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Old August 13th, 2017, 09:30
Desert4x4 Desert4x4 is offline
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Join Date: Feb 2014
Location: California
Posts: 122
Late model NP242 rear seal keep blowing

I bought a rebuilt NP242. Late model for a 1999 XJ.
I've replaced the rear output seal 4 times now because it keeps leaking.
Each time the inside of the seal seems to break off, as if the seal is contacting the snap ring that holds the output bearing to the shaft.
Is there supposed to be a washer behind the seal to give the seal a flat surface to ride on so that it doesnt get damaged by the snap ring?

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Old August 13th, 2017, 10:33
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JohnX JohnX is offline
Sarge <3 Ben
Join Date: Nov 2004
Location: Rancho Cucamonga CA
Posts: 8,557
Re: Late model NP242 rear seal keep blowing

The seal should not be riding on any surface but the driveshaft.

Is there excessive play in the output shaft?
Driveshaft yoke worn out so it wobbles on output shaft?
Too much lift with a stock shaft so it doesn't engage the output shaft far enough?
Is the vent line for the tcase plugged?
88 MJ on 40's. 98 XJ on 35's. 98 Dodge, 52psi of boost. 94 Miata LS4. 01 Harley, been to 46 states. 05 KTM, 576cc. 06 Husky, girls need bikes too. 2011 R6, girls need sport bikes too.
And everything fits in the garage!
Originally Posted by mako my day View Post
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