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Old 02-20-2020, 01:40 AM   #7
warrene
Member
 
Join Date: Nov 2019
Location: Milaca, MN
Posts: 30
Default Re: Main and rod bearing adjustment ?

I just finished mine, take the engine out by itself, then on a stand.
This is a trial & error thing, I lay the crank in, fit each main cap (grind the cap down on side of a new chop saw blade, works fine) until there is a good drag to it, then put in .001 shims, you want these bearing at about .001, babbitt will fit itself, you end up with snug bearings that last. Use modern OIL, forget the old 'book' junk.
I'm using 5W-20, same as my modern cars, this thinner oil passes down those oil tubes better, especially when cold, this is what ruined engines in the old days of heavy oil, picks up better with the rod dippers also.
I also put in a 'pressure' line to the center main, probably a good idea, I had the parts on hand.
Word to wise: Use modern 80-90 in tranny & rear, forget the 'book', modern lube is by far best.
Fit rod caps with crank on the bench, same drag & shims.

warrene
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