Quote:
Originally Posted by 61K10
read the review and it say's common problem with msd dist. Like T-B chevy said get the Marine one if they fit the same.
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Any distributor with a tight seal on the shaft will get this..
As the air doesn't get pushed out the cap from the crankcase pressure.. that leaks into the housing with looser seals/bushings/bearings.
I have a vacuum hose on the vent of the cap and it goes to the air cleaner with a tiny hole in the connection ,, start engine and it sucks just enough air through the distributor.. ..
others add a small hole in the base, so air can flow through.. using foam from an ear phone (80/90's)type not ear buds) to filter the incoming air..
The MSd cap seals to well..
Most Marine distributors have this issue and why they coat the parts.. or made of s/s .. as the caps are sealed..
The one vent on the cap top isn't allowing air to flow.. It is there to keep moisture from collecting on the inside of the cap..