Wartsila ?31DF Series, Product Manual

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4.3 Time between Inspection or Overhaul & Expected Life
Time
NOTE
●
Time Between Overhaul data can be found in Services Engine Operation and
Maintenance Manual (O&MM)
● Expected lifetime values may differ from values found in Services O&MM manual
● Achieved life times very much depend on the operating conditions, average
loading of the engine, fuel quality used, fuel handling systems, performance of
maintenance etc
●
Lower value in life time range is for engine load more than 75%. Higher value
is for loads less than 75%
●
Based on the fuel quality, intermediate mechanical cleaning might be necessary
Expected life time (h) Time between inspection or overhaul
(h)
Component
HFO operation
1)
MDF/ GAS opera-
tion
HFO operation
1)
MDF/ GAS opera-
tion
Min. 72000 Min. 96000 24000 32000 Piston
24000 32000 24000 32000 Piston rings
96000 128000 24000 32000 Cylinder liner
48000...96000 64000...128000 24000 32000 Cylinder head
24000 32000 24000 32000 Inlet valve
24000 32000 24000 32000 Exhaust valve
48000 64000 24000 32000 Main bearing
24000 32000 24000 32000 Big end bearing
64000 64000 64000 64000 Intermediate gear
bearings
32000 32000 32000 32000 Balancing shaft
bearings
N/A N/A 8000 8000 Injection valve
(wear parts)
24000 24000 24000 24000 High Pressure fuel
pump
N/A 16000 N/A 16000 Main gas admis-
sion valve
64000 64000 16000 16000 LP and the HP tur-
bochargers
NOTE
1) For detailed information of HFO1 and HFO2 qualities, please see chapter 6.1.2.3
4-6 DBAE248994
Wärtsilä 31DF Product Guide 4. Description of the Engine