Tecumseh VLV Technician's Handbook page 39

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