Engine - Engine and crankcase
Zero the dial indicator at this point.
On Tier III and later
Cursor®
9 engines, rotate the engine counterclockwise until the dial indicator reads
5.29 mm
(
0.21 in
) ±
0.05 mm
(
0.002 in
). Check to see if the D hole is in the window and that the timing pin will lock the flywheel.
If the D hole is not centered in the window and the flywheel cannot be locked:
1. Loosen the four bolts that retain the camshaft gear.
2. Rotate the flywheel until the D hole is in the timing window and the flywheel can be locked.
3. Tighten the four bolts that hold the camshaft gear to the camshaft.
Now, verify the timing by turning the engine clockwise
10 - 20 °
and then back counterclockwise until the D hole is in
the timing window and the timing pin will lock the flywheel. Verify the reading on the dial indicator is
5.29 mm
(
0.21 in
)
±
0.05 mm
(
0.002 in
).
NOTE:
For engines without an engine brake engine serial numbers 25342 and after, set backlash to use
4.70 mm
(
0.19 in
).
NOTE:
For engines with or without an engine brake prior to engine serial number 25342, set backlash to use
5.29 mm
(
0.21 in
).
Repeat the above procedure if necessary to obtain the specified timing. Once timing is within the specified range
tighten the camshaft gear retaining bolt to specified torque.
Ultimately timing for the cam on a T8. TIER 4 engine is:
5.29 mm
(
0.21 in
) lift on number 3 exhaust rocker arm at
54 °
before Top Dead Center (TDC) 1 and 6, which is the D hole on the flywheel, visible through the hole in the bottom
of the bell housing.
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