Wartsila 31, Product Manual

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4.3 Expected overhaul intervals and life times
The following overhaul intervals and lifetimes are for guidance only. Actual figures will be
different depending on service conditions. Expected component lifetimes have been adjusted
to match overhaul intervals.
In this list HFO is based on HFO2 specification stated in the chapter .
4.3.1 Time Between Overhaul and Expected Life Time
Table 4-1 Time Between Overhaul and Expected Life Time
Expected life time (h)
1)
Time between inspection or overhaul
(h)
Component
LFO HFO LFO HFO
Min. 96000 Min. 72000 32000 24000 Piston
32000 24000 32000 24000 Piston rings
128000 96000 32000 24000 Cylinder liner
64000...128000 48000..96000 32000 24000 Cylinder head
32000 24000 32000 24000 Inlet valve
32000 24000 32000 24000 Exhaust valve
64000 48000 32000 24000 Main bearing
32000 24000 32000 24000 Big end bearing
64000 64000 64000 64000 Intermediate gear
bearings
32000 32000 32000 32000 Balancing shaft
bearings
NA NA 8000 8000 Injection valve
(wear parts)
24000 24000 24000 24000 High Pressure fuel
pump
NOTE
1) 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.
4.4 Engine storage
At delivery the engine is provided with VCI coating and a tarpaulin. For storage longer than 3
months please contact Wärtsilä Finland Oy.
Wärtsilä 31 Product Guide - a1 - 18 October 2016 4-5
4. Description of the Engine Wärtsilä 31 Product Guide