125lb compression reading across all 4 cylinders

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Mar 1, 2020

Bulzi73

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125lb compression reading across all 4 cylinders

can anyone help I'm getting 125lbs across all 4 cylinders , my question is what should the reading be at ? also could my problem be a blown head gasket. thank you

Mar 1, 2020

Colin42

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Re: 125lb compression reading across all 4 cylinders

What problem are you having that made you do a compression test? Depending on how you did the test your reading of 125 may be "correct" especially since you got the same number for all 4 cylinders

Mar 1, 2020

FRSam

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Re: 125lb compression reading across all 4 cylinders

125 is plenty to run if that’s what you’re asking. Mine has 120 on all four cylinders and it runs fine.

Is it running? You’re obviously leaking/burning something from somewhere. 7th gens are notorious for head gasket failure so that’s an option. Are you burning oil? Your compression will be down from that as well. Rings are pretty common as well (that’s the "issue" with mine)

Last edited by FRSam; Mar 1, 2020 at 07:26 PM.

Mar 1, 2020

Wankenstein

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Re: 125lb compression reading across all 4 cylinders

As long as the compression in all cylinders is within 10% of each other compression is good. A breached head gasket betwee two adjacent cylinders would cause those two cylinders to have decreased /low compression. Highly unlikely there would be breaching that would cause low compression on all four cylinders.