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Kohler Engine Analysis Kit is recommended. Refer
to the "Special Tools" section for more informa-
tion.
Crankcase Vacuum Test
To test crankcase vacuum with the manometer:
1. Insert the stopper hose into the oil fill hole.
Leave the other vent of the manometer open
to the atmosphere. Make sure the shutoff
clamp is closed.
2.
Start the engine and run at high speed (3200
to 3600 RPM) .
3.
Open the clamp and note the water level in
the tube. The level in the engine side should
be 5 to 1 0 inches above the level in the open
side. If there is no vacuum (level in engine
side is the same as in open side) or a positive
pressure (level in open side is higher than in
engine side) check for the conditions in the
following table.
4.
Close the shutoff clamp before shutting off the
engine.
Compression Test
Because these engines are equipped with an auto-
matic compression release mechanism (ACR), it is
difficult to obtain an accurate compression read-
ing.
To check the condition of the combustion chamber
and related mechanisms, physical inspection and a
crankcase vacuum test are recommended.
NO CRANKCASE VACUUM/PRESSURE IN CRANKCASE
Possible Cause
Solution
1. Crankcase breather clogged or inoperative.
1. Disassemble breather, clean parts thoroughly,
reassemble, and recheck pressure.
2. Seals and/or gaskets leaking. Loose or
2. Replace all worn or damaged seals and gaskets.
improperly torqued fasteners.
Make sure fasteners are tightened securely. Use
appropriate torque values and sequences when
necessary.
3. Piston blowby or leaky valves. (Confirm by
3. Recondition piston, rings, cylinder bore, valves,
inspecting components.)
and valve guides.
4. Restricted exhaust.
4. Replace restricted muffler/exhaust system.
Figure 4-1.
MEASURE DIFFERENCE
BETWEEN COLUMNS
Figure
4-2.
"U" Tube Manometer
4.3
II
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