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 overhaul [h]
Component
HFO operation
MDF/GAS operation
HFO operation
MDF/GAS operation
40000...48000
48000...60000
12000...20000
16000...24000
Piston
12000...20000
16000...24000
12000...20000
16000...24000
Piston rings
60000...100000
60000...100000
12000...20000
16000...24000
Cylinder liner
60000...100000
60000...100000
12000...20000
16000...24000
Cylinder head
24000...40000
32000...48000
12000...20000
16000...24000
Inlet valve
24000...40000
32000...48000
12000...20000
16000...24000
Exhaust valve
4000...6000
4000...8000
2000
4000...8000
Injection valve nozzle
12000...16000
12000...16000
12000...16000
12000...16000
Injection valve complete
24000...48000
24000...48000
24000
24000
Injection pump
-
24000
-
-
Pilot fuel pump
32000
32000
16000
16000
Main bearing
12000...20000
16000...24000
12000...20000
16000...24000
Big end bearing
-
16000
-
8000
Main gas admission valve
28
Product Guide Wärtsilä 34DF - 3/2012
Product Guide
4. Description of the Engine