7-3
Chapter 7 MAINTENANCE SCHEDULE
*1 It is not a item supplied from Mitsubishi Heavy Industries, Ltd., however, please maintain the part regularly to use
the engine securely and effectively.
*2 Items require special tools or large equipment. For the servicing of those items, contact a dealer of Mitsubishi
Heavy Industries, Ltd.
Every 8000 service hours
Engine - Major overhaul
Disassemble engine, clean, check and change major parts.
[Parts to be changed]
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 consumable items (gaskets, oil seals, O-
rings, etc.)
[In 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 necessary) *2
Governor - Inspect and Test (Replace parts as necessary) *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 - Checkt*1
Water heater, oil heater, oil priming pump, fuel transfer pump, governor
motor, etc.
*2
Every 8000 service hours
or 2 years
Coolant - Change 8-13
As required
Fuel system - Bleed air*1 3-2
Radiator fins - Check and Clean*1 8-15
Air cleaner element - Clean, Check and Replace*1 8-17
Cleaning the Inside of the Engine Breathers *2
Stop solenoid - Inspect or Replace *2
Couplings - Inspect or Replace*1 *2
Inspecting the vibration-isolating rubber*1 *2
Table 7-1 Periodic maintenance chart for regular use engine
Interval and Service item
Refer-
ence
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