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Which compression test adapter for the 4.0 engine?


jcook100

Well-Known Member
Joined
Apr 5, 2019
Messages
88
City
Salt Lake City, UT
Vehicle Year
1991
Transmission
Manual
Hi guys, I bought a compression test and tried to use it yesterday but the 14mm adapter would not screw in to the spark plug hole. Do I need a different adapter? Maybe one that is longer/deeper? Is 14mm right? See the one I used in the attached photo. Thanks.
 

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You need the longer version, same 14mm but longer, twice that
 
I used a "spark plug anti-fouler" to extend mine.
 

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