Lycoming TEO-540-C1A Maintenance Manual page 123

TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
Problem
Low oil pressure
(Cont.)
© 2018 Avco Corporation. All Rights Reserved
November 2018
Table 1 (Cont.)
Fault Isolation Guide
Cause
Damaged oil pressure
relief valve seat
Excess internal oil
leakage
Air leak on suction side
of the oil pump
Relocated oil pressure
take-off
Failed or failing bearings
Corrective Action
Either replace the oil pressure relief
valve
or
Replace the valve seat per the latest
revision of Service Instruction No.
SI-1172 for instructions.
Look for:
• Loose or missing plugs in oil
galley
• Piston cooling nozzles to lock
open during idle rpm
• Too much bearing clearance
• Cracks in the oil galley area of
the crankcase
1. Examine the conditions of these
components:
• Oil suction screen gasket
• Oil sump gasket
• Oil pump mating surface to
accessory housing
2. Replace cracked or damaged
parts.
Use only the approved oil pressure
take-off point.
NOTICE: If the oil pressure take-
off point on the engine has moved
closer to the oil pump, discharge it,
and then the oil pressure will rise.
Metal in the oil filter element or oil
suction screen could be a sign of
excessive bearing wear. Complete
an oil change.
Send the engine to Lycoming
Engines for evaluation. Include a
description of the problem.
Ref.
72-50
12-10
72-50
72-25
12-10
12-30
Page 93