Re: Motor rebuild
The rear main is always a problem as there are several places for leaks to come from. I like the Burtz seal best. The bolts must be sealed, the cap/block parting surface, etc. I did my first pressurized Model A recently and had a massive leak from the outside of the aluminum slinger, the cap doesn't quite cover enough back there on the A. Model B's are easier but you must still be careful.
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