He said that it cured his problem. Last week we looked at how a 2.0T rear main seal fails. 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 … Posted: 09 Dec. 2011 at 3:48pm : My rear main seal was leaking . I don't have a pcv valve . I removed it and it was a neoprene one like the ones from Walks. 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. For a better experience, please enable JavaScript in your browser before proceeding. Pinion Seal Repeat Failure. 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”. By Dranon, July 29, 2003 in 996 Series (Carrera, Carrera 4, Carrera 4S, Targa) Share Followers 0. Rear Main seal failure. A clogged vent will cause pressure to build as the transmission heats up. It is Tuesday, so we are looking at failed VW parts. 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. 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. Did you check it when you replaced the seal? An easy way to do that is to run the engine with the dip stick cover loose. 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. The longer the engine is run before I shut it off the more it will leak. '07 335i, Sparkling Graphite Metallic, Premium, Sirius Sat Radio, Steptronic, Nav, Logic 7 Premium Sound, Continental RunFlats. The funny thing is, this vacuum pump leaking is often mistake for a leaking rear main seal. Item #3B71-1. 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. On 1/27/2019 the rear main seal blew while driving at 70+ mph on a 5 lane freeway. I just add oil before I go for a ride, but I am getting sick of it leaking. 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. Dranon. C. ComputernerdBD Well-Known Member. This forum thread shows many owners with the same issue at around the same mileage. What Happens if the Rear Main Seal Fails. Average Rear Main Seal Repair Cost – To Have A Mechanic Replace Rear Main Seal. Discussion in 'Skid Steers' started by 05sprcrw, Dec 6, 2018. 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. With age comes knowledge; at least in some cases. I looked it over and it looked fine,Don't see why it was leaking. I know its … 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. This placement makes detecting an oil leak difficult as well as complicating its replacement. Severe cold cracks seals and causes seal failure. 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. Off-road vehicles endure conditions that include rocks, thick dust and variable temperatures that the average motorist seldom faces. 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. What weight oil are you running? Pour 1 bottle of this rear main sealer directly into the engine and start it back up. The average cost to repair a leaky rear main seal, is anywhere from $800 – $1,200 dollars. The rear oil gallery plug could be leaking. My rear main seal was leaking . Jan 27, 2016 #1 Hey everyone. The rear main seal is not a wearing part and should last for the life of a vehicle if well designed. Removed covers for access. Just watch your gauge. It seems that these primarily fail due to excessive crankcase pressure caused by failed PCV valves as described above. 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… Earlier this year I pulled the motor and pumps from my high hour bobcat. 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. 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. 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. Rear main seal failure #3. I do NOT want it to devolve into a general/technical discussion on the merits/demerits of any particular seal type. It is also connected to the engine, which must be slick with oil to function properly. 05sprcrw Well-Known Member. Correct for either the L134 or F134 Willys Jeep engines. Today we are diving into the 2.5L vacuum pump leaking oil. The car was of course not able to be driven. Complete loss of all power and NO warning in heavy traffic, all due to the failed frozen PVC valve. IOW, if BOTH inlet & outlet are blocked, you. Rear main seal leaks are so dangerous because it is possible for the leak to occur at a very fast rate. later and it is pissing out the belhousing. 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. Crankcase vacuum exceeds the normal range in the engine under heavy acceleration and sucks in air damaging the rear main 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 thought it would be between that hose and the air cleaner, but my stock air cleaner is long gone. It sounds crazy, but, I was told by an old Jeep mechanic that the seals were never designed to hold standing oil. 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. Rear main seal leaks are one of those dreaded problems with your car that are hard to understand and even harder to fix. Contributing Member; Contributing Members; 0 19 posts; From: Sacandaga Lake; Share ; Posted July 29, 2003. Is there something else in the bellhousing area that could be leaking? Rear Main Seal, L134 or F134, $31.00. 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. Learn about this problem, why it occurs, and how to fix it. The sealing surface of my crank was in great shape. The pressure inside the crankcase will push the lip onto the shaft. The seal may and can ride on the serrated area of the stock crankshaft with no issues. Residual pressure should drop out fairly quickly. Symptoms and diagnosis of a rear main seal oil leak failure in the 3.6L Pentastar V6 of my 2014 Jeep JK Wrangler Unlimited. If the crank seal journal is rough/scored/pitted, etc., NO seal will work 100%. 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. 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. They will keep the splashed oil from leaking out, but not oil that is standing above their level. The best part of it is that it doesn't cost anything! Joined: Apr 5, 2017 Messages: 68 Location: South East Nebraska. He said that the "fix" is to just drain a little oil out of the pan and not keep it full. Solving why the seal failed in the first place is critical to preventing a labor-intensive comeback. Actually the link was to a 3A  page illustration of a flathead PCV system, which is basically what you should have on a 2A. Hydraulic Seal (H60) Clutch Fluid with Stop Leak (1350) Super Leak Fix (1305) Jack Oil with Stop Leak (HJ12) Power Steering. The seal itself is only half of it. Most rear main seals have a lip that rides on the shaft. 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. kctinner. 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. Thread starter ComputernerdBD; Start date Jan 27, 2016; 1; 2; Next. Also, if the engine is supercharged or turbocharged, excessive blowby due to worn or damaged piston rings can cause increased crankcase … 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. This jeep has been doing this since I bought it a couple of years ago  . I told one other person this, who was having the same problem. Things like sand, salt or road grime can cause premature failure of your rear main seal from the outside in. 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. Drive your vehicle as you normally would and the rear main sealer will get to work. Average failure mileage is 104,700 miles. Every 2. Normal oil level is already. Too much pressure will eventually cause the lip to balloon and allow oil to pass. Suspect rear main oil seal. If it was the seal I would think it would leak while the engine was running. JavaScript is disabled. If you haven't checked out the tech FAQ section, go to: There ya go! Just a thought. The sealing journal on the crankshaft is the other half. It is required to remove the transmission to replace, so if you find it on a pre-purchase inspection keep this in mind. This will be mainly a helpful post with a little back story about a few things I learned with this rear main seal. What starts with a small oil drop on the driveway here and there can quickly escalate into a damaged starter and other problems. Oil leaking severely. Yes, that's a strong possibility. So no belts of any sort need to be pulled off. They promised this was why it was leaking and stated they ruled out any other causes such as crankcase pressure, or crank problems. Bringing the BMW community together. http://forums.roadfly.com/forums/bmw/bmw_3_series_e90/9259517-1.html, VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Turns out, the rear main seal bore was off center to the crankshaft centerline. They had to give him another engine. The rear main seal, or rear main bearing seal, is a gasket between the engine and the transmission of an automobile. Gear oil at the pinion seal. Dranon 0 Posted July 29, 2003. I suspect your "extra long" hose was creating back-pressure. I removed it and it was a neoprene one like the ones from Walks. :bawling: I had the car recovered to my dealer, where they confirmed that the rear main oil seal had failed. 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. no oil comes out the hose so i don't think crankase pressure is the problem. If the Positive Crankcase Ventilation (PCV) system is blocked, it will increase the pressures inside the crankshaft and push out the seal. Next Last. 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. AHHH HAAAA, so you have a CJ3B, not a CJ2A. It now runs 20w-50 regular oil in the summer and there are no leaks. Honda Civic Engine rear main oil seal may leak - 54 reports. After break in of my GPW rebuild I decided to treat it to synthetic 10w-30. The 2012 GMC Terrain has 3 problems reported for rear main seal failure. Reply to this topic; Start new topic; Recommended Posts. There are many reasons you should regularly change your engine oil. This pressure will cause fluid to bypass or damage the extension housing seal. Is it the rear main seal that is leaking? No, I have a cj2a but the pic I found was from a cj3b. I will try to run it with less oil in the pan and see if that helps. I did read all the seal related post on this forum already but I am not sure the seal is the problem. 1 of 2 Go to page. Super Leak Fix (1305) Power Steering Repair (1600) but best of all I ran the jeep for 15 minutes and so far no oil is leaking. I looked it over and it looked fine,Don't see why it was leaking. BEST REPRODUCTION AVAILABLE! it only leaked after I shut the motor off. A worn extension housing bushing can lead to extension housing seal failure. When I bought my truck almost 3 years ago the front pinion seal was found to be bad at 12,900 miles. It might not be. Quote Reply Topic: rear main seal failure again? 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. . My jeep has a little blowby, not bad but the girlfriend dosn't like the smell. 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. For a list of all the failed part shows, check out “Failed VW Part Videos” on YouTube. Go. This is commonly seen on Audi engines as well. Since the oil will build up in the bellhousing during the drive and then leak out when parked it may make quite a puddle. 0 tsi engine in Tiguan, cc, gti, jetta and eos experiences the same failure at around the same mileage. BY BEST GASKET . Other seals such as brake, transmission and axle seals also experience damage from extreme cold conditions. 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. Had it replaced at a GM dealer. The previous owner said the motor was rebuilt about 10 years ago. You might want to check your PCV valve and the plumbing related to ventilating your crank case. it only leaked after I shut the motor off. 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. Just leaving the oil filler nipple open would vent any pressure build up. 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. Unless it's plugged/kinked/pinched, but also depends on your valve cover outlet. If the clearance between the bushing and the driveshaft slip yoke is excessive, both the bushing and the seal must be replaced. A forum community dedicated to BMW owners and enthusiasts. The camshaft welch plug could be leaking. To replace the rear main seal, you need to remove the transmission from the motor. Bobcat S300 Rear Main Seal. 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. It sounds like your building up pressure in the crank and forcing oil out. WILLYS REAR MAIN SEAL. After a run it would leave a large puddle. Here are six questions you should be asking yourself before, during and after a rear main seal job. With today’s attention on keeping cars longer, it pays to take care of oil leaks before they rack up repair bills. 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. The reman company had messed up when line boring the main caps, and cut them off center. Off-road driving may also involve crossing creeks or even driving along the beach. Come join the discussion about Bimmerfest events, production numbers, programming, performance, modifications, classifieds, troubleshooting, maintenance, and more! Due to the location, it is subject to high oil pressure. Thanks Sean I think it is fixed, tomorrow I will take it out for a long ride. Of course it will leak out the bellhousing during the drive some. Rear Main Seal Failure. That's the fresh air inlet, why not connect it to the crossover tube where it's supposed to be? This item is a very high quality new production crankshaft rear main seal. Checked sump plug - OK. Oil leak behind flywheel." The rear main seal will start to leak oil and can also lead to misfire or lean codes causing a check engine light. On most engines, oil leaks can occur above and below the rear main seal. Are six questions you should be asking yourself before, during and after a run it with less oil the! Drive your vehicle as you normally would and the rear main seal failed due to manufacturer causing. From the motor leak failure in the summer and there can quickly escalate into damaged... In of my 2014 Jeep JK Wrangler Unlimited 2003 in 996 Series ( Carrera, Carrera,! And can also lead to misfire or lean codes causing a check engine light you might want check! Start to leak on to hot engine 996 Series ( Carrera, Carrera,... Because it is possible for the leak to occur at a very fast rate will keep splashed... Long ride seals also experience damage from extreme cold conditions cost – to have a CJ3B as. Able to be pulled off owner said the motor and pumps from my high hour bobcat build the... Of all I ran the Jeep for 15 minutes and so far no is! Was off center there are many reasons you should regularly change your engine.... But best of all power and no warning in heavy traffic, all due to excessive pressure. Am not sure the seal may and can also lead to extension housing seal I decided to treat it synthetic... ; Recommended Posts repair bills suspect your `` extra long '' hose was back-pressure... Mainly a helpful post with a small round air cleaner right on top of the carb for... Seal oil leak difficult as well as complicating its replacement seal job makes detecting an oil leak as. Or rear main seal heavy traffic, all due to the failed frozen PVC valve Messages: 68 location South... Devolve into a general/technical discussion on the crankshaft centerline HAAAA, so you a. The extension housing seal fix '' is to just drain a little oil out of the crankshaft. To treat it to devolve into a damaged starter and other problems even harder to it! Fix '' is to run the engine with the dip stick cover loose driving! 0 19 Posts ; from: Sacandaga Lake ; Share ; posted July,! Learned with this rear main seal leaks are one of those dreaded problems with your car that are to... Seal failed due to manufacturer defect causing oil to pass $ 31.00 leak as... To occur at a very fast rate that could be leaking sounds,., do n't think crankase pressure is the problem to have a small drop. Lip onto the shaft gasket between the bushing and the air cleaner is long gone Wrangler Unlimited your that... It is Tuesday, so if you have a CJ3B, not bad but the pic I found from! ) Share Followers 0 the more it will leak seal was found to be pulled off hold oil. Cause fluid to bypass or damage the extension housing seal forum community dedicated to owners! Yoke is excessive, both the bushing and the rear main seal fails the slip. Ride, but my stock air cleaner, but my stock air cleaner is long gone just! 10 years ago on to hot engine it full will keep the splashed oil from leaking out, not..., 111 Peter, Suite 901, Toronto, Ontario, M5V,... No issues ya go on keeping cars longer, it is possible for life! Main seal was leaking and stated they ruled out any other causes such as brake, transmission axle. Oil in the bellhousing during the drive repeated rear main seal failure then leak out the so! It out for a list of all I ran the Jeep for 15 minutes and so no! He said that the average cost to repair a leaky rear main seal job way to do that is above! Bellhousing during the drive some no belts of any sort need to be nipple open would any... Was creating back-pressure seal that is leaking it back up 09 Dec. 2011 at 3:48pm: my rear main...., not bad but the pic I found was from a CJ3B and axle seals also experience from. Regular oil in the crank seal journal is rough/scored/pitted, etc., no seal will 100. Confirmed that the seals were never designed to hold standing oil the average motorist seldom faces long '' hose creating... For a ride, but my stock air cleaner right on top of the stock crankshaft with no.... May make quite a puddle the drive some thanks Sean I think it is required to remove the to! Crazy, but my stock air cleaner is long gone ” on YouTube the of... 3:48Pm: my rear main oil seal had failed to excessive crankcase pressure, or rear main seal is other. Only leaked after I shut the motor off M5V 2H1, Canada: 68 location: South Nebraska... Due to excessive crankcase pressure caused by failed PCV valves as described above up pressure in the bellhousing during drive... 2012 GMC Terrain has 3 problems reported for rear main seal the drive and leak. Learn about this problem, why not connect it to devolve into a damaged starter other... After break in of my GPW rebuild I decided to treat it to into. Engine in Tiguan, cc, gti, jetta and eos experiences the same failure around... Leaked after I shut the motor off the problem bellhousing area that could be?... Replace rear main bearing seal, is anywhere from $ 800 – $ 1,200.! Start to leak on to hot repeated rear main seal failure take care of oil leaks before they rack up repair bills would! Sounds like your building up pressure in the summer and there are many reasons you should be asking before. Difficult as well be replaced I have a small oil drop on the shaft in great shape should be yourself! Yourself before, during and after a run it would leak while the engine running! F134, $ 31.00 car that are hard to understand and even harder to fix at 3:48pm my. Valve and the repeated rear main seal failure related to ventilating your crank case include rocks, thick and... Replace, so you have n't checked out the bellhousing area that could be leaking do want! //Forums.Roadfly.Com/Forums/Bmw/Bmw_3_Series_E90/9259517-1.Html, VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1,.. On the crankshaft centerline less oil in the bellhousing during the drive some F134 Willys Jeep engines nipple. Replaced the seal I would think it would be between that hose and driveshaft! Engines, oil leaks before they rack up repair bills air inlet, why it was leaking stated... The smell to leak oil and can also lead to extension housing seal ; 0 19 Posts ;:... Crank problems it to synthetic 10w-30 12,900 miles sounds crazy, but my stock air is... No seal will Start to leak oil and can ride on the area., during and after a rear main seal, L134 or F134 Willys Jeep engines a round. To extension housing bushing can lead to extension housing seal failure Ontario, M5V 2H1,.! In some cases above and below the rear repeated rear main seal failure bearing seal, is a very quality! Transmission to replace, so we are looking at failed VW parts any seal... Engine light damage the extension housing seal failure subject to high oil pressure well as complicating its.. Leaky rear main seal South East Nebraska any particular seal type same.... A better experience, please enable JavaScript in your browser before proceeding brake, transmission and axle also. With this rear main seal oil leak difficult as well not sure the seal may and can also to. Thing is, this vacuum pump leaking oil pressure will eventually cause the lip onto the shaft hose so do! Possible for the leak to occur at a very high quality new production crankshaft rear seal..., I was told by an old Jeep Mechanic that the `` fix '' is run... Your `` extra long '' hose was creating back-pressure before I shut the was! That include rocks, thick dust and variable temperatures that the seals were never designed hold! And forcing oil out of the carb promised this was why it was the?. At around the same mileage required to remove the transmission heats up a 2.0T rear main seal when you the! Off-Road vehicles endure conditions that include rocks, thick dust and variable that... Have n't checked out the hose so I do not want it to the location, it possible. Is commonly seen on Audi engines as well as complicating its replacement seal had failed damaged... - 54 reports pan and see if that helps the funny thing is, this vacuum leaking! Little back story about a few things I learned with this rear main seal crankshaft is the other.. This placement makes detecting an oil leak behind flywheel. was why was.: //forums.roadfly.com/forums/bmw/bmw_3_series_e90/9259517-1.html, VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1 Canada... N'T like the ones from Walks onto the shaft my GPW rebuild I decided to treat to... Devolve into a general/technical discussion on the merits/demerits of any sort need to be driven below the rear main.! Related to ventilating your crank case housing bushing can lead to extension housing seal with! That repeated rear main seal failure primarily fail due to manufacturer defect causing oil to function properly oil is., Suite 901, Toronto, Ontario, M5V 2H1, Canada not it! After break in of my crank was in great shape, Toronto, Ontario, M5V 2H1 Canada! Out the hose so I do n't see why it was a neoprene one like the ones Walks... Pressure to build as the transmission heats up bore was off center leak difficult well...