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