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 529 of 1417

REMOVAL

NOTE

Assistant will help with this procedure.

1.

Remove plug (Figure 1, Item 4) and preformed packing (Figure 1, Item 3) from flywheel housing (Figure 1,

Item 2). Discard

preformed packing.

2.

Using engine barring tool (Figure 1, Item 9), prevent crankshaft (Figure 1, Item 1) from turning.

3.

Remove four screws (Figure 1, Item 6) and vibration damper (Figure 1, Item 5) from crankshaft

(Figure

1,

Item

1).

4.

Inspect vibration damper (Figure 1, Item 5) for bends, breaks, and damaged pulley grooves. Replace vibration

damper (Figure 1, Item 5) if bent, broken, or grooves are damaged.

5.

Inspect vibration damper alignment marks (Figure 1, Item 8). Replace vibration damper (Figure 1, Item 5) if

alignment marks are 0.063 in. (1.60 mm) out of alignment.

6.

Inspect rubber member (Figure 1, Item 7) for wear and damage. Replace vibration damper (Figure 1, Item 5)

if damaged or worn more than 0.125 in. (3.18 mm) deeper than face of vibration damper.

TM 9-2320-272-23-2

0219

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