The Ford Barn

zoegrant · 02-06-2019, 10:39 PM

I am changing the rear main seal on my 1955 sedan with a 272 engine while it is still in the car.
I am using a black neoprene Fel-Pro 2 pc seal and the side seal will have nails.
I have read differing opinions on the use of RTV on the " BACK " of the two pc seal.....One article said no RTV on the back of the seal , just RTV where the two seal half`s meet and on the retainer where it comes in contact with the block and a little RTV in the side holes before pushing in the side seals and nails.
IS RTV NEEDED ON THE BACK SIDE ON THE TWO PC MAIN SEAL ?
Thanks'

KULTULZ · 02-07-2019, 01:29 AM

Read this and see if it helps -

http://forums.y-blocksforever.com/Topic139804-1.aspx

Hot Rod Reverend · 02-07-2019, 01:07 PM

having done a number of Y block rear main seals successfully, I have NEVER put RTV or any other sealant on the back side of the neoprene, two piece seal. No leaks.

Others may differ...

zoegrant · 02-07-2019, 02:59 PM

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Thanks for good info...

02-06-2019, 10:39 PM	#1
zoegrant Senior Member Join Date: Jun 2010 Location: tolland CT Posts: 773	Rear main seal on 272 engine I am changing the rear main seal on my 1955 sedan with a 272 engine while it is still in the car. I am using a black neoprene Fel-Pro 2 pc seal and the side seal will have nails. I have read differing opinions on the use of RTV on the " BACK " of the two pc seal.....One article said no RTV on the back of the seal , just RTV where the two seal half`s meet and on the retainer where it comes in contact with the block and a little RTV in the side holes before pushing in the side seals and nails. IS RTV NEEDED ON THE BACK SIDE ON THE TWO PC MAIN SEAL ? Thanks'

02-07-2019, 01:29 AM	#2
KULTULZ Senior Member Join Date: Aug 2012 Location: IN A 'GALAXIE' FAR FAR AWAY Posts: 6,466	Re: Rear main seal on 272 engine Read this and see if it helps - http://forums.y-blocksforever.com/Topic139804-1.aspx __________________ *** - WHY IS IT ... - ... that everything you buy in the grocery store is either wrapped in or contained in plastic but the government doesn't want you to carry it out in a plastic bag? WONDERING IN W(BY GOD)V ... DIAGNOSED CDO** - (OCD In Correct Alphabetical Order)

02-07-2019, 01:07 PM	#3
Hot Rod Reverend Senior Member Join Date: May 2010 Location: Lancaster, CA Posts: 916	Re: Rear main seal on 272 engine having done a number of Y block rear main seals successfully, I have NEVER put RTV or any other sealant on the back side of the neoprene, two piece seal. No leaks. Others may differ... __________________ Lancaster, California Visit hotrodreverend.com to view hundreds of pictures and videos of the build of the 1955 Ford Club Sedan!

02-07-2019, 02:59 PM	#4
zoegrant Senior Member Join Date: Jun 2010 Location: tolland CT Posts: 773	Re: Rear main seal on 272 engine Sponsored Links (Register now to hide all advertisements) Thanks for good info...