Mitsubishi S12U Operation & Maintenance Manual page 64

Chapter 5
PERIODIC MAINTENANCE CHART
Table 5-2 Periodic maintenance chart for emergency engine (3 / 5)
Service
interval
Every 2
Turbocharger
years
Fuel system accumulator
Coolant
Coolant thermostat
Starting valve
Distributor
Air starter strainer
Every 4 Overhaul of top end of engine
years Disassemble one cylinder, and inspect cylinder head, piston and connecting rod. If
abnormalities are found, disassemble all cylinders for inspection.
Cylinder
heads and
valve mech-
anisms
Safety valve
Cylinder liners
Crankcase
Pistons
Piston rings
Connecting rods
Crankshaft
Damper
Inspection of pipe clamps of fuel
lines, oil lines, instrument pipes
and starting air pipes
Flexible hoses
5-10
Service item
Disassemble and maintain, clean and change expendable parts.
Valve seat
Inlet and exhaust
valves
Cylinder head gas-
ket
Valve guides,
valve rotator,
valve cotter,
pushrods,
rocker arm bush-
ings,
valve springs,
tappet rollers,
tappet brush,
tappet shafts,
tappet guides,
tappet guide set
screws
Stem seal
Service contents
Inspection of shaft for smooth rotation and
and wheel thrust for looseness.
Refill with nitrogen gas.
Change.
Inspect.
Inspect, lap and change O-rings and gas-
kets.
Inspect valve, shafts, bushings and pins,
and change gaskets.
Drain water and clean.
Inspect, regrind and lap.
Inspect, regrind and lap.
Change cylinder head gaskets.
Inspect.
Change.
Inspect and change expendable parts.
Inspect and clean.
Inspect inside(remove the side cover for
inspection).
Inspect including overhaul and clean.
Inspect.
Inspect bolts, inspect Magnaflux serrations,
change big-end bearing shells and inspect
small-end bushings.
Inspect and adjust deflection, and inspect
journals and pins.
Analyze silicon oil properties and change
thermo label.
Inspection of interference and wear, and
repair rubber tape.
Change.
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