7-4
Chapter 7 MAINTENANCE SCHEDULE
*1 If it is not a item supplied from Mitsubishi Heavy Industries, maintain the part following the manufacture's opera-
tion manual as required.
*2 Items require special tools or large scale maintenance. For maintenance of those items, contact your local
dealer.
Every 8000 hours
Engine - Major Overhaul
Disassemble the engine, then clean, check and change major parts.
[Parts to be changed at major overhaul.]
Inlet and exhaust valves, inlet and exhaust valve seats, valve rotators, valve
cotters, rocker arm adjusting screws, valve push rods, bridge caps, camshaft
bushings, camshaft expansion plugs, main bearings, cylinder liners, main
bearing cap bolts and washers, piston rings, connecting rod bearings,
damper, crankcase thrust plate and exhaust pipe flexible joint consumable
items (gaskets, oil seals, O-rings, etc.)
<At second overhaul, replace the following parts in addition to the parts
listed above>
Cylinder head bolts, valve guides, valve bridge guides, valve bridges, valve
springs, tappets, camshaft thrust plates, pistons, piston pins, connecting rod
bolts, connecting rod bushings, rocker bushings, fuel pipe assembly, oil pipe
assembly
*2
Fuel Injection Pump - Inspect and Test (Replace parts as needed) *2
Governor - Inspect and Test (Replace parts as needed) *2
Protective Devices - Repair or Replace *1
High coolant temperature, low oil pressure, overspeeding, starting failure,
water supply failure, undervoltage, overvoltage, overcurrent, low coolant
level in tank, low fuel level in tank, etc.
*2
Auxiliary Devices Operation - Check *1
Water heater, oil heater, oil priming pump, fuel transfer pump, governor
motor, etc.
*2
Every 8000 hours
or every 2 years
Coolant - Change 8-17
As required
Fuel Filter - Bleed Air *1 3-2
Radiator Fins - Check and Clean *1 *2
Air Cleaner Element - Clean, Check and Replace *1 8-23
Pre-cleaner - Clean, Inspect and Replace *1 8-21
Exhaust Muffler - Drain Water *1 -
Inside of Engine Breather - Clean *2
Stop Solenoid - Inspect or Replace *2
Couplings - Inspect or Replace *1 *2
Vibration-isolating Rubber - Inspect *1 *2
Table 7-1 Periodic Maintenance Chart for Continuous Use Engine
Inspection and maintenance intervals and items inspected/maintained
Refer-
ence
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