36
4-CYCLE ENGINE TROUBLESHOOTING CHART (Cont.)
Cause Remedy and Reference
OIL SEAL LEAKS
New seal installed without correct seal driver and Replace with new seal, using proper tools and methods.
not seating squarely in cavity.
New seal damaged upon installation. Use proper seal protector tools and methods for installing
another new seal.
Bent crankshaft causing seal to leak. Check crankshaft for straightness and replace if
necessary.
Oil seal driven too far into cavity. Remove seal and replace with new seal, using the correct
driver tool and procedures.
BREATHER PASSING OIL
Engine speed too fast. Use tachometer to adjust correct RPM.
Loose oil fill cap or gasket damaged or missing. Install new ring gasket under cap and tighten securely.
Oil level too high. Check oil level Turn dipstick cap tightly into receptacle for
accurate level reading. DO NOT fill above full mark.
Breather mechanism damaged. Replace umbrella valve/seat in Vector engine and TVS
engines.
Breather mechanism dirty. Clean thoroughly in solvent. Use new gaskets when
reinstalling unit.
Drain hole in breather box clogged. Clean hole with wire to allow oil to return to crankcase.
Breather mechanism installed upside down. Small oil drain holes must be down to drain oil from
mechanism.
Breather mechanism loose or gaskets leaking. Install new gaskets and tighten securely.
Damaged or worn oil seals on end of crankshaft. Replace seals.
Rings not properly seated. Check for worn, or out of round cylinder. Replace rings.
Break in new rings with engine working under a varying
load. Rings must be seated under high compression, or
in other words, under varied load conditions.
Breather assembly not assembled correctly. See section on Breather Assembly.
Cylinder cover gasket leaking. Replace cover gasket.
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