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YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
Problem
High manifold
pressure at idler
(Cont.)
High oil pressure
© 2021 Avco Corporation. All Rights Reserved
February 2021
Table 1 (Cont.)
Fault Isolation Guide
Cause
Incorrect hydraulic
lifters were installed
Oil pressure incorrectly
adjusted
Incorrect weight of oil
used
Oil passage is blocked
from the pressure relief
valve to the sump
Relocated oil pressure
take-off point on the
engine
Oil temperature is too
cold
Correction Steps
Replace hydraulic lifters with the
correct part number for lifters.
Refer to the latest revisions of
Service Instruction Nos. 1529 and
No. 1011.
NOTICE: Keep the cylinders and
plungers together as an assembly
when you remove hydraulic lifters
from the engine. If they become
separated, replace with new ones.
Incorrectly assembled body and
plunger assemblies will change
the leak-down rate.
1. Increase the oil pressure by
turning the adjusting screw
clockwise.
2. Decrease the oil pressure by
turning the adjusting screw
counterclockwise.
Use the recommended viscosity of
oil for the ambient temperature.
1. Remove the pressure relief
valve from the engine.
2. Push a soft copper wire
through the oil passage to the
sump to remove blockage.
NOTICE: If blockage continues,
remove sump and clean passage.
Use only the approved oil pressure
take-off point.
NOTICE: If the oil pressure
take-off point on the engine is
moved closer to the oil pump
discharge, oil pressure will
increase.
Before increasing the throttle,
allow the oil temperature to
increase.
Ref.
OHM
72-50
IOM
Appendix
A
OHM
12-30
Page 85
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