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Jeep 4.0l Crank Endplay Questions

 
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thakmfb
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Joined: 09 Oct 2011
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PostPosted: Sun Oct 09, 2011 8:38 pm    Post subject: Jeep 4.0l Crank Endplay Questions Reply with quote

I am currently doing a full rebuild on a 92 Jeep Cherokee 4.0L High Output engine. Block and rods were taken to the machine shop for measurements, cleaning, honing and cam bearings/freeze plugs. Everything came back good all the bearing housings within spec.

I purchased a reman. crank kit from Advanced Auto. Put my mains in and crank torque everything down. Check my crank endplay (just to make sure) and I have .009 in of endplay. Measured with a feeler gauge and dial indicator. Factory specs are .0015-.0065 in of endplay.

My question is i know it is not within spec but is it acceptable to run? Or do I need to get it within spec? If I need to get it within spec, what would be the best way to go about this.

Also just to make sure I am measuring 9 thousands of an inch correct and I am tight on endplay. Or am I actually measuring 90 thousands of an inch and VERY loose on end play. Thanks for all of the help, I am not new to rebuilds but new to measurements and adjustments b/c I did factory rebuilds under warranty.
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SMOKEmUP
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1979 Chevrolet Camaro

PostPosted: Mon Oct 10, 2011 5:34 pm    Post subject: Re: Jeep 4.0l Crank Endplay Questions Reply with quote

thakmfb wrote:
Check my crank endplay (just to make sure) and I have .009 in of endplay. Measured with a feeler gauge and dial indicator. Factory specs are .0015-.0065 in of endplay.

Also just to make sure I am measuring 9 thousands of an inch correct and I am tight on endplay. Or am I actually measuring 90 thousands of an inch and VERY loose on end play. Thanks for all of the help, I am not new to rebuilds but new to measurements and adjustments b/c I did factory rebuilds under warranty.


The spec you quoted is 1.5 - 6.5 thousands and you have 9 thousands which is loose.

If you run the engine as described you can run into problems with the transmission alignment, flexplate cracking and/or flywheel/ clutch issues. I would go back to where you bought the crank and see what they have to say.

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af2
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Joined: 01 Sep 2003
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Location: grassvalley, ca
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1933 Willys Coupe

PostPosted: Mon Oct 10, 2011 9:09 pm    Post subject: Re: Jeep 4.0l Crank Endplay Questions Reply with quote

thakmfb wrote:


Also just to make sure I am measuring 9 thousands of an inch correct and I am tight on endplay. Or am I actually measuring 90 thousands of an inch and VERY loose on end play. Thanks for all of the help, I am not new to rebuilds but new to measurements and adjustments b/c I did factory rebuilds under warranty.


I am not trying to be mean but???

.090 and .009 are wayyyyyyyyyyyyyyyyyyyyyyyyyy different.

I would have someone else double check your measurements.

Hmm I did a crap load of Chevrolet warranty work in the early 80's and measured every flipping thing so I wouldn't have a call back.
As Smoke said .009 is pretty loose. As in 9 thou.
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