CRANKCASE, CRANKSHAFT, AND CAMSHAFT 263
Checking Camshaft Lobes and Journals
Figure 376 Checking camshaft lobes and
journals for wear
1. Use an outside micrometer to measure across
each camshaft lobe from A-D and B-C. Subtract
measurement B-C from measurement A-D. This
is the cam lobe lift.
If any measurement exceeds the specification,
replace the camshaft.
2. Use an outside micrometer to measure the
diameter of each camshaft journal.
If any measurement exceeds the specification
(Table 38), replace the camshaft.
Installation
Coolant Heater (if equip
ped)
1. If servicing a leaky coo
lant heater, replace O-ring
on heater assembly.
2. Place nonpetroleum ba
se lubricant around O-ring
area and install into c
rankcase. Orient electrical
connector so that it i
s facing downward (6 o’clock
position).
3. Tighten the 5/32 in hex socket head cap screw to
thespecialtorquevalue(Table39).
4. Replenish coolant level if only servicing coolant
heater.
Camshaft Bushings
1. Identify each camshaft bushing according to its
outside diameter.
Table 36
Bushing
Location
Outside
Diameter
(nominal)
Width
(nominal)
Front
65.5 mm (2.50 in)
25.4 mm
(1.00 in)
Rear
65.5 mm (2.50 in)
17.8 mm
(0.70 in)
Intermediate
63.0 mm (2.48 in)
17.8 mm
(0.70 in)
2. Lubricate each new camshaft bushing and
crankcase bushing bore with clean engine oil
.
Figure 377 Camshaft bushing installation tool
3. Install new camshaft bearing onto the expanding
collet. Tighten collet by turning adjusting nut until
the bushing is held securely in place.
EGES-265-2
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© 2009 Navistar, Inc.
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