Main Engine 4-Stroke · Main Engines (4-Stroke)
The Cummins Marine 6LNTA855-M is a six‑cylinder, inline (L) medium‑speed diesel engine delivering about 300 kW at 1800 rpm, designed for main propulsion on small to mid‑size commercial vessels.
Do you have the manufacturer datasheet for this model? Send it with the enquiry form — we check it and name the source.
| Lube oil and filter change | 250-500 hours or annually, whichever comes first (based on oil analysis). |
|---|---|
| Fuel filter (primary and secondary) replacement | 250-500 hours or annually. |
| Air filter inspection/cleaning/replacement | 250-500 hours or as needed based on operating environment. |
| Valve lash adjustment | 1000-2000 hours. |
| Cooling system flush and coolant replacement | 2000 hours or every 2 years. |
| Raw water pump impeller replacement | 500-1000 hours or annually. |
| Fuel injector inspection/overhaul | 3000-6000 hours (depending on fuel quality and performance). |
| Turbocharger inspection/overhaul | 3000-6000 hours (based on condition and performance). |
| Cylinder liner bore wear | Max 0.20 mm taper or ovality from original diameter. |
|---|---|
| Crankshaft main/connecting rod journal wear | Max 0.05 mm ovality or taper; max 0.02 mm surface roughness. |
| Piston ring end gap | Max 1.0-1.2 mm (check specific ring type for precise limit). |
| Valve seat recession | Max 0.5 mm below cylinder head surface. |
| Turbocharger shaft radial play | Max 0.30 mm (check specific turbo model for precise limit). |
| Turbocharger shaft axial play | Max 0.15 mm (check specific turbo model for precise limit). |
| Fuel injector pop pressure drop | More than 10-15% below specified new pressure indicates need for service/replacement. |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
A class surveyor will typically focus on the overall condition and operational safety of the engine. Key checks include: verification of engine logbook entries and maintenance records; visual inspection for leaks, corrosion, and cleanliness; testing of all safety devices (overspeed trip, low oil pressure/high temperature alarms and shutdowns); integrity of fuel lines and emergency shut-off arrangements; condition of exhaust system insulation and spark arrestor (if fitted); security and condition of engine mounts; functionality of starting systems (air or electric); and verification of remote control and instrumentation accuracy. Particular attention is paid to any modifications or repairs and their compliance with classification society rules, often requiring documentation of work performed and material traceability. Operational tests under load may be requested to confirm performance and absence of excessive smoke or vibration.
Estimated lifetime: 15,000 - 25,000 hours before major overhaul (assuming diligent maintenance and proper operation).
Free of charge — send us your request for Cummins Marine equipment. Our team checks it and replies by e-mail.
Other models of the same equipment type, Cummins Marine first.
Tell us what you need for this Cummins Marine 6LNTA855-M — a part, a service call, a second opinion. Are you Cummins Marine? Claim this brand page.
Service engineer? Write the day report for this 6LNTA855-M in OceanSphere Work — photos, hours and parts, as a PDF for the owner. Try it free for 14 days →
Yes. Specifications, documents and service notes for this model are readable without an account. An account adds saved searches and requests, nothing is taken away.
Yes. Tell us the manufacturer, the model and what you need — a person reads every request and replies by e-mail.
Send us the nameplate or the correct value. We check it against the manufacturer datasheet or class-society record and update the page.