Main Engine 4-Stroke · Main Engines (4-Stroke)
The Caterpillar MaK 9L M552C is a medium‑speed, 9‑cylinder, heavy‑duty trunk‑piston diesel engine delivering roughly 7 500 bhp at 500 rpm, primarily used for main propulsion on older tankers and bulk carriers.
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| Piston/liner overhaul | per Caterpillar MaK's own running-hour schedule for this engine on HFO, commonly quoted in the order of 12,000-20,000 hours - confirm against the engine's own maintenance manual |
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| Exhaust valve overhaul | typically a shorter running-hour interval than piston/liner work - confirm against the manual |
| Turbocharger overhaul | per the turbocharger manufacturer's running-hour interval |
| Lube oil analysis | every few hundred running hours, or per the vessel's oil analysis programme |
| Fuel injection pump/nozzle service | per Caterpillar MaK's running-hour interval |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Cylinder liner bore wear | renewal is typically flagged in the order of 0.3-0.5% of nominal bore diameter for a medium-speed trunk piston engine of this class - confirm the exact figure against Caterpillar MaK's own limit for the 552 mm bore before condemning a liner |
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| Piston ring end gap | typically on the order of 1-2 mm depending on ring position for a bore of this size - confirm against the maker's manual rather than a generic figure |
| Main bearing clearance | acceptable range depends on the journal size and bearing design fitted to this engine - measure and compare against Caterpillar MaK's own tolerance table rather than assuming a figure |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Under Continuous Survey Machinery (CSM), class wants running-hour records, trended lube oil analysis, crankcase oil mist detector and relief door function tests, and piston/liner/turbocharger overhaul records tied to actual running hours rather than calendar time. Borescope or open-up inspection findings should be retained for the surveyor to review.
Estimated lifetime: Major component overhaul intervals are typically in the 12,000-20,000 running-hour range noted above. With progressive overhaul of liners, pistons, and bearings, engines of this family commonly remain in service for several decades overall, but the total figure depends heavily on fuel quality, load profile, and maintenance history rather than a single number.
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