TM-9-2815-220-24
AVDS-1790 2CA, 2DA and 2DR Air-Cooled 12-Cylinder Diesel Engines
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL FOR AVDS-1790 2CA, 2DA and 2DR Air-Cooled 12-Cylinder Diesel Engines
TM-9-2815-220-24 - Page 137 of 1563
TM 9-2815-220-24
ENGINE ABNORMAL OIL PRESSURE
0018 00
MALFUNCTION 10:
(Continued)
Excessive crankcase blow-by (high crankcase pressure).
PROCEDURE
OBSERVATION
ANALYSIS
Start engine, warm up to
operating temperature, and
perform "stall" test
(WP 0041, Engine Stall
Test).
Go to WP 0016,
Engine Abnormal Exhaust.
5 inch H
2
O (max.) pressure.
Crankcase pressure is normal.
Above 5 inch H
2
O pressure.
Crankcase pressure is high,
indicating excessive blow-by or
restricted crankcase vent at
turbocharger exhaust outlet pipe.
PROBABLE CAUSE
CORRECTIVE ACTION
(2) Clean engine crankcase breather tube
(WP 0078, Engine Oil Hose Assemblies,
Tube Assemblies and Related Parts
Replacement).
a. (Continued)
Rings worn or damaged.
(3) Replace piston rings WP 0142, Pistons,
Rings, and Associated Parts Replace/Repair.
MALFUNCTION 11:
Generator oil pressure abnormal (650 ampere generator).
PROBABLE CAUSE
CORRECTIVE ACTION
a. Restricted oil lines.
(1) Inspect lines for plugging or damage
(WP 0091, Generator Oil Cooling System
Lines and Fittings Replacement).
b. Generator oil pump failure.
(1) Perform Oil Pressure Test as follows:
PROCEDURE
OBSERVATION
ANALYSIS
Remove 1/8-inch pipe plug in center
of generator end plate and install 200
psi gauge.
Oil pressure 100
±
10 psi.
Generator oil pump
operation is normal, the
generator is rotating
and the drive coupling
is functioning.
Start and warm up engine at idle
speed (675-725 rpm) to operating
temperature (140
°
F).
Oil pressure same as normal
engine gallery pressure
(15-25 psi).
Generator oil pump
failed, and/or generator
not rotating, and/or
drive coupling failed.
WP 0018 00-5
Back to Top
