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 TM 9-2815-220-24
ENGINE ABNORMAL EXHAUST
THIS WORK PACKAGE COVERS:
Troubleshooting Table and Diagnostic Tests
INITIAL SETUP:
Tools:
Personnel Required
General mechanic's tool kit (item 121, WP 0176)
Track Vehicle Repairer (2) 63H10
Equipment Conditions:
Engine installed in vehicle or ground hop.
MALFUNCTION 1:
Excessive black smoke (one or both banks).
PROBABLE CAUSE
CORRECTIVE ACTION
a. Induction air inlets blocked with debris.
(1) Inspect and clean air inlet grilles and air
cleaner inlets.
b. Air cleaner restriction (element dirty, wet,
(1) Check restriction as follows:
or blower motor inoperative).
PROCEDURE
OBSERVATION
ANALYSIS
Pre-cleaner Blower:
Blast of air indicates
Start engine and
Note blast of air (on hand) from pre-
blower(s) is operating.
operate at idle.
cleaner air exhaust outlets, two on each air
cleaner.
No air blast.
Blower(s) is
inoperative.
Perform "stall" test as
follows.
Start engine and warm
to normal operating
temperature (140 F).
Engine speed below 1800 rpm.
Engine and
With vehicle brakes
transmission partially
applied and
warmed up (not to
transmission in "high
normal operating
range", depress
temperature of 140F).
accelerator pedal fully
and operate engine for
20 seconds (max.);
release accelerator
pedal and allow engine
to idle 1 minute.
WP 0016 00-1
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