TM 10-4320-307-24
4-14
GEAR COVER ASSEMBLY REPAIR/REPLACE.(CONT).
TESTING:
1.
Test accessory drive gear (1) backlash as follows:
a.
Mount dial indicator (2) to guide stud (3)
screwed into engine block flange (4).
b.
Position plunger of dial indicator (2) flat
against gear tooth (5).
c.
Turn accessory drive gear (1) clockwise until
tight.
d.
Zero dial indicator (2) index line.
e.
Turn accessory drive gear (1) counterclock-
wise until tight.
NOTE
Measure movement between gears
only, not side to side movement.
f.
Note amount of movement of dial indicator
hand. The normal range is 0.004 to 0.016
inch (0.10 to 0.40 mm). If less than 0.002
inch (0.05 mm), replace drive gear (1).
2.
Test oil pump drive gear (6) backlash as follows:
a.
Mount dial indicator (2) to guide stud (3)
screwed into engine block flange (4).
b.
Position plunger of dial indicator (2) flat
against gear tooth (7).
c.
Turn oil pump drive gear (6) clockwise until
tight.
d.
Zero dial indicator (2) index line.
e.
Turn drive gear (6) counterclockwise until
tight.
NOTE
Measure movement between gears
only, not side to side movement.
f.
Note amount of movement of dial indicator
hand. The normal range is 0.004 to 0.016
inch (0.10 to 0.40 mm). If less than 0.002
inch (0.05 mm), replace drive gear (6).
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