Quantcast MALFUNCTION 10: Excessive crankcase blow-by (high crankcase pressure).

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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
(1) Refer to pertinent vehicle lubrication order.
light) for ambient temperature.
d. Piston rings or valve guides worn (result of
(1) Inspect induction system for dust entry (air
dust ingestion).
cleaner seals, hoses and clamps). Repair or
replace (WP 0037, Induction Leak Test).
(2) Verify cylinder compression (WP 0033,
Cylinder Compression Check).
(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.
e. Piston rings damaged (scuffed due to engine (1) Refer to WP 0142, Pistons, Rings, and
overheating).
Associated Parts Replace/Repair.
(2) Verify cylinder compression (WP 0033,
Cylinder Compression Test).
(3) If compression test indicates engine
damage, repair or replace defective parts as
required.
PROBABLE CAUSE
CORRECTIVE ACTION
f. Turbocharger defective (worn or damaged
(1) Remove inlet and exhaust elbows, then
seals).
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
(1) Perform Crankcase Blow-by Test as
a. Rings worn or damaged. Indicated by
follows:
heavy carbon deposits in breather tube at
turbocharger exhaust pipe.
PROCEDURE
OBSERVATION
ANALYSIS
Open rear grille doors and
remove transmission cover.
Install 10-inch H2O gauge
in crankcase breather
system.
WP 0018 00-4

 


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