REPAIR INSTRUCTIONS, PART 3
Page 291
Checking and Adjusting Timing
Gear Backlash
(Camshaft Gear to Idler Gear)
Apply the parking brake before turning the
engine over. Remove the EECU fuse to avoid
starting the engine unintentionally. Make sure
that the transmission is not in gear.
1. Remove the 16 retaining screws and springs
and remove the valve cover from the cylinder
head.
2. Disconnect the wiring harness leads at the
unit injectors and camshaft sensor
connector. Pull the harness out through the
timing gear cover.
3. Remove the compressor coolant lines.
4. Loosen and remove the capscrews securing
the timing gear cover to the cylinder head.
5. Remove the timing gear cover from the
engine. Use care when removing the cover
to avoid the rubber seals falling into the
flywheel housing. Remove the rubber seals
from the cover and discard.
427
Figure 427 — Timing Gear Cover
6. Using the flywheel turning tool, 9996956,
turn the flywheel until the piston in cylinder
No. 1 is at top dead center (TDC), zero
degree mark on the flywheel aligned with the
mark on the flywheel housing. The TDC
marking on the camshaft should be aligned
with the markings on the No. 7 camshaft
bearing cap.
428
Figure 428 — Camshaft Positioning
7. Loosen and remove the eight screws
securing the vibration damper and camshaft
gear to the camshaft. Remove the damper
from the camshaft, but do NOT remove the
camshaft gear.
8. Install the gauge plate tool, J 44514-1A,
using Position B of the gauge plate tool to
secure the camshaft gear to the camshaft
and loosely install the two retaining bolts.
429
Figure 429 — Camshaft Gear Timing Mark Alignment
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