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G838 Owner's Club • View topic - compression test, what's good?

compression test, what's good?

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compression test, what's good?

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compression test, what's good?

Postby UpstateSC » December 6th, 2017, 3:31 pm

Working on figuring out what need done on a engine.

Tested the compression. - Engine at the low edge of normal operation temp, 125 across all 4. Good? not good?
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Re: compression test, what's good?

Postby rickf » December 6th, 2017, 4:57 pm

Extremely good, almost too good. That kind of tells me there might be carbon on the pistons or more likely you did not have the throttle blocked open during the compression test.
1964 M151A1
1984 M1008
1967 M416
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12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone
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Re: compression test, what's good?

Postby UpstateSC » December 7th, 2017, 10:04 pm

oops check it again with the throttle open
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Re: compression test, what's good?

Postby njjeeper » December 8th, 2017, 10:33 am

Doesn't having the throttle closed result in lower numbers?
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Re: compression test, what's good?

Postby UpstateSC » December 8th, 2017, 2:10 pm

cold, throttle open.

now 112-115
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Re: compression test, what's good?

Postby Surveyor » December 8th, 2017, 3:28 pm

I started off with way worse and a couple cylinders pitted. Tore it down based on Rick's and others advice. Honed the cylinders (still minor pitting visible on 2), lapped the valves, set the valve clearances, new rings, etc.. Put back together. With throttle open/cold they ranged from 125 to 113. Runs great so far but idling fast and next chance I get I'll work on that (linkage needs adjusting). Looking at past posts, Rick stated TM shows 135 to 145 psi as spec. We are slightly lower so I suspect slight burning of oil and slightly lower power and fuel efficiency than one to spec.
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Re: compression test, what's good?

Postby rickf » December 8th, 2017, 6:19 pm

1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone
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Re: compression test, what's good?

Postby rickf » December 8th, 2017, 6:54 pm

Well, I looked it up and they do say 135-145 at cranking speed. I would have to see that to believe it! First off is the normally slow cranking speed of these and second is the low compression ratio. Like I said, under idea circumstances maybe..............................
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone
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Re: compression test, what's good?

Postby Surveyor » December 8th, 2017, 8:07 pm

1960 M151 Run #1 (working on it)
"There is one nut on a M151 that is very difficult to remove....." - K8icu
"She ain't a Cadillac and she ain't a Rolls, But there ain't nothin' wrong with the radio" - Aaron Tippin
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