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Patrick L. · 09-20-2020, 01:06 PM

You added more shims to the crank bearings when the pistons were installed and the engine turned hard ?

The crank bearings shouldn't have more than .002" as far as I'm concerned. I've seen to many knock at .003". If just the crank is installed it should spin quite easily.

What clearance does the piston maker suggest ? .002" seems way too tight to me, but, its up to the manufacturer to set the spec. I'm an old .001" per inch of bore [ minimum] guy. I usually use more than that.

09-20-2020, 01:06 PM	#5
Patrick L. Senior Member Join Date: May 2010 Location: Largo Florida Posts: 7,225	Re: Hard turning with new pistons You added more shims to the crank bearings when the pistons were installed and the engine turned hard ? The crank bearings shouldn't have more than .002" as far as I'm concerned. I've seen to many knock at .003". If just the crank is installed it should spin quite easily. What clearance does the piston maker suggest ? .002" seems way too tight to me, but, its up to the manufacturer to set the spec. I'm an old .001" per inch of bore [ minimum] guy. I usually use more than that. Last edited by Patrick L.; 09-20-2020 at 02:02 PM.