Remove any burrs. Inspect seal end
of drive pulley for wear and scoring.
Replace defective parts as necessary.
Vibration Damper and Drive Pulley Installation
damper and drive pulley on the engine.
Section XIII. TIMING GEAR AND END PLATE ASSEMBLY
the oil seal and any other defective
The timing gear assembly is located at the front of
Inspect gears for chips, cracks, worn
the engine. The timing gear cover serves as a bearing
or broken teeth. Replace damaged or
for the front engine support; as a cover for the timing
gears, and also holds the engine front oil seal. The
Note. Crankshaft and camshaft gears must
timing gear train consists of a helical drive pinion,
be replaced in pairs.
mounted on the crankshaft, which drives a helical gear
that is attached to the camshaft. The drive adapter gear
Inspect the end plate for straightness.
meshes with the camshaft gear and turns at half the
If it is not straight, place the plate on a
speed of the engine crankshaft.
flat surface and straighten.
Timing Gear and End Plate Assembly Removal
Inspect camshaft thrust plate for
scoring and wear. If any indication of
either is apparent, replace the
camshaft thrust plate.
Remove the injection pump drive gear
Remove the vibration damper and drive
gears and end plate assembly on the engine. Torque
camshaft nut to 120-130 ft-lbs.
gear cover from the engine.
Pry the teeth as far apart as possible and
Note. With a suitable lifting device
measure the clearance with a 0.0015 in. feeler gage.
raise and block the engine.
Clearance is not excessive if the gage will not enter the
gap between the teeth. To be certain the gears are not
gears and end plate assembly from the engine.
too tight, touch the gears at a mating point and tap the
camshaft gear. If there is vibration at the mating point
Timing Gear and End Plate
the fit is correct.
Cleaning, Inspection, and Repair
Check camshaft end play. Correct end play
Clean all metal parts in an
should be 0.005 to 0.009 in. Replace thrust plate if end
approved cleaning solvent. Replace all gaskets.
play is incorrect.
Inspection and Repair.
Check crankshaft end play. Correct end
Inspect the timing gear cover and
play is 0.005 to 0.008 in. Add or remove shims as
front engine mount for cracks or dam
necessary to obtain correct end play.
age to machined surfaces. Replace