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940 compression test 900 1991

uid 6185's pic
posted by  blue940 on  Fri Feb 15 19:00 CST 2002
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last visit: Sat Oct 18 21:11 CST 2014
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Hi all,

This morning I performed a compression test on my 91 940 GL with B230F
engine and these were the results.
#1cyl(back) 170psi; #2cyl(second from back) 160psi;#3 162psi; #4(front)150psi.
These reading were taken with the engine warm and it took eight cranks to obtain these readings.
Can anybody advise what are the correct specs for compression in this
engine? My haynes manual says about 130 to 150psi is correct but I'm
starting to wonder about that. There is 20psi variation between the highest
and lowest cylinders. Is this too much? about right?
Also, when I took the spark plugs out those from #1 and 3 had a very white
nose and few deposits on them. What could this mean? #2 and 4 spark plugs
were grey/tan which is normal.

Thanks
Brad
91 940GL





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New 940 compression test [900][1991]
posted by  blue940  on Fri Feb 15 19:00 CST 2002 >


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