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Old 10-19-2020, 10:27 AM   #11
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Join Date: Apr 2018
Location: Mebane NC
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Default Re: Time lapse Model A engine build

Originally Posted by BRENT in 10-uh-C View Post
Originally when Ford authorized shops did the rebuild, they used a large burnishing machine to 'fluidize' the cast bearing material so it would conform to the journal pins. Fast forwarding to modern-era rebuilders, most must compete on a price-point which does not allow the extra time for them to burnish bearings. The alternatives at that point are to set them bearing clearance up looser so the starter can rotate the engine, or set the clearances tighter requiring mechanical assisted starting until the engine has self-burnished the bearing.
Is the crankshaft hard enough to serve as an adequate substitute for the OEM roller burnishing?
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