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SECTION 4
TROUBLESHOOTING
. Insert the stopper/hose into the oil fill hole. Leave
the other vent of manometer open to
BASIC ENGINE TESTS
Crankcase Vacuum Test
А
atmosphere.
Make sure the shut-off clamp is
A partial vacuum should be present in the crankcase
closed.
when the engine is operating at normal temperatures.
2. Start the engine and run at high speed (3200 to
Pressure in the crankcase (usually caused by a
3600 RPM).
clogged or improperly assembled breather) can cause
oil to be forced out at oil seals, gaskets, or other
available spots.
3. Open the clamp and note the water level in the
tube. The level in the engine side should be 13 to
20 in. above the level in the open side. If there is
no vacuum (level in engine side is the same as
Crankcase vacuum is best measured with a water
open side) or a positive pressure (level in open
тоотек
Kohler pat hn 25 80050 Is
recom.
side is higher than engine side) check for the con-
mended. Complete instructions are provided in kit.
ini
ditions below.
Test the crankcase vacuum with the manometer as
4. Close the shut-off clamp before stopping the
follows:
engine.
NO CRANKCASE VACUUM/PRESSURE IN CRANKCASE
Possible Cause
Solution
. Disassemble breather, clean parts thoroughly,
reassemble, and recheck pressure.
2. Seals and/or gaskets leaking. Loose or improperly | 2. Replace all worn or damaged seals and gaskets.
1. Crankcase breather clogged or inoperative.
torqued fasteners.
Make sure fasteners are tightened securely. Use
appropriate torque valves and sequences when
necessary.
3, Piston blowby or leaky valves. (Confirm with com- | 3. Recondition piston, rings, cylinder bores, valves,
pression or cylinder leakdown test.)
and valve guides.
4. Restricted exhaust.
4, Replace restricted muffler/exhaust system.
4.3
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