User Manual

200 ENGINE ASSEMBLY
Page 6-37
[213 CH] CAMSHAFT
Description
Refer to Figure 6-42.
The E7 camshaft design uses large journals to
decrease bearing loading and to allow for larger,
more durable cam lobes. In addition, the profile of
the exhaust lobes has been changed (with part
No. 5205) to increase the duration of exhaust
valve opening. Both the camshaft driven gear and
the fuel injection pump driving gear are pressed
onto the shaft.
Figure 6-42 — Camshaft Contours
Special Tools Required
앫 Tappet Holders J 37720-B
앫 Camshaft Removal/Installation Tool J 41461
Inspection
1. Thoroughly clean the camshaft.
2. Inspect the camshaft cam lobes. Replace
the camshaft if cam lobes show evidence of
cracking, pitting or scoring.
To provide increased duration for the exhaust
valve opening, the exhaust lobe profile for cam
part No. 5205 is flatter across the nose portion
compared to traditional MACK cams. Do not
misinterpret this flatter profile design as an
improperly machined or worn lobe. The 5205
cams can be identified by the 3 grooves in the
shaft between the No. 11 and No. 12 lobes. Refer
to Figure 6-43.
Figure 6-43 — Camshaft Identification,
Part No. 454GC5205
3. Inspect the journals. Replace the camshaft if
the journals are scored or worn.
4. Use standard magnaflux inspection
procedures to detect cracks.
MINIMUM ACCEPTABLE CAM LOBE LIFT
Camshaft
Part No.
Exhaust Lobe Intake Lobe
454GC583,
454GC583A
0.300 inch
(7.62 mm)
0.300 (7.62 mm)
454GC5142 0.300 inch
(7.62 mm)
0.270 inch
(6.86 mm)
454GC5205 0.300 inch
(7.62 mm)
0.280 inch
(7.112 mm)
5-101.bk Page 37 Friday, March 17, 2006 11:05 AM