4.4 Overhaul inter vals and expected life times
The following overhaul intervals and lifetimes are for guidance only. Achievable lifetimes depend
on operating conditions, average loading of the engine, fuel quality used, fuel handling system,
performance of maintenance etc.
Expected lifetime is different depending on fuel used. For detailed information on fuel qualities,
please see Table Heavy fuel oils.
Table 4-1 Time between Overhaul
Time between inspection or overhaul (h)Component
HFO2 operationHFO1 operationLFO operation
Twin pump fuel injection
- Injection nozzle
120001200012000- Injection pump element
120001600020000Cylinder head
- Inlet valve seat
- Inlet valve, guide and rotator
- Exhaust valve seat
- Exhaust valve, guide and rotator
Piston crown, including recondition
Piston skirt
120001600020000- Piston skirt/crown dismantling one
240002800032000- Piston skirt/crown dismantling all
Piston rings
120001600020000Cylinder liner
Antipolishing ring
120001600020000Gudgeon pin, inspection
120001600020000Gudgeon pin bearing, inspection
Big end bearing
120001600020000- Big end bearing, inspection of one
360003600036000- Big end bearing, replacement of all
Main bearing
120001600020000- Main bearing, inspection of one
360003600036000- Main bearing, replacement of all
Camshaft bearing
360003600036000- Camshaft bearing, inspection of one
600006000060000- Camshaft bearing, replacement of all
120001200012000Turbocharger inspection, cleaning
600060006000Charge air cooler
Rubber elements for flexible mounting
Table 4-2 Expected Life Time
Expected life time (h)Component
HFO2 operationHFO1 operationLFO operation
Twin pump fuel injection
600060006000- Injection nozzle
240002400024000- Injection pump element
600006000060000Cylinder head
DAAB605814 4-7
4. Description of the EngineWärtsilä 46F Product Guide
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