Question about Kohler CH25 PA-CH730-0040 Command Gasoline Engine

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Looking for the normal cranking comppression I

Looking for the normal cranking comppression I get 85 psi ,on 1 cylinder and 95 psi on the other

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First off the readings your stating are a bit low for BOTH cyclinders but the engine has an automatic compresson release so the readings may be low.

Usually we do a leak down test. The service manual calls for using a tester but I have a spark plug fitting made from a drilled out and tapped spark plug that had the ceramic and electrode removed that was replaced by a fitting and air chuck.

The reason you do a leak down test is:

Compression Test
Some of these engines are equipped with an automatic compression release (ACR) mechanism. Because of the ACR mechanism, it is difficult to obtain an accurate compression reading. As an alternative, perform a cylinder leakdown test.

You charge the cylinder head with 50 PSI and listen for leaks from the engine. (you can increase the pressure if necessary.) There is a tester with a gage for this but I have never used it nor do I own one.. so the red, yellow, and green steps below willnot apply.

Leakdown Test Results

Air escaping from crankcase breather ........................................................ Defective rings or worn cylinder.

Air escaping from exhaust system .............................................................. Defective exhaust valve/improper seating.

Air escaping from carburetor ....................................................................... Defective intake valve/improper seating.

(Below N/A without tester)

Gauge reading in “low” (green) zone .......................................................... Piston rings and cylinder in good

Gauge reading in “moderate” (yellow) zone .............................................. Engine is still usable, but there is some wear present. Customer should start planning for overhaul or replacement.

Gauge reading in “high” (red) zone ............................................................. Rings and/or cylinder have considerable
wear. Engine should be reconditioned or

Thanks for using FixYa.


Posted on May 21, 2010

  • Kelly
    Kelly May 23, 2010

    Just a final note... If you do charge the cylinders with air, they must be at Top Dead Center (TDC) before charging or the piston(s) will stroke from the pressure.



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