ENGINE PERFORMANCE LOW
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.
If a rough, noisy, or overheated engine is associated with the reported
low power, prior correction of these malfunctions often will eliminate
the poor performance and, in addition, may prevent further damage
to the engine.
When low power or poor vehicle performance is reported, an engine
"stall" speed test will indicate whether the malfunction is engine or
a. Engine rough operation.
(1) Refer to WP 0014, Engine Rough
b. Engine noisy.
(1) Refer to WP 0015, Engine Noisy Operation.
c. Engine overheating.
(1) Refer to WP 0017, Cooling System
POWER VERIFICATION: Perform engine "stall" test as follows:
Start engine and warm to normal operating temperature (140 F).
Engine speed below 1800 rpm.
With vehicle brakes
warmed up (not to
transmission in "high
Use a calibrated tachometer for
temperature of 140F).
accelerator pedal fully
and operate engine for
20 seconds, release
Limit "Stall Test" to 30-second
accelerator pedal and
intervals maximum, and terminate
allow engine to idle
immediately if transmission warning
WP 0019 00-1