Product Guide
4. Description of the Engine
4.4Overhaul intervals and expected lifetimes
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 6. Fuel Oil System.
Table 4.1 Time between overhauls and expected component lifetimes |
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|
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Component |
HFO |
MDF |
HFO |
MDF |
|
Time between overhauls [h] |
Expected component lifetimes [h] |
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Piston crown |
12000 |
16000 |
24000 |
48000 |
Piston rings |
12000 |
16000 |
12000 |
16000 |
Cylinder liner |
12000 |
16000 |
48000 |
64000 |
Cylinder head |
12000 |
16000 |
|
|
Inlet valve |
12000 |
16000 |
36000 |
32000 |
Exhaust valve |
12000 |
16000 |
24000 |
32000 |
Injection nozzle |
6000 |
8000 |
6000 |
8000 |
Injection element |
12000 |
16000 |
24000 |
32000 |
Main bearing |
12000 |
16000 |
36000 |
48000 |
Big end bearing |
12000 |
16000 |
24000 |
32000 |
22 |
Product Guide Wärtsilä 20 - 3/2009 |