4.4 Overhaul intervals and expected life times
The following overhaul intervals and lifetimes are for guidance only. Actual figures will be different depending
on operating conditions, average loading of the engine, fuel quality used, fuel handling system, performance
of maintenance etc. Expected component lifetimes have been adjusted to match overhaul intervals.
Table 4.1 Time between overhauls and expected component lifetimes
Expected component lifetimes [h]Time between inspection or o verhaul [h]
Component
HFO operationMDF/GAS operationHFO operationMDF/GAS operation
40000...4800048000...6000012000...2000016000...24000Piston
12000...2000016000...2400012000...2000016000...24000Piston rings
60000...10000060000...10000012000...2000016000...24000Cylinder liner
60000...10000060000...10000012000...2000016000...24000Cylinder head
24000...4000032000...4800012000...2000016000...24000Inlet valve
24000...4000032000...4800012000...2000016000...24000Exhaust valve
4000...60004000...800020004000...8000Injection valve nozzle
12000...1600012000...1600012000...1600012000...16000Injection valve complete
24000...4800024000...480002400024000Injection pump
-24000--Pilot fuel pump
32000320001600016000Main bearing
12000...2000016000...2400012000...2000016000...24000Big end bearing
-16000-8000Main gas admission valve
28 Product Guide Wärtsilä 34DF - 3/2012
Product Guide
4. Description of the Engine
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