Service Manual

CAMSHAFT/CRANKSHAFT 7-9
Camshaft, Tappet
Camshaft Disassembly
•
Remove the governor assembly (see Fuel System chapter).
•
Remove:
Spring [A]

Do not remove the ACR (automatic compression release) weight [B].
Camshaft Assembly
•
Install the governor assembly (see Fuel System chapter).
•
After assembling the camshaft, check the following items.

The governor plate [A] must move freely.

While shaking the camshaft, ACR weight [B] swings smoothly.
Camshaft Inspection
•
Check the camshaft gear [A] for pitting, fatigue cracks, burrs or an
evidence of improper tooth contact.
Replace the shaft if necessary.
•
Check the top of the cam lobes [B] for wear, burrs or uneven contact.
Replace the shaft if necessary.
Camshaft Bearing/Journal Wear
•
Measure the height of each cam lobe.
If the cam height is less than the service limit for either lobe, replace
the camshaft.
Cam Lobe Height
Service Limit: IN. 29.131 mm (1.1469 in)
EX. 29.131 mm (1.1469 in)
•
Measure both camshaft journals at several points around the journal
circumference.
If the journal diameter is less than the service limit, replace the
camshaft.
PTO Side Camshaft Journal Diameter
Service Limit: 15.985 mm (0.6293 in.)
Flywheel Side Camshaft Journal Diameter
Service Limit: 15.985 mm (0.6293 in.)