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 TM 55-1905-221-14-3
6-28.4. CRANKSHAFT TIMING GEAR - MAINTENANCE INSTRUCTIONS.
a. The crankshaft timing gear is bolted to the flange at the rear end of the crankshaft and drives the camshaft gear
(LB and RD engines) or balance shaft gear LD, and RB engines) through an idler gear. One gear attaching bolt hole is
offset so that the gear can be attached in only one position.
b. Since the camshaft and balance shaft gears must be in time with the crankshaft, timing marks are located on two
teeth of the idler gear with corresponding match marks stamped on the crankshaft gear and camshaft and balance shaft
gears, see paragraph 3-28.
c. Left hand helix gear with a letter "L" timing mark is provided for left-hand rotation engines, and a right-hand helix
gear with a letter "R" timing mark is provided for right-hand rotation engines.
NOTE
The present crankshaft gears also are stamped with advance timing mark letter "A".
This task covers:
a. Removal
b. Cleaning
c.
Inspection
d. Installation
INITIAL SETUP
Test Equipment
References
NONE
NONE
Equipment
Special Tools
Condition
Condition Description
Paragraph
Gear puller
Power Unit Removal
Tools
6-40
Flywheel Housing Removal
General Mechanic's Tool Kit
NSN 5180-00-629-9783
Material/Parts
Special Environmental Conditions
Fuel oil
NONE
Personnel Required
General Safety Instructions
1
Observe WARNING in procedure.
6-510
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