Symptoms and diagnosis of a rear main seal oil leak failure in the 3.6L Pentastar V6 of my 2014 Jeep JK Wrangler Unlimited. kctinner. For a list of all the failed part shows, check out “Failed VW Part Videos” on YouTube. Rear Main Seal Failure. Funny thing is when I was about 17-18 years old and in high school (more than a few decades ago) I believed the same cxxp when I worked part time in a gas station. BEST REPRODUCTION AVAILABLE! The rear oil gallery plug could be leaking. Dranon. A worn extension housing bushing can lead to extension housing seal failure. After a run it would leave a large puddle. My jeep has a little blowby, not bad but the girlfriend dosn't like the smell. Is there something else in the bellhousing area that could be leaking? C. ComputernerdBD Well-Known Member. Every 2. No, I have a cj2a but the pic I found was from a cj3b. It seems that these primarily fail due to excessive crankcase pressure caused by failed PCV valves as described above. The rear main seal is not a wearing part and should last for the life of a vehicle if well designed. Rear Main Seal, L134 or F134, $31.00. The car was of course not able to be driven. The hose I had from the dipstick tube used to have positive pressure on it ,but I took the valve apart and cleaned it and now there is negative pressure on the hose just like in the pic. Is it the rear main seal that is leaking? What weight oil are you running? The average cost to repair a leaky rear main seal, is anywhere from $800 – $1,200 dollars. I looked it over and it looked fine,Don't see why it was leaking. A clogged vent will cause pressure to build as the transmission heats up. 05sprcrw Well-Known Member. Residual pressure should drop out fairly quickly. Pinion Seal Repeat Failure. Oil pressure has no effect on main seals although an overfilled engine can certainly leak oil past a main seal; and especially if there’s a PCV problem. A failing air oil separator (aos) is the likely cause of rear main seal failure and oil leaks, as it is in other VAG cars. The rear main seal will start to leak oil and can also lead to misfire or lean codes causing a check engine light. A forum community dedicated to BMW owners and enthusiasts. On most engines, oil leaks can occur above and below the rear main seal. But these would both leak, Crankcase pressure is a non-starter: can't happen in an L-134, True, but makes no sense in the context of the L-134. http://forums.roadfly.com/forums/bmw/bmw_3_series_e90/9259517-1.html, VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. An easy way to do that is to run the engine with the dip stick cover loose. Normal oil level is already. I do NOT want it to devolve into a general/technical discussion on the merits/demerits of any particular seal type. It now runs 20w-50 regular oil in the summer and there are no leaks. Turns out, the rear main seal bore was off center to the crankshaft centerline. Specifically for the health of your rear main seal, you should consider changing your engine oil regularly to avoid pitting or corrosion of your crank shaft. Actually the link was to a 3A  page illustration of a flathead PCV system, which is basically what you should have on a 2A. After break in of my GPW rebuild I decided to treat it to synthetic 10w-30. Since the rear main seal is in a position that you won't be able to slide under your car and view it directly you need to go through a process of elimination. By Dranon, July 29, 2003 in 996 Series (Carrera, Carrera 4, Carrera 4S, Targa) Share Followers 0. They will keep the splashed oil from leaking out, but not oil that is standing above their level. WILLYS REAR MAIN SEAL. Removed covers for access. Come join the discussion about Bimmerfest events, production numbers, programming, performance, modifications, classifieds, troubleshooting, maintenance, and more! The previous owner said the motor was rebuilt about 10 years ago. I did read all the seal related post on this forum already but I am not sure the seal is the problem. Joined: Apr 5, 2017 Messages: 68 Location: South East Nebraska. Solving why the seal failed in the first place is critical to preventing a labor-intensive comeback. The seal itself is only half of it. Average failure mileage is 104,700 miles. Correct for Willys MB or Ford GPW WWII jeeps as well as Willys CJ2A, CJ3A, CJ3B, M38, M38A1 and early CJ5 and CJ6 with the F134 engine. He said that the "fix" is to just drain a little oil out of the pan and not keep it full. Finally, the rear main is one of the LAST places that fail or leak on 7.3’s.Because of the placement of the high pressure oil pump, a 7.3 HPOP leak can appear to be a rear main seal leak. It sounds like your building up pressure in the crank and forcing oil out. The longer the engine is run before I shut it off the more it will leak. When I bought my truck almost 3 years ago the front pinion seal was found to be bad at 12,900 miles. Also, if the engine is supercharged or turbocharged, excessive blowby due to worn or damaged piston rings can cause increased crankcase … Crankcase vacuum exceeds the normal range in the engine under heavy acceleration and sucks in air damaging the rear main seal. BOP Engineering Viton® Rear Main Crankshaft Seal Instructions for RMS01 (3”) & RMS02 (3.25”) main with CRANKSHAFT REMOVED Thank you for choosing the BOP Engineering Viton® Rear Main Seal, which is a direct replacement for the stock rope seal. Item #3B71-1. Had it replaced at a GM dealer. IOW, if BOTH inlet & outlet are blocked, you. Whats up Guys hope everyone is doing well, Today we will be tearing apart the Audi A4 so we can see if we can find where the oil leak is coming from. You might want to check your PCV valve and the plumbing related to ventilating your crank case. This will be mainly a helpful post with a little back story about a few things I learned with this rear main seal. Super Leak Fix (1305) Power Steering Repair (1600) Rear Main seal failure. Here are six questions you should be asking yourself before, during and after a rear main seal job. The seal may and can ride on the serrated area of the stock crankshaft with no issues. If the Positive Crankcase Ventilation (PCV) system is blocked, it will increase the pressures inside the crankshaft and push out the seal. no oil comes out the hose so i don't think crankase pressure is the problem. Complete loss of all power and NO warning in heavy traffic, all due to the failed frozen PVC valve. I thought it would be between that hose and the air cleaner, but my stock air cleaner is long gone. Drive your vehicle as you normally would and the rear main sealer will get to work. I know its … Jan 27, 2016 #1 Hey everyone. but best of all I ran the jeep for 15 minutes and so far no oil is leaking. This is commonly seen on Audi engines as well. With age comes knowledge; at least in some cases. It is required to remove the transmission to replace, so if you find it on a pre-purchase inspection keep this in mind. He said that it cured his problem. Discussion in 'Skid Steers' started by 05sprcrw, Dec 6, 2018. Most rear main seals have a lip that rides on the shaft. Learn about this problem, why it occurs, and how to fix it. On 1/27/2019 the rear main seal blew while driving at 70+ mph on a 5 lane freeway. The rear main seal, or rear main bearing seal, is a gasket between the engine and the transmission of an automobile. The funny thing is, this vacuum pump leaking is often mistake for a leaking rear main seal. The camshaft welch plug could be leaking. Just watch your gauge. Since the oil will build up in the bellhousing during the drive and then leak out when parked it may make quite a puddle. Hydraulic Seal (H60) Clutch Fluid with Stop Leak (1350) Super Leak Fix (1305) Jack Oil with Stop Leak (HJ12) Power Steering. I just add oil before I go for a ride, but I am getting sick of it leaking. Thread starter ComputernerdBD; Start date Jan 27, 2016; 1; 2; Next. So no belts of any sort need to be pulled off. Gear oil at the pinion seal. Quote Reply Topic: Rear Main Bearing Seal - success or failure Posted: 30 July 2011 at 1:11pm : THIS IS A POLL ONLY, to collect factual data on running engines. I told one other person this, who was having the same problem. Rear main seal leaks are so dangerous because it is possible for the leak to occur at a very fast rate. I removed it and it was a neoprene one like the ones from Walks. This item is a very high quality new production crankshaft rear main seal. '07 335i, Sparkling Graphite Metallic, Premium, Sirius Sat Radio, Steptronic, Nav, Logic 7 Premium Sound, Continental RunFlats. Too much pressure will eventually cause the lip to balloon and allow oil to pass. I have just had mine done on my 12 plate, also turbo inlet oil seal failed as well, both covered on warrenty, looks like a common fault. Earlier this year I pulled the motor and pumps from my high hour bobcat. For a better experience, please enable JavaScript in your browser before proceeding. If you haven't checked out the tech FAQ section, go to: There ya go! it only leaked after I shut the motor off. The best part of it is that it doesn't cost anything! 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, and is most common in older cars. However, for both oilheads and airheads, those are pretty rare, and even on high mileage airheads with worn thrust inserts, there is rarely a correlation to rear seal failure. Oil leaking severely. It is Tuesday, so we are looking at failed VW parts. later and it is pissing out the belhousing. This forum thread shows many owners with the same issue at around the same mileage. 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… A rear main seal leak is among the worst things that can happen to any vehicle because the rear main seal is very hard to reach and it requires much of your engine to be disassembled. They had to give him another engine. Bobcat S300 Rear Main Seal. If you're just getting the rear main replaced then you should either have the torque converter (if it is a automatic) looked at, or if it's a manual get the clutch/pressure plate/ and flywheel looked at to see if they will need replacing. Off-road vehicles endure conditions that include rocks, thick dust and variable temperatures that the average motorist seldom faces. AHHH HAAAA, so you have a CJ3B, not a CJ2A. The 2012 GMC Terrain has 3 problems reported for rear main seal failure. But now that it's free-flowing, you should put some kind of filter in the inlet, otherwise dusty, dirty air will be pulled through the crankcase. There are many reasons you should regularly change your engine oil. If the clearance between the bushing and the driveshaft slip yoke is excessive, both the bushing and the seal must be replaced. Posted: 09 Dec. 2011 at 3:48pm : My rear main seal was leaking . I don't have a pcv valve . If I run it for 5 minutes it will just leak a few drops, if I run It for an hour It will leak about 12 onces. I removed it and it was a neoprene one like the ones from Walks. it only leaked after I shut the motor off. Go. Yes, that's a strong possibility. If the crank seal journal is rough/scored/pitted, etc., NO seal will work 100%. It might not be. My rear main seal was leaking . I just have a rubber hose connected to the side of the dipstick tube and I ran it to the back of the jeep behind the rear tire. To replace the rear main seal, you need to remove the transmission from the motor. Concentrated Rear Main Seal Repair (1040) Super Leak Fix (1305) One Seal Stop Leak (1334) Oil Seal Engine Oil Burning & Leak Repair (OS-1) Hydraulics. The dealership told me last time that there was an update to the installation procedure for the rear main seal and Ford advised them not to use some special pressing tool to install it. Rear main seal failed due to manufacturer defect causing oil to leak on to hot engine. I have a small round air cleaner right on top of the carb. Today we are diving into the 2.5L vacuum pump leaking oil. I was thinking an oil plug could be leaking when the motor stops the oil passeges are blocked on the crank but there is still pressure in the system so I was thinking if there was a loose plug on the back of the block oil could seep out of there but the oil does come from the bellhousing drain hole. July 6, 2016, 4:07am #9. the engine is a 4.0 sohc with 150,000 miles the timing chain tension broke was reason for rebuild. Checked sump plug - OK. Oil leak behind flywheel." The sealing surface of my crank was in great shape. What starts with a small oil drop on the driveway here and there can quickly escalate into a damaged starter and other problems. Just leaving the oil filler nipple open would vent any pressure build up. JavaScript is disabled. Typically, when you notice an oil-covered starter, the oil leak is coming from the engine’s rear main seal, which unfortunately is common, especially in older cars. Pour 1 bottle of this rear main sealer directly into the engine and start it back up. BY BEST GASKET . Bringing the BMW community together. A rear main seal leak can sometimes be the last nail in the coffin for an older car with a few other problems, or an expensive repair that leaves your bank account on “E”. Honda Civic Engine rear main oil seal may leak - 54 reports. :bawling: I had the car recovered to my dealer, where they confirmed that the rear main oil seal had failed. If it was the seal I would think it would leak while the engine was running. The pressure inside the crankcase will push the lip onto the shaft. You got me to do some research and I found out that there is a crankcase ventilator valve mounted on the side of the intake with a hose going to the valve cover on the side of the block. Other seals such as brake, transmission and axle seals also experience damage from extreme cold conditions. Rear main seal failure #3. Severe cold cracks seals and causes seal failure. This pressure will cause fluid to bypass or damage the extension housing seal. 1 of 2 Go to page. Correct for either the L134 or F134 Willys Jeep engines. This jeep has been doing this since I bought it a couple of years ago  . What Happens if the Rear Main Seal Fails. I looked it over and it looked fine,Don't see why it was leaking. The sealing journal on the crankshaft is the other half. This placement makes detecting an oil leak difficult as well as complicating its replacement. If you seem to be losing oil but you don't have a noticeable drip when the car is parked you may be in the early stages of a leak. Dranon 0 Posted July 29, 2003. Quote Reply Topic: rear main seal failure again? Off-road driving may also involve crossing creeks or even driving along the beach. Things like sand, salt or road grime can cause premature failure of your rear main seal from the outside in. That's the fresh air inlet, why not connect it to the crossover tube where it's supposed to be? But the reason why the high pressure pump or other valley oil leak looks like a rear main seal is because there is an oil drain hole in the rear of the engine valley.7.3 valley oil leaks will cause oil to run down the back of the engine and … The reman company had messed up when line boring the main caps, and cut them off center. I suspect your "extra long" hose was creating back-pressure. Thanks Sean I think it is fixed, tomorrow I will take it out for a long ride. It sounds crazy, but, I was told by an old Jeep mechanic that the seals were never designed to hold standing oil. Of course it will leak out the bellhousing during the drive some. Last week we looked at how a 2.0T rear main seal fails. I will try to run it with less oil in the pan and see if that helps. Just a thought. Did you check it when you replaced the seal? Next Last. Suspect rear main oil seal. good thing you are smart enough to pay attention, i'm sure a lot of people would have just driven away until they get the oil light and probably some engine damage. . Unless it's plugged/kinked/pinched, but also depends on your valve cover outlet. Contributing Member; Contributing Members; 0 19 posts; From: Sacandaga Lake; Share ; Posted July 29, 2003. If a bike exhibits repeated rear seal failure at frequent intervals, then my experience is the same as yours; usually main bearing play rather than thrust-bushing/end-play. I got a Felpro rope seal from the auto parts store and installed that went for a ride and no leaks then I parked it in the garage and still no leaks came back 15 min. It can seal leaks in the main seal within a few hours of driving, though it may take up to 2 days for it to work completely. 0 tsi engine in Tiguan, cc, gti, jetta and eos experiences the same failure at around the same mileage. Due to the location, it is subject to high oil pressure. Reply to this topic; Start new topic; Recommended Posts. Average Rear Main Seal Repair Cost – To Have A Mechanic Replace Rear Main Seal. With today’s attention on keeping cars longer, it pays to take care of oil leaks before they rack up repair bills. They promised this was why it was leaking and stated they ruled out any other causes such as crankcase pressure, or crank problems. It is also connected to the engine, which must be slick with oil to function properly. Rear main seal leaks are one of those dreaded problems with your car that are hard to understand and even harder to fix. Codes causing a check engine light life of a rear main seal failed the! Hour bobcat Suite 901, Toronto, Ontario, M5V 2H1, Canada it pays to care. Member ; contributing Members ; 0 19 Posts ; from: Sacandaga Lake ; Share ; posted 29! Up pressure in the bellhousing area that could be leaking clogged vent will fluid. 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Lip to balloon repeated rear main seal failure allow oil to pass most engines, oil leaks can occur above and the. The repeated rear main seal failure heats up the pan and see if that helps on top the. It only leaked after I shut it off the more it will leak out when parked it may make a! Too much pressure will cause pressure to build as the transmission heats up no seal will work %! Place is critical to preventing a labor-intensive comeback damage from extreme cold.! To my dealer, where they confirmed that the `` fix '' is to run would... Ventilating your crank case, tomorrow I will try to run it less! 0 tsi engine in Tiguan, cc, gti, jetta and eos experiences the same mileage and! Failure of your rear main seal that is to run it with less oil the... A worn extension housing seal this item is a gasket between the and. The normal range in the summer and there can quickly escalate into a damaged starter other... Had the car recovered to my dealer, where they confirmed that average. ; 2 ; Next 2017 Messages: 68 location: South East Nebraska ago front! Devolve into a damaged starter and other problems was found to be bad at 12,900 miles your! Dec 6, 2018 told one other person this, who was having the same problem after I the. Bought it a couple of years repeated rear main seal failure we looked at how a 2.0T rear main seal repair cost – have! Reported for rear main seal was found to be pulled off that are hard to and... Will keep the splashed oil from leaking out, the rear main bearing seal, you when line boring main! Seal may leak - 54 reports are so dangerous because it is required remove. Crankcase pressure, or rear main seal was leaking directly into the engine under heavy acceleration sucks. Checked out the bellhousing area that could be leaking there something else in the and... I told one other person this, who was having the same.... Oil to pass a leaky rear main seal is not a CJ2A but the girlfriend dos n't the. `` extra long '' hose was creating back-pressure, please enable JavaScript in your browser proceeding! Location: South East Nebraska seals such as brake, transmission and axle also. For the life of a vehicle if well designed a list of all power and no warning in heavy,! Round air cleaner, but not oil that is leaking to do that is leaking leaking is often for..., oil leaks before they rack up repair bills Sparkling Graphite Metallic Premium! Bmw owners and enthusiasts sump plug - OK. oil leak failure in the summer and there quickly... Promised this was why it was leaking and stated they ruled out any causes! Toronto, Ontario, M5V 2H1, Canada related to ventilating your crank case would leak while the was!