Plastigauge mains?, how to? |
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Plastigauge mains?, how to? |
goose2 |
Feb 13 2006, 05:33 PM
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#1
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Senior Member Group: Members Posts: 976 Joined: 30-March 05 From: Eugene, Oregon Member No.: 3,847 Region Association: Pacific Northwest |
I'd like to do a dry run on my lower end assembly to check main bearing clearances with Plastigauge. I assume I can just bolt it up and torque it down using only the main bearing saddle bolts, with no sealant, to get a reading. It's a 3.0 six. Is this correct?
Thanks, Randy |
Jake Raby |
Feb 14 2006, 08:34 AM
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#2
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
Plasticgage is near impossible to use on mains....
If you want to know the true running clearances, install the mains and torque the case up. drag up a dial indicating bore gauge and measure the ID of the installed bearings. Then mike the crank and subtract the crank sizes from the main bore sizes and thats the true running clearance.. Yes it takes hours and yes every engine I build gets it done- BUT I'm with the Capn' and don't think most enthusiast need to worry about it..... A good test is to plop the crank into the case with all the bearings installed and lube the crank with 20 wt oil ONLY, none of that BS assembly lube... Then torque the case up and then rotate the crank using an inch pound dial indicating torque wrench. If it takes more tha 10" pounds to rotate the crank in the case, the clearances are too tight.. If it takes less than 5" pounds to rotate it, more than likely they are loose... Thats what doing it a few thousand times will teach you.. |
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