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Old 04-26-2017, 07:26 PM   #1
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Default Engine compression

Hey lads i have a mercruiser 4.3L v6 (190) 2001 it's has 556 hours on her and when I get home I am going to be doing compression test on each Cylinder what sort of compression I'm i looking to get of each cylinder for a gd engine
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Old 04-26-2017, 09:36 PM   #2
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Around 150 ft lbs and all cylinders should be within 10% of each other.

If you get a reading of 100 ft lbs or less engine work is in order.
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Old 04-27-2017, 02:13 AM   #3
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I'm at 290 hours now and all mine on my 4.3 are from 180-183 PSI cold (and yes it is a known good compression tester)... but what ever yours are they should be 10% of each other.
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Old 04-27-2017, 11:25 AM   #4
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Quote:
Originally Posted by mmwjr View Post
Around 150 ft lbs and all cylinders should be within 10% of each other.

If you get a reading of 100 ft lbs or less engine work is in order.

Duh foot lbs is torque I meant psi (pounds per square inch)
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