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Old 04-18-2020, 03:56 PM   #1
AndrewS13
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Join Date: Feb 2020
Location: Omaha, Nebraska
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Main Bearing Clearance Issue?

I'm doing a full rebuild of my sr20det. My crank had very minimal scoring, so I took it to the machine shop with the rest of my block and paid to have the crank micro polished and measured. The machine shop told me the crank was all within spec (less than 5000 miles on crank). Since the crank was within spec, I bought standard clevite bearing. However, my clearances are giant on my main bearings. The plastigage doesn't even get smushed (0.08 mm+ of clearance. My guess is close to 0.1mm). How is this possible if my crank is within spec? Do I need to take it back to the machine shop and have my crank remeasured for oversize bearings? Should I just buy bigger plastigage and find out what my clearances currently are? This is only my 2nd turbo engine rebuild.
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