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TM 10-3930-659-34
4-8.
IDLER GEARS MAINTENANCE.
This Task Covers:
a.
Removal
d.
Assembly
b.
Disassembly
e.
Installation
c.
Cleaning and Inspection
Initial Setup:
Equipment Conditions:
Materials/Parts:
• Engine assembly removed (see paragraph 4-3).
• Lubricating oil (Item 39, Appendix B)
• Engine front cover removed (see paragraph 4-14).
• Rags (Item 43, Appendix B)
Tools/Test Equipment:
• Dry cleaning solvent (Item 47, Appendix B)
• General mechanic's tool kit (item 71, Appendix E) a
Nonelectrical wire (Item 59, Appendix B)
• Vernier caliper (Item 10, Appendix E)
General Safety Instructions:
• Dial indicator set (Item 19, Appendix E)
• Sharpening stone (Item 61, Appendix E)
• Dry cleaning solvent is flammable and must not be
used near open flame. Use only in a well-ventilated
• Die and tap threading set (item 68, Appendix E)
area.
• Gear timing tool (Item 70, Appendix E)
• Torque wrench, 0-175 Ib.-ft. (Item 81, Appendix E)
a.
REMOVAL
1.
Pry lower idler gear (5) away from cylinder block front plate (1) as far as possible.
2.
Using dial indicator, measure and note end play of lower idler gear (5). End play must be 0.0010-0.0080 in.
(0.0254-0.2032 mm).
3.
Remove nut (8) and thrustwasher (7) from screw (11).
4.
Remove bushing (6) from lower idler gear (5).
CAUTION
To prevent loss of timing, ensure that other gears DO NOT turn when removing lower idler gear.
5.
Remove lower idler gear (5) from lower idler gearshaft (4).
4-36
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