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NP242 Speedo gear leak

Old 12-08-2015, 10:38 AM
Thread Starter
Join Date: Oct 2015
Posts: 2
Model: Cherokee
Default NP242 Speedo gear leak

So I swapped out for a 242 using the same speedo gear that was in the 249. Never leaked in the 249 now I cant get it to stop.

Tried RTV twice and the original o ring looks in decent shape.

Is it true the oring size is
1 7/8-inch Outside Diameter (44mm)
1 9/16-inch Inside Diameter (40mm)
3/32 Wall Thickness (2mm)

I am gonna try to get a new one. Does anyone else have any recommendations?

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Old 12-09-2015, 02:04 PM
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dave1123's Avatar
Join Date: Nov 2010
Location: Manlius, east of Syracuse, NY
Posts: 11,299
Year: 2000
Model: Grand Cherokee (WJ)
Engine: 4.0L

Try a 1/8th O-ring with an 1 7/8 OD and see if it slides in without too much effort. That will give you just a little more compression against the bore. It may work, it may not, but it's worth a try.
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