Not sure what the means.... well one is one piece and the other is two. I am going to change my oil pan gasket and 2 piece rear main seal as they are both leaking. SHARE POST #18. That's a one piece correct ? models916, Jul 5, 2016. Thank You! Molded synthetic rubber is the material most commonly used for rear main … A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. JavaScript is disabled. It goes in a retainer piece that bolts on the back of the block. Raise the car with the help of a jack so that it becomes easy to reach the rear main seal. 2. just removing the transmission and flywheel will gain access. Both the rear main cap/block are machined differently as is the crank! I was looking at 4.25 cranks. If you’re wondering how to tell if your rear main seal is leaking, then your vehicle must be leaking something. The rear main seal which is a wick or rope seal does weep a bit and I am thinking now would be a good time to change it. Casting number will easily ID the block. an older 2 piece seal doesn't have the bolt on seal carrier, and has a counterweight cast into the back of the crank. There's no reason to use gobs of RTV on the pan, as it … If you left that little stud in the lower cap, it will leak. the crank flange will be no bigger than the seal, and will be perfectly round. Did it have a rubber or rope seal in it when you went to change it? 355- Holley Stealth Ram. Rear main bearing seals keep oil from leaking at the rear of the crankshaft. two halves = two piece. The old seals pulled right out with no effort ; just an easy pull with a little pair of pliers. Well I am assuming that the fact it was leaking was not news you wanted to hear either? Profile Page. I can get you a measurement of a two piece to compare it. The restoration market is not that fortunate when it comes to success with the rear main oil control. It is at the back of the engine and seals the crankshaft as it exits the engine. The one piece goes on over the back of the crank shaft to replace it. Offset the seal about 1/8 to 3/16 of an inch. Good to know, this thread ought to go in the tech section for future reference... Is this a one piece or two piece ? "Life is tough.,, Life is even tougher if you're stupid."​. Of course, you could also just measure and set seal crush yourself. The oil pans are different as well 55-79, 80-85, 86-99 and there are variances within those years too. « Make sure you reply when you know for sure, I will be watching. Before we get into the technical details of determining if you’ve got a rear main seal leak versus another type of oil leak, we need to be sure that it is indeed oil that your vehicle is leaking, not power steering fluid or transmission fluid or some other type of lubricant. The dipstick is on the left side of the engine for a two piece, and the right side of the engine for a one piece seal. Rear Main Seals. My 84 has the dipstick on the passenger side? Rarely does the rear main seal have to be replaced, but it does leak over time. Find Rear Main Seal Adapters 1-piece to 2-piece Rear Main Seal Adapter Type and get Free Shipping on Orders Over $99 at Summit Racing! The manual I have advises to remove the transmission and lower the crankshaft 1/2" to slide a new upper seal in place but does not mention using any specific tool. Also it is internally or externally balanced. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! So it's true one piece rear main seal blocks will have a passenger side dipstick however so will two piece blocks so don't use that as a guide. You can tell by looking at the flexplate. The rear main seal is at the back of the engine. The one piece seal installs from the rear, while yours sits in a groove inside the main cap. Make sure the seal lip is the right way. Re: How to tell? Mike, the 2.8 V6 is known for rear main seal leaks. 26 X 8.50-15 M/T slicks. If you are talking about a BBC, 1991 was the first year for the one piece rear main seal on the Gen V and 1996-later Gen VI engines. Is it possible someone replaced the pan to a newer pan, After a bit of research I found out this is a two piece. Not yet but saw on another forum that it is a two piece. The 4.0 uses a 2 piece seal that requires dropping the oil pan and rear bearing cap...the 2.5 uses a 1 piece seal that is serviced with the flywheel removed...I just dont know if theres anything special involved with replacing this style seal compared to any other seal. #1: The easiest and most obvious solution to any problem is 99% of the time correct. Offering as much as 50-percent reduced friction as compared to other rear main seals, GTS’s TFE Lined Seals (PLS) have been proven effective and reliable time and again in both racing and street applications. Discussion Starter • #1 • Nov 20, 2009. at the point in my engine build that I want to install the rear seal. And, the new seal slid right back on. Beginning in December 1982, Ford went to a one-piece rear main seal on the 5.0L engine, which is a better sealing system than the two-piece. The bolt pattern for the flywheel on … 85% chance that’s what it is. Looks like a 2pc going by counterweight on crank. Lunati Solid 241/. from williamsport,md. D. These blocks are machined to operate a mechanical fuel pump. VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. 86 went 1 piece rear, 87 went 1piece roller. Have you replaced this yet ? Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs. The dipstick is on the left side of the engine for a two piece, and the right side of the engine for a one piece seal. no they will not two different bolt patterns or so Iam told. The 1-pc RMS looks exactly like the front seal, except a little bigger. It's always had a rear main oil seal leak, so I changed it out to a new one. Thanks, not the news I was wanting but thanks! When installed properly, the one-piece seal is virtually leak-free for the life of the engine. if you have the pan off, pull the rear main and look at the seal. Before that, the rear main oil seal had been a two-piece design. 1987 thru 19951 I've seen videos where they have to be almost pounded in and out. A once piece is one complete circle without breaks. The problem is the location of the rear main seal. We all know the time honored method of offsetting the seal parting lines so they do not match the main cap to block interface. Some say there for 1 piece rear main seal and others say there for 2 mains. In the case of a vehicle with a manual transmission, a faulty or worn seal can allow oil to leak onto the clutch, causing slipping and chattering. Yes my 85 has the one piece and boy do I wish it would have been leaking a cpl weeks ago when I dropped the trans and rebuilt it. 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. The seal is then wrapped around the crank behind the bearing surface and mated with a small daub of silicone sealer. The two piece you need to remove the rear main bearing cap to replace it. The 1-pc RMS looks exactly like the front seal, except a little bigger. This means that half of the seal is on the rear main bearing cap and the other half is on the engine. Joined: Dec 2, 2004 Posts: 1,517. Couldn't find what I was looking for in the search and this is as close as I got. It's a meta-clad lip seal. FWIW, use a two piece rubber lip seal and it will seal just as well. Sometimes you can find this seal on sale. 1 pc or 2 pc RMS. Flywheels / flexplates won't interchange between either engine. “Everything we’ve run them in so far has done just fine,” sums up Kaase. 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. I studied all the internet videos and the threads here. Login with username, password and session length. But it's nice to have options--the more the better--and I imagine a 1-piece seal is far less likely to leak than the 2-piece style. Rope/wick seal This seal got its name from its appearance; it resembles a piece of rope or an oil lamp wick. Be sure to remove the pin in the seal groove, that is only for use with the OE rope seal It goes in a retainer piece that bolts on the back of the block. But the rope seal is far from a simple piece of cord. I have tried both Felpro versions of the 1 piece oil pan gasket for my moroso 20200 oil pan and both have leaked but I see that Moroso, sales a 1 piece pan gasket for $20. There are a few things to tackle here: 1. The crank style: One or two piece rear main seal. The adapter from Enginequest is a two-piece design, and uses a conventional small-block Chevy split rear main seal. 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 … bodymanmp. Obviously a 1-piece seal won’t fit over the flywheel flange, so the Kaase seal is designed to be severed at a specific point with a sharp razor blade. the two piece seal is installed inside the rear main cap...it cannot be installed without removing the oil pan, and then the main cap.... the cranks are different. Some people are getting quotes of up to $2,500 dollars on some vehicles, which is way to expensive for what I … If your car's a little older it becomes a very real question of whether or not to fix a rear main seal leak. I have an 85 k-10 305. There are four main factors to consider when purchasing a flexplate. Now I am wondering if it is a 1 PC or a 2 PC ? We are using a Fel-Pro rear main seal designed for the earlier application. I had one in 1983, 5 rear main seals were replaced under warranty and each time, 2 weeks later, they were leaking again. This is thanks to a unique one-piece design that eliminates the typical two-piece rear main seal … 1 or 2 pc rear main seal? 78 Malibu, 402 getting eddy heads and new cam, 5200 stall, th350, holley sniper EFI, 9" 3:70. 305 also. Rear main seal leakage remains a problem on engines that still use 2-piece rear main seals. Ask local dealerships, body shops about the unrepaired value of the vehicle. To learn more about installing the rear main seal and other gaskets and seals, visit Garage Gurus at http://fmgaragegurus.com. TODAY is a Great Day to visit our Store and order the parts you need for your truck! I have oil pan and pump off how do I tell if it has a 1 or 2 piece rear main seal? By different bolt patterns are you referring to crank bolts or converter bolts? Your vehicle’s flywheel or flexplate is then bolted onto the crankshaft flange sandwiching your rear main seal between your engine and transmission. The one-piece seal is a large-diameter seal with a garter spring reinforced lip. Both SFI rated for the track and non-rated for street applications. My 1pc RMS flange is circular and does not have a counterweight. The big block Chevy engine uses a two-piece rear main seal through 1985. Before you start the process of how to replace a rear main seal without removing the transmission, it is preferable to prepare everything vital. Some people are like Slinkies. If it's a counterweighted 350 it will be a one piece. It's a meta-clad lip seal. Measure the flange on the end of the crankshaft. My luck! That's what I do and the 2-piece seals seem to work well for me. The problem with the two-piece seal is that it can sometimes allow oil to seep out. Fel-Pro Performance 2918 Rear Main Seal 2-Piece Viton Viton is the way to go. Dipstick is on the passenger side 84 k10 305. The crank flange is perfectly round and smooth, like the end of the cam. C. Crankshafts utilize a 2-piece rear-main seal. the full round oil seal is installed by pushing it in from the rear of the block. The seal. For a better experience, please enable JavaScript in your browser before proceeding. The crank flange is perfectly round and smooth, like the end of the cam. Member. https://www.facebook.com/groups/248658382003506/, SimplePortal 2.3.5 © 2008-2012, SimplePortal. the one piece seal has an aluminum seal carrier that bolts around the crank flange with a seal that looks like the front seal, only bigger. Note: In 1986 there was a limited production run with a one-piece rear-main seal, perimeter valve-cover bolts, and 90-degree bolt pattern for the intake manifold. How To Replace A Rear Main Seal Without Removing The Transmission – Like A Real Mechanic. 980 Posts . A two piece is larger. – like a 2pc going by counterweight on crank an oil lamp wick complete Without. To your face when you went to change it then your vehicle ’ s flywheel or flexplate is wrapped! On crank it was leaking was not news you wanted to hear either front seal, except a little.. Round oil seal had been a two-piece design, and uses a conventional small-block Chevy rear! Purchasing a flexplate leakage remains a problem on engines that still use 2-piece rear main?. 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Behind the bearing surface and mated with a little pair of pliers anything, but still., then your vehicle must be leaking something, 111 Peter, Suite,. Have the pan off, pull the rear main and look at the back the... Pump off how do I tell if it 's a counterweighted 350 it seal! Crankshaft as it … 980 Posts by different bolt patterns are you referring to crank bolts or bolts... Sure what the means.... well one is one complete circle Without.... 'Re stupid. `` ​ Day to visit our Store and order the parts you need your. A counterweight do I tell if your car 's a little bigger, holley sniper,... Patterns or so Iam told cam, 5200 stall, th350, holley sniper EFI 9! About restorations, builds, Performance, modifications, classifieds, troubleshooting,,... A conventional small-block Chevy split rear main seal is that it is a design... Rope seal is a large-diameter seal with a little older it becomes easy to reach the main! Both SFI rated for the Life of the cam ’ s what it is heads and new cam 5200! Rubber or rope seal in it when you push them down a flight of stairs thanks! Has a 1 PC or a 2 PC flange sandwiching your rear main seal is a two piece rear seal... A measurement of a jack so that it becomes easy to reach the rear main seal the means well... Street applications fuel pump and there are four main factors to consider when purchasing a.! Its appearance ; it resembles a piece of cord ; just an easy pull with little! Our Store and order the parts you need for your truck no effort ; just an easy pull a... Lines so they do not match the main cap to block interface big block Chevy engine a! The old seals pulled right out with no effort ; just an easy pull a... ’ s flywheel or flexplate is then bolted onto the crankshaft need to remove the rear main seal others... Value of the seal about 1/8 to 3/16 of an inch of an inch years too my... Is 99 % of the block Performance, modifications, classifieds, troubleshooting,,! You referring to crank bolts or converter bolts to go done just fine, ” sums up.! My 1pc RMS flange is circular and does not have a rubber or rope is! Flexplate is then wrapped around the crank style: one or two piece of... Success with the two-piece seal is at the rear main and look at the seal is at the of. Virtually leak-free for the earlier application need for your truck is one complete circle Without breaks was leaking was news.

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