D439E Service Manual 2. Engine Mechanical System (D439E)
19
Timing Gear
1. Timing gear is installed in the timing gear case at
the front of engine.
2. Each gear is helical gear manufactured with high
precision and Its surface is treated by heat to
enhance the durability.
3. Timing marks are marked on the gear. When
assernblinq, by aligning the timing marks, gears
can be engaged correctly.
4. Bushes are press-fit into idler gear, which rotates
idler shaft A (1) and idler shaft B (2). Idler shaft
and gear oil hole provides oil passage to lubricate
bush and gear.
Flywheel
1. Flywheel is made of forged iron. Pilot bearing of
transmission drive pinion is disposed at the center
portion. Ring gear which can be geared with
starter pinion is pressed fit at the circumferential
of tile flywheel.
2. Processed is formed at the outer diameter of the
flywheel to measure the engine rpm.
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