Kohler Command CV730 User Manual download pdf (Page 27)

3.4

Section 3

Troubleshooting

Possible Cause Solution

1. Disassemble breather, clean parts thoroughly,

reassemble, and recheck pressure.

2. Replace all worn or damaged seals and gaskets.

Make sure all fasteners are tightened securely.

Use appropriate torque values and sequences

when necessary.

3. Recondition piston, rings, cylinder bore, valves,

and valve guides.

4. Repair/replace restricted muffler/exhaust

system.

1. Crankcase breather clogged or inoperative.

2. Seals and/or gaskets leaking. Loose or

improperly torqued fasteners.

3. Piston blowby or leaky valves (confirm by

inspecting components).

4. Restricted exhaust.

No Crankcase Vacuum/Pressure in Crankcase

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.

Cylinder Leakdown Test

A cylinder leakdown test can be a valuable alternative

to a compression test. By pressurizing the combustion

chamber from an external air source you can

determine if the valves or rings are leaking, and how

badly.

Cylinder Leakdown Tester (see Section 2) is a

relatively simple, inexpensive leakdown tester for

small engines. The tester includes a quick disconnect

for attaching the adapter hose, and a holding tool.

Leakdown Test Instructions

1. Run the engine for 3-5 minutes to warm it up.

2. Remove the spark plug(s) and the air filter from

engine.

3. Rotate the crankshaft until the piston (of cylinder

being tested) is at top dead center of the

compression stroke. Hold the engine in this

position while testing. The holding tool supplied

with the tester can be used if the PTO end of the

crankshaft is accessible. Lock the holding tool

onto the crankshaft. Install a 3/8" breaker bar into

the hole/slot of the holding tool, so it is

perpendicular to both the holding tool and

crankshaft PTO.

If the flywheel end is more accessible, use a

breaker bar and socket on the flywheel nut/

screw to hold it in position. An assistant may be

needed to hold the breaker bar during testing. If

the engine is mounted in a piece of equipment, it

may be possible to hold it by clamping or

wedging a driven component. Just be certain that

the engine cannot rotate off of TDC in either

direction.

4. Install the adapter into the spark plug hole, but

do not attach it to the tester at this time.

5. Connect an air source of at least 50 psi to the

tester.

6. Turn the regulator knob in the increase

(clockwise) direction until the gauge needle is in

the yellow “set” area at the low end of the scale.

7. Connect the tester quick-disconnect to the

adapter hose while firmly holding the engine at

TDC. Note the gauge reading and listen for

escaping air at the carburetor intake, exhaust

outlet, and crankcase breather.

8. Check the test results against the following table:

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Kohler Command CV730 User Manual Page 27

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