Compression values on a 4.0? - Defender Source
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Old October 11th, 2015, 09:46 PM
Tyler Wirken
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Tyler Wirken
1997 Defender 90 LE
Join Date: May 2007
Location: Kansas City, Mo
Posts: 679
Compression values on a 4.0?

I have searched and searched for this answer but no luck.

Did a compression test today on my 4.0 but have no idea if the value is good and in range.

Only tested two cylinders as I was having a misfire on #2-

Both were at about 160 on the gauge.

Is that within specs? Just want to know I am looking.


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Old October 11th, 2015, 09:57 PM
airbornrover's Avatar
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William Skidmore
1994 D90
Join Date: Oct 2004
Location: Land between 18 and Turnpike
Posts: 1,835
Should be in the repair manual. Does seem in the right range. Shouldnt be anymore then 10psi's(?) difference between any cylinder.
Just to be clear, i was not bragging. i was calling you a pussy. Ren Ching
There is nothing as permanent as a temporary fix. JSBriggs
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