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Post by Strangeleak on Oct 31, 2009 8:45:50 GMT -5
...what are the tolerances of the crank and rod journals?
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Post by merc460 on Oct 31, 2009 17:47:11 GMT -5
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Post by Matt Culpepper 2300gearjammer on Nov 1, 2009 15:56:01 GMT -5
Dont put a tremendous amount of faith in plastigage unless its a basic rebuild. I would also measure journal diameters as well so you get size, taper and out of round.
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Post by Strangeleak on Nov 3, 2009 8:41:03 GMT -5
I only plan on making 250hp out of this build. Would you consider that a "basic rebuild"?
My crank is currently at the machine shop, I'm waiting for them to bring it back to me (I work at a repair shop and they pick/drop-off for us), but he said everything measured out just fine and he's going to send a polishing belt and other supplies back with it so I can clean up the journal faces at home.
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Post by Matt Culpepper 2300gearjammer on Nov 3, 2009 11:54:03 GMT -5
That sounds good. By "basic rebuild", I meant using factory parts and replace the wear items.
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Post by Strangeleak on Nov 4, 2009 8:11:27 GMT -5
Ok, cool. Now please excuse my ignorance, but the link that Merc460 posted shows numerous tolerances. Which one do I reference for the plastigage measurement? (Out-of-Round, Taper, Runout?)
I've used plastigage before but was basically given the green strip and told, "If the thickness of the plastigage falls between this number and this number, you're ok".
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Post by merc460 on Nov 4, 2009 9:52:25 GMT -5
You want to worry about all of them. But with plastigage you can only roughly check clearences. which is there lower right on the first page. Mains desired .0008-0015 and the allowable is up to .0026. Rods are the same.
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Post by Strangeleak on Nov 4, 2009 11:19:46 GMT -5
Ahhh, I see it now. Thanks
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Post by oneowner88lx on Nov 5, 2009 10:56:22 GMT -5
I would take the block with the main caps along with the rods to the shop and let them check the clearances, taper, and out of round. Then double check with plasti guage yourself or buy some tools from Summit and/or ebay and check them yourself. As a last final check I assembled mine with no piston rings to make sure it spun easily.
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