695578
Bent crankshaft causing seal to leak.
Check crankshaft for straightness and replace if necessary.
New seal damaged upon installation.
Use proper seal protector tools and methods for installing
another new seal.
New seal installed without correct seal driver and
Replace with new seal, using proper tools and methods.
not seating squarely in cavity.
Oil seal driven too far into cavity.
Remove seal and replace with new seal, using the correct
driver tool and procedures.
Oil level too high.
Check oil level Turn dipstick cap tightly into receptacle for
accurate level reading. DO NOT fill above full mark.
Loose oil fill cap or gasket damaged or missing.
Install new ring gasket under cap and tighten securely.
Engine speed too fast.
Use tachometer to adjust correct RPM.
Cylinder cover gasket leaking.
Replace cover gasket.
Damaged or worn oil seals on end of crankshaft.
Replace seals.
Breather mechanism loose or gaskets leaking.
Install new gaskets and tighten securely.
Breather mechanism installed upside down.
Small oil drain holes must be down to drain oil from
mechanism.
Drain hole in breather box clogged.
Clean hole with wire to allow oil to return to crankcase.
Breather mechanism dirty.
Clean thoroughly in solvent. Use new gaskets when
reinstalling unit.
Breather mechanism damaged.
Replace umbrella valve/seat in Vector engine and TVS
engines.
Breather assembly not assembled correctly.
See section on Breather Assembly.
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.
Remedy and Reference
Cause
Table 1. 4-Cycle Engine Troubleshooting Chart (Continued)
Breather Passing Oil
Oil Seal Leaks (Continued)
13-4
