Compression test - what range values?

Originally Posted by ZoomZ Try different gauge, and hot. Also note the FSM calls for 200 RPM for those numbers. Make sure you are on a power supply not just

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Compression test - what range values?

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05-21-2020, 04:00 PM

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Rusty

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Quote:

Originally Posted by ZoomZ

Try different gauge, and hot. Also note the FSM calls for 200 RPM for those numbers. Make sure you are on a power supply not just battery. I'm guessing 150 was taken cold. FSM calls for warmed "thoroughly" engine, Fuel depressurized/fuse out, all plugs out, ACCELERATOR PEDAL FULLY DEPRESSED, and fully charged battery (I'd use a power supply).

If you get low readings still, pour some engine oil into cylinder from plug hole. take readings again, If pressure increases, you have worn rings.

zz

Make sure that you pour an equal amount of oil in each cylinder. If not, you can get one or two cylinders reading a lot higher.

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