Mercury7

[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.

 

[ford3]

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

 

[Blackpearleb434]

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.