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My1930ModelA · 05-22-2015, 08:19 PM

Just last week I adjusted mine as well, on my 38,000 mile 30 Town Sedan. All three mains were shimmed with .006" on each side and I had a knock at fast idle, and measured .003"+ with Plastigage on all three. Removing a .003" shim from each side of all three caps resulted in .002" clearance, and that is as far as I felt comfortable going on this original engine. I'll find out this weekend if the knock has disappeared.

05-22-2015, 08:19 PM	#13
My1930ModelA Member Join Date: Feb 2015 Location: New Philadelphia, Ohio Posts: 32	Re: shimming engine bearings Just last week I adjusted mine as well, on my 38,000 mile 30 Town Sedan. All three mains were shimmed with .006" on each side and I had a knock at fast idle, and measured .003"+ with Plastigage on all three. Removing a .003" shim from each side of all three caps resulted in .002" clearance, and that is as far as I felt comfortable going on this original engine. I'll find out this weekend if the knock has disappeared.