Mitsubishi S12U Operation & Maintenance Manual page 65

Table 5-2 Periodic maintenance chart for emergency engine (4 / 5)
Service
interval
Every 4
years
Fuel system
Lubricating
system
Cooling
system
Inlet and
exhaust
systems
Every 8 Major overhaul (complete disassembly and inspection)
years Change all O-rings, gaskets and seals.
Cylinder
heads and
valve mech-
anisms
Safety valves
Cylinder liners
Main bearings
Cam bushings
Pistons
Piston rings
Connecting rods
Front gear and timing gear
Service item
Fuel injection
nozzles
Fuel injection pump
Fuel tank
Oil pump
Oil cooler
Breather
Governor oil filter
Coolant thermostat
Turbocharger
Air cooler
Pre-cleaner
Air cleaner element
Disassemble and maintain, clean and change expendable parts.
Inlet and exhaust
valves and valve
seats
Valve guides, valve
rotators, valve cot-
ters, pushrods,
rocker arm bush-
ings, valve springs,
tappet rollers, tap-
pet roller bushings,
tappet shafts, tap-
pet guides and tap-
pet guide set
screws
Stem seal
Copper tubes and
copper tube O-rings
Chapter 5
PERIODIC MAINTENANCE CHART
Service contents
Change nozzle tips and adjust pressure.
Disassemble, maintain, adjust and change
O-rings.
Clean inside.
Inspect discoloration and external.
Inspect and clean element.
Clean mist separator and change expend-
able parts.
Change.
Change.
Remove carbons, change seal rings and
change expendable parts.
Disassemble and clean element.
Change.
Change.
Inspect, regrind and lap.
Inspect.
Change.
Change.
Inspect and change expendable parts.
Inspect, clean and change O-rings.
Inspect main bearing caps, bolts and main
bearings, and inspect thrust plate.
Inspect.
Inspect including overhaul and clean.
Change.
Inspect bolts, inspect Magnaflux serrations,
change big-end bearing shells and inspect
small-end bushings.
Inspect gear teeth, bearings and shafts.
Change front seal, rear seal, front gear
case gasket and rear gear case gasket.
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