Overhaul (Major) - Perkins 4006-23 Operation And Maintenance Manual

SEBU9077-01
Illustration 67
(1) Clamp torque 7 N·m (62 lb in)
Clamps and V-Band Clamp Torques
Table 18
Clamps and V-band Clamp Torques
Clamp
1
2
3

Overhaul (Major)

Scheduling a Major Overhaul
The need for a major overhaul is determined by
several factors:
• An increase of oil consumption
• An increase of crankcase blowby
• A decrease and variation of cylinder compression
(2) Clamp torque 9 N·m (79 lb in)
Torque
7 N·m (62 lb in)
9 N·m (79 lb in)
10 N·m (88 lb in)
i06530584
Other factors must also be considered for
determining a major overhaul:
• The service hours of the engine
• The wear metal analysis of the lube oil
• An increase in the levels of noise and vibration
An increase of wear metals in the lube oil indicates
that the bearings and the surfaces that wear may
need to be serviced. An increase in the levels of
noise and vibration indicates that rotating parts
require service.
Note: Oil analysis can indicate a decrease of wear
metals in the lube oil. The cylinder liners may be
worn so that polishing of the bore occurs. Also, the
increased use of lube oil will dilute the wear metals.
Monitor the engine as the engine accumulates
service hours. Consult Perkins Engines Stafford
about scheduling a major overhaul.
77
Maintenance Section
Overhaul (Major)
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