Auxiliary Engine (Generator Set) · Auxiliary Engines
Mitsubishi Heavy Industries Engine & Turbocharger MAS 1350 — Marine Auxiliary Generator / Diesel-Electric Propulsion (ferries, tankers, cruise vessels).
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| Lube oil sampling | every 500 running hours |
|---|---|
| Fuel injector overhaul | typically 8,000-12,000 running hours - confirm against the engine's own maker schedule |
| Turbocharger overhaul | typically 12,000-16,000 running hours - confirm against the maker's schedule |
| Cylinder head / valve inspection | typically 8,000-12,000 running hours |
| Major overhaul (piston, liner) | typically 24,000-32,000 running hours, usually tied to the class continuous survey scheme |
| Crankcase oil mist detector function test | every 3 months, per SOLAS requirement for crankcase explosion protection |
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 0.3-0.6 mm per 100 mm bore diameter for this engine class - confirm against the maker's manual |
|---|---|
| Cylinder liner wear/ovality | renewal is typically indicated around 0.15-0.20% of bore diameter - confirm against the maker's limit |
| Main/big-end bearing clearance | typically 0.10-0.25 mm depending on journal diameter - confirm against the maker's manual |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Auxiliary diesel generator sets of this size are commonly enrolled in Continuous Survey Machinery (CMS), where overhaul timing is condition- and running-hour based rather than fixed-calendar. Class typically wants the running-hour log, lube oil analysis trend, oil mist detector test record and evidence that the maker's overhaul schedule is actually being followed.
Estimated lifetime: Major overhaul cycle typically 24,000-32,000 running hours for this bore class, with total service life well beyond 100,000 hours achievable under a class-compliant continuous survey and overhaul regime - confirm against the maker's technical file.
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