Re: New Babbitt Mains - How Tight
Brent has the right advice. The bearings will get hot on the initial run and the babbett will expand to tighten up the clearance. The tight bearings will wear down the high spots. On cooling the clearance will loosen up again. This will repeat until the correct clearance is obtained. This is one advantage of poured bearings. The first run should be short, about 15 minutes, followed by longer runs. And not high speed or high load. Ford recommended 25 mph for breakin. I think it was 500 miles. Ford did an initial breakin of his engines using an electric motor to turn the engines.
Use the normal detergent multi grade oil for the breakin. Change the oil after 500 miles. The next change can be longer.
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Last edited by nkaminar; 10-27-2022 at 08:15 AM.
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