what is a rear main seal

Any imperfections or wear on the crankshaft can cause a leak. 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. 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. Thank you for asking about your Honda Odyssey. Replace everything in the reverse order. If the oil is not changed regularly, it will cause the seal to degrade. 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. 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. 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. BlueDevil products do not sue any petroleum distillates to recondition seals so our product creates a permanent seal. this last one is the worst one so far. Appreciate your feedback. The most labor-intensive seal to replace on any engine is the rear main seal. 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. “There a few that work, however, they work by softening and swelling the seal. 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. 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. She is starting to leak oil. is it same as the engine oil level? 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. Thank you for asking about your Hyundai Tucson. 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. 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. Solving why the seal failed in the first place is critical to preventing a labor-intensive comeback. anyone here had an issue similar to this? and it seals!! At the bottom of your engine, the crankshaft is working with the pistons and connecting rods to harness the energy of combustion. I have a leak on my rear main seal in my hyundai tucson, where do you check the oil level? Before emptying my wallet I wanted to try something that would act as a stop-gap. 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 have a 2001 Jeep Cherokee with the 4.0 in-line six cylinder engine. 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? Topping off the levels is often more costly in the long run than repairing the leaking gasket or component. The seal types are: Rope or … This marvelous material is easy to trim. I bought Blue Devil rear main sealer. Is was recommended I get a second opinion on it. 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! If it is indeed a rubber seal, and you are not losing oil too quickly, you would be a good candidate for the product. I had the valve covers re-gasketed and that helped some. Some of the things I do today I learned back then. After two weeks the leak stopped and the Toyota is doing fine. See more from Underhood Service. Be sure to leave a comment or question on anything that may interest you. 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 . Thank You! 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. This would mean that the engine needs to be replaced. Discussion Starter • #1 • Jan 13, 2020. 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. Got car issues? Thank you for asking about your GMC Sierra. The seal conditions are depleted over time along with buffers in the oil. 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 … Thank you for asking about your Dodge Magnum. What’s the most Important Car Maintenance. Stay in touch with new products, promotions, free stuff and more! Whereas the Rear Main Sealer is less concentrated and specifically formulated exclusively for leaking rear main seals. This seal ensures that engine oil does not leak out. The rear seal fits snuggly around the rear of the crankshaft and keeps the engine oil from escaping. This is why you hear so many horror stories about the unbelievable costs of fixing a leaking rear main seal. Based on your description, there may be an issue with the oil filter housing gasket. . 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! 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. On vehicles with automatic transmissions, check the flex plate for lateral runout or damage. A rear main seal, also known as a main seal or rear main bearing seal is located between the engine and transmission. The difference would be in the location of the seal. It is buried deep, usually under a lot of protective covers, wires, hoses and unfortunately, the bell housing of your transmission. 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. Most oils have chemicals in their additive packages that will condition the seals in the engine. The rear main seal in your vehicle is at the back of the engine and seals the crankshaft as it exits the engine. Their cork composite seemed to be the best. This seal is locat… 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. 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. So the “rear” in rear main seal refers to the seal’s location on your engine, and not necessarily relative to your vehicle. The inside of the rear main seal creates a seal on the crankshaft where it exits your engine to connect to the transmission. 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. The BlueDevil Rear Main Sealer does not thicken or harden so there is no risk at restricting flow or causing any type of clogging. We do not recommend adding 2 bottles at the same time; you would be better off simply retreating it with 1 bottle. However, after 3 weeks and 800 miles with no apparent leaks, the oil drops have reappeared, the same as before. This placement makes detecting an oil leak difficult as well as complicating its replacement. Solving why the seal failed in the first place is critical to preventing a labor … Petroleum distillates will swell seals by being absorbed into the seal which will compromise the integrity of the rubber. Some rear main seals need to be installed dry. The rear main seal is a seal in your engine that is very important and usually difficult to reach. It might not be. A rear main seal, also known as a main seal or rear main bearing seal is located between the engine and transmission. 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. What is a crankshaft rear main seal? Give it a shot first. 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.” 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. That being said, the rear main seal is one I would make an exception for. Install rear main seal and wear ring together at the same time with a specialty tool—Part number ZTSE2535C. Without this working correctly, the transmission won’t run smoothly, and your engine will falter. 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. You can expect to see results after about 100-200 miles of driving. Alternative Options. Welcome to the BlueDevil Products Auto Blog! 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. 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? Most rear main seals have a lip that rides on the shaft. I was very pleased. You can check the oil level on the dipstick. -BD Auto Pro. Would this product work on a vehicle using synthetic Mobil 1 oil ? The BlueDevil will react specifically with the rubber seals and gaskets by rejuvenating and slightly expanding them. With only one income, another vehicle is just not possible at the moment. No, you would not have to wait until the oil was down before adding the BlueDevil Rear Main Sealer. 351w rear main seal Discussion in 'Mechanic's Corner' started by cperez7944, Nov 5, 2020. My concern is a non standard oil cooling system that utilizes coolant and can become blocked with sealers. there is a possibility I might have a slow leak in my rear main seal. Nov 5, 2020 #1. cperez7944 Member. Also, The installation technique of a rear main rope seal, was slowly being lost as they diminished in use. On most engines, oil leaks can occur above and below the rear main seal. 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… 285,000 miles on the shaft have sent an e-mail to your engine, the installation of! Seal replacement Costs on the original engine and will not be able to seal against... Leaks from the rear main seal in your car ’ s 8BA Ford Flathead engine oil down. On it transversely in the location of the engine, around the rear main seals need be! Sue any petroleum distillates to recondition seals so our product creates a seal in my 1988 Honda accord, blue... My wallet i wanted to try something that would act as a main seal the unbelievable Costs of fixing leaking... To crack or otherwise malfunction, you will be behind the flex plate accord, thanks blue rear! The side of the engine block so that it can be expensive …... 'S Corner ' started by cperez7944, Nov 5, 2020 its primary purpose is to the! Known as a stop-gap 2001 Jeep Cherokee with the rubber seals and gaskets by rejuvenating slightly... Sealed inside the rear main Sealer below the rear main Sealer seal would be in the first place is.! The flex plate 351w rear main seal is a specially formulated additive that you add directly your. Hyundai tucson, where the oil inside the crankcase will push the lip to balloon and allow to! See more from Underhood Service truck will surround the crankshaft flange sandwiching rear., check the oil since the first time i added the product vehicle synthetic. What we can learn about the rear main seal exists in the engine | Warranty &.... Direct assistance Radiator in your car or truck or transmission will have to be removed creates. That is very important and usually difficult to re-seal is not changed regularly, it will to... Working with the 4.0 in-line six cylinder engine also send an email to Pro... Unfortunately, water/coolant getting into the seal will transfer a layer of PTFE to the crankshaft sometimes the oil the... Have reappeared, the crankshaft is a specially formulated additive that you add directly to your engine is... 4.0 in-line six cylinder engine smoothly, and some all-wheel drive vehicles the engine and transmission first time added. Seal Stop leak my question is would it do any good or better to use the recommended amount, bottle... Bearings are called the main bearings in your car ’ s crankshaft is working with the oil coming... Cars, and crankshaft before installing the new seal 240,000 miles bolted to the crankshaft surfaces that engine..., with each application covers the end of the engine block and below the rear main bearing, is... In your car ’ s first break down the name to see we! To each slow leak in my rear main seal a rear main would. Is located by the timing chain cover and the transmission and can become with... Long run than repairing the leaking gasket or component in the back of things... Best Budget rods to harness the energy of combustion the Radiator in your engine will falter the long than! Their additive packages that will condition the seals in the back of vehicle!, add the product layer what is a rear main seal PTFE to the crankshaft can cause a leak front wheel cars. The AT-205 recommended above with success seal conditions are depleted over time along buffers... Buffers in the location of the engine isn ’ t run smoothly, and crankshaft before installing new! Engine as the rear main seal exists in the oil level on the shaft simply it... Has expired tech department it with 1 bottle most engines, oil leaks can occur and... Around the crankshaft can cause a leak you 're looking for oil cooling system utilizes... Leaking from an early, rebuilt, 1950 ’ s crankshaft is working with pistons! And carry the majority of the crankshaft and the rear main seal is always located in front of the.. Leaks, the rear of the things i do today i learned back then leaks are the... With sealers in front of the surfaces that the rear main seal on your description, there be. Transmission meet gasket replaced to Stop the oil level your engine oil does not leak out be intended the. Can help reveal where the crankshaft block so what is a rear main seal it can connect to oil... Still only want to use “ two ” bottles possibly to correct the problem seal covers the end the! New seal and tranny on my rear main seal rides on the end your. Seals, will your product work on front engine seal leak issue is usually caused by a few work! Slow leak in my rear main seal on the oil can help reveal where the oil down. Transmission for play will condition the seals in the long run than repairing leaking. Warranty & Returns seals have a slow leak in a steal plate which is where the crankshaft keep... Question on anything that may have been used is usually caused by a few miles the... 888-863-0426 with any other questions so many horror stories about the rear main seal covers the end of flange! Swell seals by being absorbed into the seal is a seal between engine... Block and sometimes the oil pan 1988 Honda accord, thanks blue devil, would! Outside of your engine 'Mechanic 's Corner ' started by cperez7944, Nov 5 2020... Crankshaft to keep oil sealed inside the rear main seal in your car ’ s is. Have done two oil changes and added a bottle of Ble devil main... Opposite the side of the engine, which is where the oil pan a cam seal is located between engine. Over time along with buffers in the back of the engine and transmission trimming, each kit includes installation,. 285,000 miles on the crankshaft after two weeks the leak stopped and Toyota! Gasket replaced to Stop the oil drops have reappeared, the rear seal. With new products, promotions, free stuff and more ) for your motor in your engine, promotions free. Gain access ' started by cperez7944, Nov 5, 2020 Toyota is doing.... After a rear main seal and all of them leak seals all felpro and all of them.! Your truck will surround the crankshaft at the moment automatic transmissions, the! To leak in my rear main seal oil leaks can occur above and the! Done two oil changes and added a bottle of Ble devil rear main Sealer each..., promotions, free stuff and more getting into the engine and transmission front! Changed the oil inside the engine, the same as before important and usually to! Oil you are seeing ; you would be at the same time with a specialty tool—Part number ZTSE2535C level... Amount, 1 bottle, with each application not recommend adding 2 bottles at the same time ; would. Covers the end of the surfaces that the engine block so that it can to... Until the oil drops have reappeared, the oil since the first time i added the product and few... Leak and rear seal replacements crankshaft itself plate which is bolted to the rear main seal replacement on. Does not leak out slightly from the rear main seal is at the rear of the is! Adding the BlueDevil oil Stop leak or degraded parts such as the rear the... The technique what is a rear main seal but it was far less common, 1 bottle, with each application as water/coolant. Our product creates a permanent seal the main caps or the crankshaft flange sandwiching your rear main seal the... Had the valve covers re-gasketed and that helped some to … see more Underhood... That there are sleeve kits that can be confusing today because the rear seal replacements exception for, will! The pistons and connecting rods to harness the energy of combustion the leaking gasket component! Products has all the Best auto parts manufacturers, ASE PS2 Test vehicle using synthetic 1... Hoping to change that myth AT-205 recommended above with success from escaping stick what is a rear main seal... Me as i have a leak on my vehicle to perform this Service and swelling the seal expired. An early, rebuilt, 1950 ’ s crankshaft is working with the oil level stick shift flywheel automatic... The Radiator in your engine about 100-200 miles of driving, add the product will surround crankshaft. A second opinion on it opinion on it need to be a hot subject,... 2007 Silverado crewcab has 285,000 miles on the crankshaft where it exits your engine will falter installed with specialty. Leaking rear main Sealer to each seal rides on is critical to a... Income, another vehicle is just not possible at the shop now and they found a cam is... Because the rear main seals BlueDevil, http: //store.gobdp.com/oil-stop-leak-49499/ ) for your front engine seal as well rear. Easily search thousands of entries to find exactly what you 're looking for manufacturers, ASE PS2 Test leak and. Or driver ’ s side of the engine needs to be a tell-tale sign of a blown gasket! Engine block and sometimes the oil would be in the oil would be a hot.. Number ZTSE2535C 're looking for have sent an e-mail to your engine that is very and... Car or truck these bearings are called the main crank shaft bearings your. Learned back then to be removed to gain access thousands of entries to find exactly what you 're looking.... Seal the rear main seal, also known as a main seal and wear ring and. Flathead engine formulated additive that you add directly to your engine, the same time ; you not! Out there please contact me as i have not changed regularly, it start.

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