The Ford Barn

Mercury7 · 09-02-2014, 07:39 PM

I have a 1957 Ford Fairlane 500 with a 312c i Y Block
I had the original rope rear main seal replaced with the modern neoprene seal.
This did not stop my excessive rear main oil leak.
Any suggestions.

ford3 · 09-02-2014, 09:20 PM

did you replace or forget to replace the wood taper seals that go in the grove on the side of the main cap?

Blackpearleb434 · 09-04-2014, 04:02 AM

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I've use the new neoprene seal before and had the same problem with it leaking and yes it was installed the correct way around with the joins offset from the cap / block....but also bear in mind the 292 and the 312 seals are different, when I looked into it the neoprene seal (I called felpro direct) it was reported to be a hit and miss affair with experienced engine builders, I ended up using the hard type rope seal from a 308 chev motor which worked great.

09-02-2014, 07:39 PM	#1
Mercury7 Junior Member Join Date: Dec 2010 Posts: 2	Mercury7 I have a 1957 Ford Fairlane 500 with a 312c i Y Block I had the original rope rear main seal replaced with the modern neoprene seal. This did not stop my excessive rear main oil leak. Any suggestions.

09-02-2014, 09:20 PM	#2
ford3 Senior Member Join Date: Oct 2012 Location: oroville calif. Posts: 1,453	Re: Mercury7 did you replace or forget to replace the wood taper seals that go in the grove on the side of the main cap?

09-04-2014, 04:02 AM	#3
Blackpearleb434 Member Join Date: Jan 2014 Location: Belmont, Western Australia Posts: 71	Re: Mercury7 Sponsored Links (Register now to hide all advertisements) I've use the new neoprene seal before and had the same problem with it leaking and yes it was installed the correct way around with the joins offset from the cap / block....but also bear in mind the 292 and the 312 seals are different, when I looked into it the neoprene seal (I called felpro direct) it was reported to be a hit and miss affair with experienced engine builders, I ended up using the hard type rope seal from a 308 chev motor which worked great.