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DESCRIPTION AND OPERATION
TIMING GEARS
The timing gears are located at the rear of the
engine. All of the gears are helical and nitride
hardened. Backing up the gears is a mounting
plate: a 6 mm (1/4 inch) thick steel sheet attached
to the cylinder block. It is provided with two guide
sleeves and a locating pin.
The advantages of this configuration are more
precise timing, fewer components and lower
noise levels. The two-piece flywheel housing also
serves as the timing gear housing.
18
Figure 18 — Timing Gears and Mounting Plate
The fuel/power steering pump drive gear (10) and
the air compressor drive gear (11) are not timing
gears. They fasten to their respective
components and are driven via the auxiliary idler
by the crankshaft gear.
The double idler drives the adjustable idler and
the gear used to drive the power take-off if so
equipped. This is part of the “REPTO-Ready”
feature. A PTO unit with drive gear is substituted
for a cover on the flywheel housing.
The camshaft gear fastens to the hub on the end
of the shaft. A vibration damper also attaches to
the hub outboard of the gear. Teeth on the
damper actuate the camshaft position sensor.
The gear is driven via the adjustable idler.
1. Adjustable Idler Gear
2. Camshaft Gear (with Vibration Damper)
3. Mounting Plate
4. Cylinder Head
5. Cylinder Block
6. Double Idler Gearset
7. Crankshaft Gear
8. Oil Pump Drive Gear
9. Auxiliary Idler Gear
10. Fuel and Power Steering Pump Drive Gear
11. Air Compressor Drive Gear
12. REPTO Drive Gear
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