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 136 of 1563
TM 9-2815-220-24
ENGINE ABNORMAL OIL PRESSURE
0018 00
MALFUNCTION 9:
(Continued)
Excessive oil consumption (150:1 fuel-to-oil ratio maximum).
PROBABLE CAUSE
CORRECTIVE ACTION
c. Seasonal grade of oil improper (oil too
light) for ambient temperature.
(1) Refer to pertinent vehicle lubrication order.
(1) Inspect induction system for dust entry (air
cleaner seals, hoses and clamps).
Repair or
replace (WP 0037, Induction Leak Test).
(2) Verify cylinder compression (WP 0033,
Cylinder Compression Check).
d. Piston rings or valve guides worn (result of
dust ingestion).
(3) If compression test indicates engine
damage, repair or replace cylinder
(WP 0135, Cylinder Assembly Repair) and
piston rings (WP 0142, Pistons, Rings, and
Associated Parts Replace/Repair) as
required.
(1) Refer to WP 0142, Pistons, Rings, and
Associated Parts Replace/Repair.
(2) Verify cylinder compression (WP 0033,
Cylinder Compression Test).
e. Piston rings damaged (scuffed due to engine
overheating).
(3) If compression test indicates engine
damage, repair or replace defective parts as
required.
PROBABLE CAUSE
CORRECTIVE ACTION
f.
Turbocharger defective (worn or damaged
seals).
(1) Remove inlet and exhaust elbows, then
check for evidence of oil.
Replace defective
turbocharger (WP 0099, Turbocharger
Assembly Replacement (2CA & 2DA), use
WP 0100 for 2DR).
MALFUNCTION 10:
Excessive crankcase blow-by (high crankcase pressure).
PROBABLE CAUSE
CORRECTIVE ACTION
a. Rings worn or damaged.
Indicated by
heavy carbon deposits in breather tube at
turbocharger exhaust pipe.
(1) Perform Crankcase Blow-by Test as
follows:
PROCEDURE
OBSERVATION
ANALYSIS
Open rear grille doors and
remove transmission cover.
Install 10-inch H
2
O gauge
in crankcase breather
system.
WP 0018 00-4
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