Re: Flywheel Housing Alignment
I went through 6 used housings before I found an true one,Ford did about 8 revisions in production,the best are late '31's,they have ribs on the outside along the bottom.An easy test for cracking is to balance it with one finger and whack it with a wrench,it should ring...if it clanks its cracked.
The reason its done is to insure crankshaft/transmission input shaft alignment,so the clutch disc fully and evenly contacts the flywheel on application.
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