Lubrication System

OIL DOES NOT RETURN TO OIL TANK

1. Oil tank empty.

2. Scavenger pump gear key sheared.

3. Oil feed pump not functioning.

4. Restricted oil lines or fittings.

ENGINE USES TOO MUCH OIL OR SMOKES EXCESSIVELY

1. Breather valve incorrectly timed.

2. Piston rings badly worn or broken.

3. Chain oiler adjusting screw adjusted for an excessive amount of oil.

4. Insufficient chain case vacuum.

5. Valve guides worn.

ENGINE LEAKS OIL FROM CASES, PUSH RODS, HOSES, ETC.

1. Loose parts.

2. Imperfect seal at gaskets, push rod cover, washers, etc.

3. Restricted oil return line to tank.

4. Restricted breather hose to air cleaner.

EXCESS OIL OUT OF CRANKCASE BREATHER (AIR CLEANER)

1. Insufficient chain case vacuum.

2. Oil not returning to oil tank.

3. Oil lines or passages restricted.

4. Gearcase cover gasket not sealing.

5. Leakage between passages and pockets in gear-case cover and gearcase.

EXCESS OIL OUT OF CRANKCASE BREATHER WHEN STARTING ENGINE

1. Oil pump check ball stuck open.

2. Poor seal between feed and return gears in pump.

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