Volvo Penta D25A MS Operator's Manual page 35

Maintenance schedule
Every 250 operating hours or every 12 months
* Change lubrication oil. Longer interval requires oil analysis
* Change full flow and by-pass lubrication oil filters
* Check/adjust V-belts
* Check sea water filter
* Check/wash air pre-cleaner (turbo)
Every 500 operating hours or every 12 months
* Change governor lubrication oil filter
Every 1000 operating hours or every 12 months
* Change fuel filter elements
* Change filter elements of the fuel pre-filter/water separator
* Check air filter (if installed)
* Check/retighten bolts and nuts
* Check/adjust fuel injection timing
* Check/adjust fuel injection pressure and spray pattern
* Change fuel injection nozzle o-rings
* Check and adjust valve clearance and valve mechanism
Every 2000 operating hours or every 12 months
* Check/adjust valve clearance. Check valvemechanism
* Check turbocharger
* Check starter motor
* Check alternator
* Check fuel injection pump flex drive plates
* Check fuel injection pump control rack operation
* Check fuel rack control "ball joints"
* Check/clean charge air cooler(s)
* Check/clean cooling water heat exchanger
* Check coolant concentration
* Check torsional vibration dampers
* Check alarm and shut-down functions
* Check engine control panel functions
* Change V-belts
* Change fuel pre-filter/water separator element
* Check/change zinc anodes
* Change turbo charger air filter
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