Posted by pburchett on October 25, 2019 at 16:00:05 from (12.182.196.81):
While rebuilding my ford 640 I replaced the rear main rope seal with a 2 piece neoprene seal. Instant leak. I tried different brands of seals but with the same results. The problem was that seal groove in the block was deeper than the seal. The block groove is 2mm deeper than the cap groove which was not detrimental to the rope seals. This allows oil to leak around the neoprene seal and block.
After some research I found that this was a common problem with the Ford Y-Block autos engines (312, 272 & 292 Ford engines) I spoke with 2 famous Y-Block engine builders (Ted Eaton and Don Hyde) and they told me it would be best to use the 2 piece neoprene seals and stay clear of the rope seals even if I went with the best rope seal (Best Gaskets). They had no solution to my problem as they machined their blocks to accept a dodge 318 seal which would not work with the tractor application. They both recalled a shim kit that was once available but could not recall anything further.
Can anyone comment on the seal grove shims? I am thinking I could manufacture a shim (metal, fiber) to take up the additional space in the block and then seal the shim and rear main seal to the block and cap with oil resistant RTV. Has anyone tried this or have any other suggestions?
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