"Unless the engine rear oil seal is leaking, do not remove the 'half moon'
seal when rebuilding an engine. But, if it is leaking, then adjust it as
follows. Fit and finger tighten the 3 bolts so that the 'half moon' seal is
approximately level with the edge of the block. Fit the bearing cap and
totque down to 20 ft pounds. A '2 thou' feeler gauge should just slide in
on each side of the seal. Nip the 3 bolts up lightly. As the cap is
progressively torqued down the gap will lessen between the seal and the
cap. As a further aid to prevent leakage (particularly on worn seals) oil
the cranksahft slinger lightly and thinly apply Silastic to seal in the cap
and on the 'half moon'."
Quoted from the John Fowler article "Spridget Maintenance and Improvement
Hints"
As I mentioned in the previous post on this subject, there can be several
other factors that contribute to oil leaking from the rear of the engine. I
have several other precautions I take when assembling this area to insure
(as much as possible) that I don't have a leak in this area. They will all
contribute to your success or failure.
When I get a chance to document it all, I will add it to the web site.
Gerard
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