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. 72000Min. 960002400032000Piston
24000320002400032000Piston rings
960001280002400032000Cylinder liner
48000...9600064000...1280002400032000Cylinder head
24000320002400032000Inlet valve
24000320002400032000Exhaust valve
48000640002400032000Main bearing
24000320002400032000Big end bearing
64000640006400064000Intermediate gear
bearings
32000320003200032000Balancing shaft
bearings
N/AN/A80008000Injection valve
(wear parts)
24000240002400024000High Pressure fuel
pump
N/A16000N/A16000Main gas admis-
sion valve
64000640001600016000LP 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 Guide4. Description of the Engine
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