Excessive Oil Consumption - Lycoming O-320 76 Series Operator's Manual

SECTION 6
TROUBLE-SHOOTING
TROUBLE
High Oil Temperature

Excessive Oil Consumption

6-4
LYCOMING
PROBABLE CAUSE
Insufficient air cooling.
Insufficient oil supply.
Wrong grade of oil for season.
Clogged oil lines, strainers or
cooler.
Excessive blow-by.
Failing or failed bearing.
Defective temperature gauge.
Wrong seasonal grade of oil.
Failing or failed bearings.
Worn piston rings.
Incorrect installation of piston
rings.
Failure of rings to seat (new
nitrided cylinders).
SERIES OPERATOR'S MANUAL
REMEDY
Check air inlet and outlet for
deformation or obstruction.
Fill to proper level with specified
oil.
Replace with oil conforming to
specifications.
Remove and clean or replace oil
line, strainers, or cooler.
Usually caused by worn or stuck
rings.
Examine sump for metal particles.
If found, overhaul of engine is
indicated.
Replace gauge.
Fill tank with oil conforming to
specifications.
Check sump for metal particles.
Install new rings.
Install new rings.
Use mineral base oil. Climb to
cruise altitude at full power and
operate at 75% cruise power
setting until oil consumption
stabilizes.
O-320