hayhay5757
Member
TO20 COLD #1 110psi/ #2 110psi/ #3 100psi/ #4 90psi
Up to temp #1&2 107 #3 100 #4 95 All hold PSI HOT & COLD
Thoughts
Thanks
Up to temp #1&2 107 #3 100 #4 95 All hold PSI HOT & COLD
Thoughts
Thanks
- Thread starter hayhay5757
- Start date
Jim.ME
Well-known Member
- Location
- central ME
It might not be ideal, but are you having a problem? If not I would say run it, why look for issues. If you are having a problem, telling what the problem is that lead to doing the compression test is might get you better answers as to if the compression is relevant.
Steve@Advance
Well-known Member
I've seen worse and still ran good enough.
Are there any problems? Plug fouling, excess oil consumption, poor idling?
Have the valves been adjusted lately?
If you want to do some further diagnosis, try a dry/wet compression test. After
setting the valves, run the compression test again. Be sure the battery is fully
charged, have all the plugs out, the throttle plate open.
Run the test dry first, then put about a teaspoon of engine oil in each cylinder
and spin the excess out. Then run the test again. If the low cylinder came up,
the rings are leaking. If minimal improvement the valves are leaking.
Are there any problems? Plug fouling, excess oil consumption, poor idling?
Have the valves been adjusted lately?
If you want to do some further diagnosis, try a dry/wet compression test. After
setting the valves, run the compression test again. Be sure the battery is fully
charged, have all the plugs out, the throttle plate open.
Run the test dry first, then put about a teaspoon of engine oil in each cylinder
and spin the excess out. Then run the test again. If the low cylinder came up,
the rings are leaking. If minimal improvement the valves are leaking.
John Deere D
Well-known Member
X 2 as per Jim.ME
x2 as per Steve@Advance
Tight valves are quiet, don't spend enough time in the closed position, can lead to being burnt as well as lowering compression.
That hot wet test can show a bit more. Pistons are not round, they are oblong. They do not turn round until at operating temperature which generally takes 21 minutes of engine run time. They are longer across the piston pin. Aluminum pistons have a different expansion rate than the steel wrist pin and also different from the cast iron block. 21 minutes and another wet test will show more.
Your numbers are also not far enough away to indicate any problems. Generally a variance of 20% is acceptable.
Now if your searching for a closer variance, rebuild the block and see what you get.
Tight valves are quiet, don't spend enough time in the closed position, can lead to being burnt as well as lowering compression.
That hot wet test can show a bit more. Pistons are not round, they are oblong. They do not turn round until at operating temperature which generally takes 21 minutes of engine run time. They are longer across the piston pin. Aluminum pistons have a different expansion rate than the steel wrist pin and also different from the cast iron block. 21 minutes and another wet test will show more.
Your numbers are also not far enough away to indicate any problems. Generally a variance of 20% is acceptable.
Now if your searching for a closer variance, rebuild the block and see what you get.
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