List:
Someone spoke about an “oil test” of the cylinders. How is that done?
Thanks
Lou
Lou, you measure compression first as usual then after adding ~1 oz of motor oil to each cylinder. If compression pressure increases with oil, it suggests that worn rings, rather than valves, are the reason for the leak.
In your situation, the compression in a cylinder with a bent valve would probably be very low, ruling out worn rings. A better test for you to consider might be a “leak down” test. You pressurize a cylinder and then try to hear where the air is leaking–out the intake, out the exhaust, into the oil, or into the water. Instructions and tools to do it are described, maybe in J-L archives.
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Bent valves would show up as ‘no’ compression in the affected cylinders with the standard compression test, Lou…
The tests outlined by Robert are back-ups to probe lesser compression anomalies.
However, unless you have the cams properly set and working correctly with engine rotation; tests are meaningless…
Frank
xj6 85 Sov Europe (UK/NZ)
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