2012 Mustang 5.0 Coyote Motor

SvtCobra0404

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Hey Guys, Just wondering when you guys measure your oil clearances for main and rod bearings do you plasti gauge or use a dial bore gauge and micrometer? Pros & cons? Just have a motor that had a bearing issue, and just had the crank grinded down .010” and wanted to check the clearance to make sure it’s over with the new bearings. Please if you guys got any input thanks.
 

clinton2003

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I would probably go with the most accurate way to measure you can.

BUT I dont know as much as my machinist, so I let him do all the shortblock stuff. Seems like you may be better off doing the same. :D
 

4VFTW

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Bore gauge is best but plasti gauge will work too. I assume the machinist listed the clearances on the build sheet. No problem verifying them with PG.
 

Silbult14

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If you really want to do this right you will first need really good quality accurate tools. Measure the outside diameter of each rod and main bearing journal on the crankshaft at 90 degree intervals for roundness and check the edges of each journal at the same 90 degree intervals for taper. They should be as perfectly round and free of taper as possible. .0001-.00015 from perfect is PROBABLY OK. Next using a dial bore gauge measure the inside diameter of each rod and main bearing using the same method. Subtract the crank journal dimensions from the bearing dimensions and you have your clearances. This is time consuming and tedious, but if you want it right this is the way to do it.
 

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