Page 140
REPAIR INSTRUCTIONS, PART 1
3. Remove and set aside the auxiliary idler
gear. Remove the O-ring.
173
Figure 173 — Auxiliary Idler Placement with O-Ring
4. Remove the six Allen-head screws securing
the intermediate idler gearset hub to the
cylinder block and remove the gearset from
the engine.
Do NOT disassemble the intermediate idler
gearset. The intermediate idler gearset consists
of two gears and back-to-back tapered roller
bearings set to specified bearing preloads. The
assembly is held together by a large spanner nut
and six hex-head screws. Loosening and/or
removing the fasteners in any way may change
the bearing preload settings and result in bearing
failure.
ADJUSTABLE IDLER GEAR REMOVAL
To remove the adjustable idler gear from the
engine:
1. Remove and discard the five screws
securing the adjustable idler gear hub to the
cylinder head and cylinder block.
The adjustable idler gear fasteners are one time
use only.
2. Remove the adjustable idler gear, hub and
thrust washer from the engine.
If the engine is not being completely
disassembled for overhaul and only the cylinder
head is to be removed, it is not necessary to
remove the adjustable idler gear. However, the six
screws A and C which secure the timing gear
plate to the cylinder head and the three upper
screws B securing the adjustable idler gear to the
cylinder head MUST BE REMOVED (Figure 174).
Refer to the “Cylinder Head Removal” procedure
which follows later in this section.
174
Figure 174 — Cylinder Head-to-Timing Gear Plate Screw
Locations
1. Auxiliary Idler Gear
2. Intermediate (Double
Idler) Gear Set
3. O-Ring
4. Crankshaft Gear
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