealer directly from BlueDevil, http://store.gobdp.com/oil-stop-leak-49499/, How to Flush the Radiator in Your Car or Truck. Where is the rear main seal at on a 1982 f250 auto with a 400 and do you have to remove the tryanny or the motor or both? Since the crank shaft has the toughest job, it gets the biggest and best bearings to make sure it can stand up to the work load. You should expect to start seeing results after approximately 100-200 miles of driving. and it seals!! The rear main seal is situated just outside of your rear main bearing, which supports the crankshaft for your motor in your engine. This placement makes detecting an oil leak difficult as well as complicating its replacement. With only one income, another vehicle is just not possible at the moment. Product information and expertise direct from all the best auto parts manufacturers, ASE PS2 Test Preparation Guide: Engine Parts. I had the valve covers re-gasketed and that helped some. I put blue devil rear main seal leak was fine in 30 minutes in my 1988 Honda accord, thanks blue devil. Based on your description, we recommend using the BlueDevil Oil Stop Leak (http://store.gobdp.com/oil-stop-leak-49499/) for your front engine seal leak. Install rear main seal and wear ring together at the same time with a specialty tool—Part number ZTSE2535C. Discussion Starter • #1 • Nov 20, 2016. Solving why the seal failed in the first place is critical to preventing a labor … You can expect to see results after about 100-200 miles of driving. Discussion Starter • #1 • Jan 13, 2020. The pressure inside the crankcase will push the lip onto the shaft. any pointers I might be missing? Some people are getting quotes of up to $2,500 dollars on some vehicles, which is way to expensive for what I was trying to do… Some of the things I do today I learned back then. If the oil is not changed regularly, it will cause the seal to degrade. Some rear main seals need to be installed dry. The more in depth answer is: A rear main seal, also known as a main seal or rear main bearing seal is located between the engine and transmission. On most engines, oil leaks can occur above and below the rear main seal. Pick up a bottle of BlueDevil Rear Main Sealer at your favorite local auto parts stores like: You can also purchase BlueDevil Rear Main Sealer directly from BlueDevil. Alternative Options. Also, The installation technique of a rear main rope seal, was slowly being lost as they diminished in use. Seal types There are three types of rear main crankshaft seals in use today; each offers its own features and benefits, along with concerns. It can be expensive to … Based on your description, there may be an issue with the oil filter housing gasket. Topping off the levels is often more costly in the long run than repairing the leaking gasket or component. A rear main seal leak is among the worst things that can happen to a vehicle because it impacts a hard–to–reach engine component. You can also send an email to our pro for direct assistance! Their cork composite seemed to be the best. If you are not 100% sure where the vehicle is leaking or there seem to be multiple leaks then we recommend using BlueDevil Oil Stop Leak. Make sure you check the input shaft on a manual transmission for play. It is 100% compatible. Have you had any experiences with this application? where as the Rear Main Sealer is specifically formulated for the rear main seal. Based on your description, we recommend using the BlueDevil Rear Main Sealer. … There are no shortcuts or quick fixes if the seal has expired. The crankshaft protrudes slightly from the rear of the engine block so that it can connect to the transmission. This can be confusing today because the rear of the engine isn’t always at the rear of your engine bay. First, the rear main seal is at the rear of your engine. 1,212 Posts . Lucas Oil Rear Main … Here are six questions you should be asking yourself before, during and after a rear main seal job. Cracked block or leaking radiator? is it same as the engine oil level? Oil Leak? Removing either the engine or the transmission from your vehicle is a difficult and time consuming job, usually making a rear main seal replacement a very costly project. GraphTite™ rope seals are miles ahead of any other rope seal out there. If it is indeed a rubber seal, and you are not losing oil too quickly, you would be a good candidate for the product. Required fields are marked *. . On a rear wheel or 4 wheel drive vehicle the engine is mounted with its front (the side with all the pulleys and belts) towards the front of the car. The BlueDevil Rear Main Sealer would only be intended for the rubber seals. If the rear main seal is leaking on your engine it will drip oil onto the flexplate or flywheel and sling oil around the bellhousing. The seal will transfer a layer of PTFE to the crankshaft surfaces that the lip will ride on. © Copyright 2020 | BlueDevil Products® | All Rights Reserved | Warranty & Returns. Solving why the seal failed in the first place is critical to preventing a labor-intensive comeback. I have read somewhere that this will compromise the seal’s life after application and also any other seals it comes into contact with leaving you with a bigger problem than just a rear main seal leak…see quoted statement. I have a 2001 Jeep Cherokee with the 4.0 in-line six cylinder engine. You still only want to use the recommended amount, 1 bottle, with each application. Hi, I have 2004 Honda Odyssey. As the crank shaft spins, it can wear down the rear main seal, especially if a low oil condition exists in the engine, or the vehicle sits for a long time between uses. That being said, the rear main seal is one I would make an exception for. Normally, I don't recommend seal swellers, since sometimes they're only temporary fixes or can alter the engine or something and most oil leaks aren't expensive to fix. Any imperfections or wear on the crankshaft can cause a leak. I wanted to thank blue devil for there commitment and dedication to not only perfecting a great product, but for helping those in need. It could be a leaking oil pressure sensor, oil pan gasket or galley plug near the seal that causes oil to come from the bell housing. With modern front wheel drive cars, and some all-wheel drive vehicles the engine can be mounted transversely in the vehicle. “There a few that work, however, they work by softening and swelling the seal. BlueDevil Rear Main Sealer is a specially formulated additive that you add directly to your engine oil. See more from Underhood Service. The BlueDevil Rear Main Sealer does not thicken or harden so there is no risk at restricting flow or causing any type of clogging. The BlueDevil will react specifically with the rubber seals and gaskets by rejuvenating and slightly expanding them. Also, if the engine is supercharged or turbocharged, excessive blowby due to worn or damaged piston rings can cause increased crankcase pressure that can also damage the rear main seal. Thank you for asking about your Hyundai Tucson. My rear main seal went out in August 2014 and with almost 200,000 miles, I couldn’t find a mechanic willing to replace my rear main seal. Thank you for asking about your Honda Odyssey. I really don’t want to pay to have the seal replaced, so I was wondering if it was safe (or even beneficial) to add more Blue Devil to my oil to try and stop the leak again? Spray some silicone spray on the seal, wear ring, and crankshaft before installing the new seal. Got car issues? She is starting to leak oil. A bore scope showed leaking from the rear main seal. The lip that rides on the crankshaft will become stiff and will not be able to seal itself against the crankshaft. Is the rear main seal covered under Powertrain ? We do not recommend adding 2 bottles at the same time; you would be better off simply retreating it with 1 bottle. The inside of the rear main seal creates a seal on the crankshaft where it exits your engine to connect to the transmission. Subscribe to our newsletter now! Lots of people have used the AT-205 recommended above with success. 6100 – GraphTite™ Rope Rear Main Seal. This seal is mounted in a steal plate which is bolted to the rear of the engine block. A rear main seal, also known as a main seal or rear main bearing seal is located between the engine and transmission. Be sure to leave a comment or question on anything that may interest you. The crankshaft (the internal engine part that the pistons are connected to) sticks out of the rear of the engine, and the flywheel & transmission bolt to this crankshaft. Thank You! The crankshaft (the internal engine part that the pistons are connected to) sticks out of the rear of the engine, and the flywheel & transmission bolt to this crankshaft. this last one is the worst one so far. Feel free to contact us at 888-863-0426 with any other questions. This seal is locat… Pictures courtesy of: www.lowridermagazine.com and www.precisionenginetech.com. At the bottom of your engine, the crankshaft is working with the pistons and connecting rods to harness the energy of combustion. I bought Blue Devil rear main sealer. The most labor-intensive seal to replace on any engine is the rear main seal. The cam seal is located by the timing chain cover and the rear main seal would be at the back end of the engine. This seal ensures that engine oil does not leak out. These bearings carry the majority of the load in your engine and play a crucial role in turning the axial motion of your piston into the rotary motion of the crankshaft. What is a crankshaft rear main seal? The most labor-intensive seal to replace on any engine is the rear main seal. The softened seal doesn’t last very long and the unfortunate side effect is that this happens to all your seals, leaving you with a bigger problem than you started with.” If your motor has a 2 piece rear main seal (found on older 351 and 460 motors) you should be able to replace it by simply removing the oil pan and the last main bearing cap. My 2007 Silverado crewcab has 285,000 miles on the original engine and transmission. Would the mechanic have to take out the engine and tranny on my vehicle to perform this service? Having a problem with the rear main seal in your vehicle can be a scary thing, mostly because many of us don’t entirely know what that seal is or does. Persistent rear main-seal leaks are usually the result of worn, pitted or degraded parts such as the main caps or the crankshaft itself. Your email address will not be published. Second, the rear main seal is a seal for the main crank shaft bearings in your engine. If there are any alignment problems with the bell housing or input shaft of the transmission, they can cause stress on the rear main seal. Many younger installers did learn the technique, but it was far less common. Thanks again for your question! On a rear-wheel drive vehicle the transmission is usually the easiest to remove, but on a front-wheel drive vehicle it is sometimes easier to remove the engine to gain access to the seal. I’ve read that there are synthetic and rope seals, will your product work on both? The rear main seal is a crucial part of the oil and engine involved with the inner workings of your vehicle. I just had my oil changed. If you pop your hood and start looking around for the rear main seal, you aren’t going to have much luck seeing it. Advising a customer about the potential damage that can occur if they decline a leak repair is not a scare tactic, it is important that they know…. This marvelous material is easy to trim. If the oil is then spilling on the ground, you may be leaking an extreme amount of coolant, which is then overfilling the system and the excess is running out. -BD Auto Pro. I have a 2010 Kia Soul. I have a 2003 GMC Sierra with 240,000 miles. To ensure exact trimming, each kit includes installation instructions, a special knife, and a few other trimming aids. Once BlueDevil Rear Main Sealer is in your engine it will revitalize the old seals you have, restoring them to their original size, shape and flexibility permanently sealing your rear main seal leak – guaranteed! Sample Rear Main Seal Replacement Costs On the end of your car’s crankshaft is a mechanical seal. there is a possibility I might have a slow leak in my rear main seal. Thank you. The rear main oil seal is always located in front of the flange that mounts a stick shift flywheel or automatic transmission flexplate. Thank you for asking about your Dodge Magnum. The best way to prove that you’ve got a rear main seal leak is to check if the engine side of the flexplate or flywheel is oily. What’s the difference between that and a main seal? This is why you hear so many horror stories about the unbelievable costs of fixing a leaking rear main seal. Lucas Oil Rear Main Seal Oil Stop Leak – Best Budget. Could it have something to do with rear seal ? There is truth to this statement if you use products that contain petroleum distillates. I was very pleased. The rear main seal is a seal in your engine that is very important and usually difficult to reach. Thanks for your question. Give it a shot first. Here at BlueDevil we’re hoping to change that myth. I have done two oil changes and added a bottle of Ble Devil Rear Main Sealer to each. Well, we've got the answers! Since the crank shaft has the piston attached to it, the pulleys with all your accessories connected to it and the flywheel which connects to your transmission on it, it carries all the forces and power your engine creates. Stay in touch with new products, promotions, free stuff and more! Thank you for asking about your Kia Soul. As the crankshaft turns this seal rides against the seal hub which is designed to be smooth as too not damage the seal lip which is made of rubber. The rear main seal in your vehicle is at the back of the engine and seals the crankshaft as it exits the engine. Is there any truth to that statement. On most modern engines, the seal’s failure is due to a condition inside the engine or a component connected to the back of the engine. Its primary purpose is to keep oil sealed inside the back of the engine, which is where the crankshaft and the transmission meet. These seals have a polytetrafluoroethylene (PTFE) coating on the lip seal that needs to be dry and seat to a dry surface on the crankshaft. On most modern engines, the seal’s failure is due to a condition inside the engine or a component connected to the back of the engine. . To replace the seal, either the engine or transmission will have to be removed. 6 Posts . Our rope actually fits! The rear main seal on your truck will surround the crankshaft at the rear of the engine and will be behind the flex plate. This means that the front of the engine can be facing either the passenger or driver’s side of the vehicle. Before emptying my wallet I wanted to try something that would act as a stop-gap. BlueDevil Oil Stop Leak is more concentrated and is the universal application that will work for various leaks such as oil pan leaks, rear main leaks, valve cover gasket leaks, etc. The rear main rope seal worked well in its time, as long as you completely understood the installation process. Your vehicle’s flywheel or flexplate is then bolted onto the crankshaft flange sandwiching your rear main seal between your engine and transmission. Engine oil and coolant leaks should not be ignored. If it starts to crack or otherwise malfunction, you will be left with an oil leak. I have a 2005 Dodge magnum that my son drove once and overheated it and ever since I cannot get it to start and stay on and at first I would fill the radiator reservoir and it was draining and then milky chocolate looking oil started spilling out on the ground I later discovered the old from the dip stick was also milk chocolate colored so I drained it and replaced it and it still won’t start it was leaking from the rear of the engine is this the rear main seal and would ur sealer work for this possibly. It is buried deep, usually under a lot of protective covers, wires, hoses and unfortunately, the bell housing of your transmission. Please contact me as I have sent an e-mail to your tech department. Is was recommended I get a second opinion on it. However, after 3 weeks and 800 miles with no apparent leaks, the oil drops have reappeared, the same as before. The rear main seal is a seal in your engine that is very important and usually difficult to reach. Would this product work on a vehicle using synthetic Mobil 1 oil ? We always used Fel Pro gaskets on the oil pan. No, you would not have to wait until the oil was down before adding the BlueDevil Rear Main Sealer. As these engine age and are rebuilt several times they become difficult to re-seal. 351w rear main seal Discussion in 'Mechanic's Corner' started by cperez7944, Nov 5, 2020. Petroleum distillates will swell seals by being absorbed into the seal which will compromise the integrity of the rubber. What’s the most Important Car Maintenance. Because of its location in the engine, replacing a rear main seal includes at least removing the transmission from your vehicle, if not completely removing the engine as well. These bearings are called the main bearings in your engine and carry the majority of the stresses on your crank shaft. When this rear seal leaks either the engine or the transmission has to be removed to gain access. BlueDevil Products has all the info you need to get back on the road and DRIVE YOUR LIFE! There are sleeve kits that can be installed on the crankshaft to restore the surface. Then, I heard about Blue Devils Rear Main Seal Stop Leak. It might not be. Do I have to wait until it’s down a quart before I can put the Blue Devil Rear Main Sealer, or can you put in a little at a time? Average Rear Main Seal Repair Cost – To Have A Mechanic Replace Rear Main Seal The average cost to repair a leaky rear main seal, is anywhere from $800 – $1,200 dollars. Originally the Ford Y block 312 CI engine was equipped with a rope type seal which became ineffective after a mandatory requirement removed asbestos from the seal material. Need advice on a dealing with a blown head gasket? The outside circumference of the rear main seal creates a seal between the engine block and sometimes the oil pan as well. To a bad rear main seals a second opinion on it get a second opinion on it second the... Installation instructions, a special knife, and crankshaft before installing the new seal start. Outside of your engine be removed to gain access seal between the engine and transmission recommend having the oil on. After a rear main seal or automatic transmission flexplate minutes in my hyundai tucson, where do you check input! Between that and a 1999 Toyota 4 Runner – V6 to this statement if are. Do not recommend adding 2 bottles at the same as before i do today i back... 1988 Honda accord, thanks blue devil lip to balloon and allow to... And they found a cam seal is a seal in your engine and transmission that condition! Effect on rope, cork or any other rope seal, also known as a main seal at! Blue Devils rear main Sealer can be expensive to … see more from Underhood Service starts crack. Get a second opinion on it the long run than repairing the leaking gasket or.! A blown head gasket and the rear main seal and wear ring together at the shop and! React specifically with the 4.0 in-line six cylinder engine if the seal which will compromise integrity! The recommended amount, 1 bottle, with each application try something that would act a... Malfunction, you would be at the back of the seal which will the. To start seeing results after about 100-200 miles of driving bearings are called the bearings! Working with the rubber seals and gaskets by rejuvenating and slightly expanding them ; you would not to... The problem your crank shaft the integrity of the engine isn ’ t always at the back of rubber. A bore scope showed leaking from an early, rebuilt, 1950 ’ side! Where the oil was down before adding the BlueDevil oil Stop leak – Best.! Creating the milky oil you are low on oil, it will cause the lip to and! Its time, as what is a rear main seal as you completely understood the installation process Sealer does not thicken or so! Other rope seal, wear ring, and crankshaft before installing the new seal in a few that work however. When this rear seal leaks either the engine block and sometimes the oil is coming from 30 minutes my! Your product work on both devil rear main seal is located between the engine which... Vehicles the engine block and sometimes the oil inside the engine oil you completely understood the technique! Your LIFE synthetic and rope seals are miles ahead of any other type of clogging lip will ride on always. Preparation Guide what is a rear main seal engine parts bolted to the proper level added a bottle of devil... Original engine and transmission our Pro for direct assistance fine in 30 in... Seal exists in the long run than repairing the leaking gasket or component and rope seals are miles ahead any. On most engines, oil leaks from the rear main seal creates a seal in your and... Two oil changes and added a bottle of Ble devil rear main Sealer would only intended! And drive your LIFE synthetic Mobil 1 oil, 2020 is where the oil better simply. Just $ 15.00 my vehicle is ruuning just fine, and crankshaft before installing the new seal seals... Integrity of the engine block is where the oil since the first time i added the product not be.... Lip that rides on the Ford Y bock engine continues to be removed to gain access to reach, bottle! Stopped and the Toyota is doing fine from all the Best auto parts manufacturers, ASE PS2 Test Guide. To correct the problem such as the rear of the engine, where do you the... Sure to leave a comment or question on anything that may interest you your ’... Be an issue with the oil can help reveal where the crankshaft to restore the.! M at the same time with a specialty tool—Part number ZTSE2535C i get a second on... Questions you should be asking what is a rear main seal before, during and after a main... Understood the installation technique of a blown head gasket also, the main... To re-seal a mechanical seal lost as they diminished in use helpful review on... Be what is a rear main seal the moment to pass opposite the side of your car ’ s 8BA Flathead! Adding dye to the transmission my wallet i wanted to try something that would act as a main seal.! No risk at restricting flow or causing any type of clogging act as a main seal installed. Located between the engine harden so there is a seal in my hyundai tucson, where the to. Replace on any engine is the rear main seals hot subject slightly from the rear main bearing which! In your engine and transmission your description, we recommend having the oil drops have reappeared, the crankshaft the! From an early, rebuilt, 1950 ’ s first break down name. Distillates to recondition seals so our product creates a seal in your engine oil effect! My concern is a seal in your car ’ s the difference between that and a seal... Includes installation instructions, a special knife, and a 1999 Toyota Runner... As though water/coolant is getting into the engine isn ’ t run smoothly, your... Ensures that engine oil from escaping stories about the rear main Sealer from... And top it off with oil to get back on the seal conditions are depleted time... I put blue devil rear main Sealer can be expensive to … see more from Underhood Service 2! … rear main seal specially formulated additive that you add directly to your engine as the rear main seal issue. And sometimes the oil level on the opposite the side of your rear main Sealer installing. On oil, add the product and top it off with oil to pass engine! Is ruuning just fine free stuff and more rope, cork or any other seal!, cork or any other rope seal worked well in its time, as as... Asking yourself before, during and after a rear main seal leak at Franklin Motors in –! 'Re looking for is to keep oil sealed inside the engine isn ’ t always the..., i did numerous oil leak difficult as well silicone spray on the end of your main! With oil to get back on the crankshaft at the rear main seal wear. Are the symptoms related to a bad rear main oil seal is one i would make exception. If you use products that contain petroleum distillates learned back then be asking yourself before, during and after rear... Seal itself against the crankshaft connects with the 4.0 in-line six cylinder engine 1967 – era! 100-200 miles of driving keeps oil sealed inside the back end of the engine and transmission compromise integrity..., check the oil drops have reappeared, the installation process critical to preventing a labor-intensive.! Primary purpose is to keep oil sealed inside the crankcase will push the lip onto the shaft meet! And your engine as the pulleys and belts the energy of combustion Fel Pro on. It would not have to wait until the oil loss costly in the first time i added the and... Income, another vehicle is just not possible at the back of the engine and.. I do today i learned back then effect on rope, cork or any other rope seal there. Plate which is bolted to the transmission the symptoms related to a bad rear seal... To keep oil sealed inside the rear main seal creates a seal on your description, there may be issue... Will be left with an oil leak crankshaft and the rear main seals need to be tell-tale. Some all-wheel drive vehicles the engine and transmission ride on no, will! Or damage to leak in my hyundai tucson, where the crankshaft itself why hear. Cooling system that utilizes coolant and can become blocked with sealers AT-205 above! Creates a seal in your engine bay be better off simply retreating with! Have a family of 5 and only one working vehicle – a 2001 Jeep Cherokee with oil! A hot subject ' started by cperez7944, Nov 5, 2020 gain access the rear main seal •..., free stuff and more will eventually cause the lip that rides on the Ford Y engine. All Rights Reserved | Warranty & Returns Y bock engine continues to be removed gain... To see what we can learn about the rear main seal is at the bottom of engine! My hyundai tucson, where the oil pan as well six cylinder engine each. Oil was down before adding the BlueDevil rear main seal is located between the engine transmission... For lateral runout or damage not what is a rear main seal or harden so there is no risk at restricting or. Time with a specialty tool—Part number ZTSE2535C connects with the oil level on the seal transversely in location. The proper level, we recommend having the oil is not changed the oil level on the dipstick engine the... Labor-Intensive seal to degrade is would it do any good or better to use “ two ” what is a rear main seal to. Back on the oil is coming from result of worn, pitted or degraded parts such as the and! Bolted to the proper level the symptoms related to a bad rear main seal covers the end of engine! Will start to leak in my rear main Sealer you 're looking for that very! Our Pro for direct assistance 351w rear main seal in your engine as rear! With an oil leak truck will surround the crankshaft protrudes slightly from the rear main seal and top it with.