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Dave in MN · 06-11-2019, 07:57 AM

IMO: A couple things could be causing your leak:
1) The rear main clearances are excessive
2) The rear main seal may not be installed with the proper sealant
3) The cap may not be set or machined correctly
a) The cap or mating surface my not be flat
b) The oil passage in the rear main cap may be restricted
c) If the engine has inserts, the thrust washers may have excessive gap between
them
The clue to your problem is the leak after shut down. The oil from the valve chamber is running down to and through the rear main faster than the drain system can remove it. This typically indicates a component in the rear main that has excessive clearance.
Good Day!

06-11-2019, 07:57 AM	#9
Dave in MN Senior Member Join Date: May 2010 Location: Jordan, MN Posts: 1,411	Re: Help rear main leak IMO: A couple things could be causing your leak: 1) The rear main clearances are excessive 2) The rear main seal may not be installed with the proper sealant 3) The cap may not be set or machined correctly a) The cap or mating surface my not be flat b) The oil passage in the rear main cap may be restricted c) If the engine has inserts, the thrust washers may have excessive gap between them The clue to your problem is the leak after shut down. The oil from the valve chamber is running down to and through the rear main faster than the drain system can remove it. This typically indicates a component in the rear main that has excessive clearance. Good Day!