Specifications

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ENGINE VIBRATES EXCESSIVELY
1. Remove the spark plug wire. Check the engine crankshaft on the PTO end for bends using a straight
edge, square or a dial indicator. Blades or adapters must be removed. Significant deflection will cause
a vibration problem.
2. Check the engine mounting bolts, make sure they are tight.
3. Remove and check the attached equipment for an out of balance condition.
4. If the engine is equipped with a counterbalance shaft, check the gear timing to determine if the
counterbalance is out of time.
BREATHER PASSING OIL
1. Check the oil level, make sure the engine is
not overfilled. Also verify that the viscosity
rating on the container of the oil being used
is to specification.
2. Check the angle of operation. Avoid
prolonged use at a severe angle.
3. Check the engine R.P.M. setting for excessive
R.P.M. using a vibratach or other tachometer
and compare it to the R.P.M. settings found
on microfiche card # 30 according to the
engine model and specification number.
Adjust the high and low R.P.M. as necessary.
4. Check for leaking or damaged gaskets, seals,
or "O"-rings. External leaks may not be
evident; however, the leak may prevent the
engine from achieving a partial crankcase
vacuum.
5. Check the breather for damage, dirty
condition, or improper installation. The oil
return hole(s) must face down.
6. Check the engine compression using a
compression tester. If the engine has weak
compression, determine the cause of weak
compression: worn rings, leaking head
gasket, or leaking valves. Follow the
compression tester's procedure.
EXCESSIVE OIL CONSUMPTION
1. Check the oil level, oil viscosity on the container of the oil being used, and oil condition. Replace and
fill to the proper level.
2. Check the angle of operation. Avoid prolonged use at a severe angle.
3. Check for leaking or damaged gaskets, seals, or "O"-rings. External leaks may not be evident, however,
the leak may prevent the engine from achieving a partial crankcase vacuum.
4. Check the engine R.P.M. setting using a vibratach or other tachometer and compare it to the R.P.M.
settings found on microfiche card # 30 according to the engine model and specification number. Adjust
as necessary. The computer parts lookup systems also have RPM information listed in each individual
engine parts list.
5. Check the breather for damage, dirty condition, or improper installation. The oil return hole(s) must
face down.
6. Clean the cooling fins to prevent overheating.
7. Check the carburetor setting causing a lean running condition, overheating the engine.
8. Check the engine compression using a compression tester. If the engine has weak compression,
determine the cause of weak compression: worn rings, leaking head gasket, or leaking valves. Follow
the compression tester's procedure.
9. Check the valve guide clearance for excessive wear.
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2 and 4-CYCLE RPM SETTINGS 30
NOTE: MICROFICHE CARD 30 RPM'S ARE NOT ON
PAPER
NOTE: RPM SETTINGS CAN ALSO BE FOUND ON
THE COMPUTERIZED PARTS LOOK UP SYSTEMS.
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