Main Engine 4-Stroke · Main Engines (4-Stroke)
Weichai Marine M55 — Medium-speed main engine for large vessels, ocean-going ships.
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| Valve clearance check/adjustment | typically every 1,000-2,000 running hours |
|---|---|
| Injector service/exchange | typically every 2,000-4,000 h, engine and fuel quality dependent |
| Turbocharger cleaning/inspection | typically every 2,000-4,000 h, or per rising exhaust temperature trend |
| Lube oil and filter change | per the oil supplier's condemning limits and maker's base interval, typically every 250-500 h for a genset duty cycle |
| Top overhaul (piston/liner inspection) | typically every 8,000-16,000 h depending on load factor and fuel quality |
| Major overhaul (bearings, full strip) | typically every 16,000-24,000 h - confirm against this model's maker schedule |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Piston ring end gap | typically 0.8-1.5 mm for this bore class - confirm against the engine's own manual |
|---|---|
| Cylinder liner bore wear/ovality | condemn per the maker's wear limit table, commonly in the region of 0.3-0.5% of bore diameter - confirm against this model's manual |
| Big-end/main bearing clearance | check against the maker's new and condemning clearance figures - varies by bearing size, no single figure applies |
| Valve clearance drift | re-set once measured clearance falls outside the maker's cold-setting tolerance band |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
As a genset/auxiliary prime mover, class wants running-hour records, evidence of valve and injector service at the stated intervals, crankshaft deflection readings at overhaul, and a functioning overspeed trip verified by test. If enrolled in a Continuous Machinery Survey scheme, component-by-component overhaul records must be traceable against the survey cycle.
Estimated lifetime: Medium-speed four-stroke engines of this class typically run to a major overhaul in the region of 24,000-32,000 running hours, with an overall engine life well beyond that through successive overhauls - actual interval depends on load factor, fuel quality and maintenance history
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