Observable Diagnostics and Tests
04
150
23
DPSG,RG40854,357 –19–06NOV00–1/2
Check Camshaft-to-Crankshaft Timing
RG8228A –UN–05DEC97
JDG971 Timing Pin in Camshaft
RG8227D –UN–05DEC97
JDG971 Timing Pin in Crankshaft
RG11165 –UN–30OCT00
Camshaft Timing Slot
A—Timing Pin
B—Flywheel Turning Tool
C—Timing Pin
D—Single Timing Slot
E—Double Timing Slot
Check Camshaft-to-Crankshaft Timing
1. Remove rocker arm cover. See (REMOVE AND
INSTALL ROCKER ARM COVER in Group 020.)
2. Remove plug from cylinder block and install JDG820
Flywheel Turning Tool (B).
IMPORTANT: JDG971 Timing Pin MUST BE installed
into camshaft timing slot (A) first before
attempting to install second timing pin
into crankshaft timing slot (C).
3. Rotate engine flywheel in running direction
(Counter-clockwise as viewed from rear) until JDG971
Timing Pin (A) engages single 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.
4. Remove threaded plug from crankshaft timing hole
below oil cooler and filter housing assembly.
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.
5. Slightly move engine flywheel back and forth with
turning tool until a second JDG971 Timing Pin (C) can
be installed in slot in crankshaft. This ensures that
camshaft and crankshaft are in sync (properly timed).
CTM100 (06APR04)
04-150-23
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=371
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