 Main bearing clearances? |
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| stugray |
 Jul 28 2012, 08:56 PM
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Advanced Member  Group: Members Posts: 3,825 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None  |
I am getting ready to put my short block together and I have what appears to be a fairly new crank.
Main bearing journals: 2.361. The bearings appear to be new unused STD-STD. When I put on the main bearing that goes directly beneath the cam gear dry and wiggle it I get ~4 thousandths "wiggle" when measured with a dial indicator stuck to the flywheel. Does that sound correct? Would that be considered two thousandths bearing clearance (2 on each side = 4)? Stu |
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| stugray |
Jul 29 2012, 11:03 AM
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Advanced Member Group: Members Posts: 3,825 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
The crank is bolted to the flywheel sitting on the bench vertical.
I put the magnetic base dial indicator on the flywheel and measure the total movement of the main bearing (opposite end of the crank) with the bearing dry. I dont have an inside micrometer to measure the bearing so this was just a sanity check. It seems a little more loose than normal, but it is very hard to judge. Of course once you put lube on the bearing and put it on it doesnt seem to have a lot of slop. Stu |
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Posts in this topic
stugray Main bearing clearances? Jul 28 2012, 08:56 PM
mrbubblehead
I am getting ready to put my short block together... Jul 28 2012, 09:14 PM stugray Yes I have heard of plastigauge, but you cannot us... Jul 28 2012, 09:58 PM
mrbubblehead
Yes I have heard of plastigauge, but you cannot u... Jul 28 2012, 09:59 PM stugray Bump.
Bolting halves together today.
Anyone else ... Jul 29 2012, 10:08 AM McMark I've never measured the rock but it's defi... Jul 29 2012, 10:11 AM Racer Chris
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When I put on the main bearing that goes dire... Jul 29 2012, 10:32 AM nathansnathan The crank journal should be between 2.3610 and 2.3... Jul 29 2012, 10:45 AM nathansnathan I've always taken my crankcase, crank, and fly... Jul 29 2012, 12:18 PM stugray
No I am measuring how much the bearing moves sid... Jul 29 2012, 01:26 PM sixnotfour :beer2: Jul 29 2012, 02:50 PM ldsgeek The only way to check the clearance on those beari... Jul 29 2012, 07:07 PM |
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