TM-9-2320-272-23-2
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 2 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-2 - Page 283 of 1417
G08: COMPRESSION UNBALANCE TEST - Continued
STEP
NOTE
Compression unbalanced test takes approximately 15 seconds to run.
1.
Run compression unbalance test.
a.
Shut off fuel supply so engine will not start.
b.
Dial 14 into TEST SELECT and press TEST.
Table
1.
Engine RPM Test.
TEST NO.
TEST
14
Compression Unbalance
c.
Wait for prompting message GO to appear.
T0010DAA
Figure 1.
GO Prompting Message.
d.
When GO appears, crank engine.
e.
Just after starting to crank, VTM display should change to - - - -, indicating VTM is accepting data.
f.
Stop cranking when VTM displays OFF or E013.
T0011DAA
Figure 2.
CAL Prompting Message.
g.
Wait for a number to be displayed.
TM 9-2320-272-23-2
0195
0195-2
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