400 Sbc

Old 04-05-2010, 07:42 PM
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edbrgolf
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Default 400 Sbc

Just wondering what would cause no end play on the crank.
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Old 04-05-2010, 08:46 PM
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zipper06
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Thrust surface on the crankshaft worn. Also possible but not likely the rear main block faces worn and letting the rear main slide back and forth.

JMO

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Old 04-06-2010, 03:14 AM
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johnracer
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Is this a new build?
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Old 04-06-2010, 05:19 AM
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curtisreed
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Zip,

Wouldn't that cause too much end play?
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Old 04-06-2010, 05:25 AM
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wmeabates
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Rear cap not alined to block,needs moved forward or backward.Bill.
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Old 04-06-2010, 08:47 AM
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edbrgolf
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Yea its a new build with a new crank on a gm 817 block with clevite H series bearings.
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Old 04-06-2010, 12:02 PM
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oldandtired
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Did you "set" the rear main bearing before you torqued the rear cap down? You should bump the crank foward then backward before torquing. Dave
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Old 04-06-2010, 05:50 PM
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zipper06
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Originally Posted by doorracer
Zip,

Wouldn't that cause too much end play?
ops: ops: , Crap i misread the post, i assumed he meant to much end play.
Oldandtired, is right if the cap is not doweled you have too smack the crank forward and backward before torquing the cap down. also they sell an over size rear main to solve the crank wear, it's possible you accidently got one of these in the main bearing set. If you have a set of calibers pull the rear main cap off and measure the the bearing width the check the crank thrust surfaces width.

JMO

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