Camshaft and Timing Gear Train
02
050
4
RG,RG34710,190 –19–19SEP02–1/6
Adjust Front Timing Gear Backlash
RG8228A –UN–05DEC97
JDG971 Timing Pin in Camshaft
RG8227D –UN–05DEC97
JDG971 Timing Pin in Crankshaft
RG11165 –UN–30OCT00
Camshaft Timing Slot
A—JDG971 Timing Pin
B—JDG820 Flywheel Turning Tool
C—JDG971 Timing Pin
D—Single Timing Slot
E—Double Timing Slot
1. Remove camshaft gear access cover from timing gear
cover. (See REMOVE TIMING GEAR COVER in
Group 040.)
2. Remove rocker arm cover from cylinder head. (See
REMOVE AND INSTALL ROCKER ARM COVER in
Group 020.)
IMPORTANT: Rocker arm assembly should be
completely installed before adjusting
timing gear backlash.
3. Lock camshaft at No. 1 TDC compression stroke by
rotating engine with JDG820 Flywheel Turning Tool (B)
until JDG971 Timing Pin (A) fully engages timing slot
(D) in camshaft. The proper timing slot can be found
by viewing camshaft timing lobe through camshaft
timing pin bore while rotating engine. The double
timing slot (E) will be at approximately 11 o’clock
(viewed from rear of engine) when pin is installed in
slot (D).
This ensures that engine is locked at TDC of No. 1
cylinder’s compression stoke. Intake and exhaust
rocker arms on No. 1 cylinder should be loose.
IMPORTANT: DO NOT insert timing pin full depth into
cylinder block crankshaft timing hole
when rotating engine flywheel until
double slot on camshaft timing lobe is
at approximately 11 o’clock (viewed
from rear of engine) to avoid crankshaft
counterweight bending timing pin.
4. Remove plug and install a second JDG971 Timing Pin
(C) in crankshaft timing hole on right-hand side of
cylinder block. Rotate engine flywheel back and forth
with JDG820 Turning Tool until timing pin (C) enters
timing slot in crankshaft counterweight.
CTM100 (06APR04)
02-050-4
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=244
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