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MAN Energy Solutions

8L80MC-C8

Name: MAN Energy Solutions 8L80MC-C8
Brand: MAN Energy Solutions
SKU: OSE-38257

The MAN 8L80MC-C8 is an eight‑cylinder, low‑speed two‑stroke marine diesel engine delivering up to 67 200 kW at 78 rpm, known for its camshaft‑controlled fuel injection and constant‑pressure turbocharging.

67200.0 kW

Power

Engine Specifications

Cylinders

800 mm

Bore

2592 mm

Stroke

67,200 kW

MCR Power

78.0 rpm

MCR RPM

2-stroke

Stroke Type

Family: MAN B&W MC/MC-C · Tier: Tier II · Fuel: HFO, VLSFO, MDO

Inspector Detail ✓ verified

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Designation decoded

8 stands for 8 cylinders, L for Long-Stroke, 80 for 800 mm bore, MC-C for the MAN B&W MC-Compact series, 8 for Mark 8.

Background

The L80MC-C8 with 8 cylinders is the Long-Stroke variant of the 80 bore class. S/B 3.24 as a balanced compromise between overall height and efficiency. Used on large bulkers, VLCCs and large container ships. The 8-cylinder version for higher power requirements.

Calculated metrics

Stroke To Bore Ratio

3.24

Inspector checklist

Running Gear & Tribology

Cylinder liners: at 800 mm bore and S/B 3.24 — wear measurement at at least 8 positions
Piston rings: document butt clearance, height wear and chrome layer
Cylinder lubrication: flow-test all quills — uniform distribution critical at 800 mm bore

Crosshead & Stuffing Box

Crosshead bearing: temperature and oil supply — 8 bearings to monitor at 8 cylinders
Stuffing box: document drainage trend at every cylinder
Piston rod deflection at docking

Control & Hydraulics

Camshaft chain drive: chain elongation and chain case — longer chain with 8 cylinders
Exhaust valve hydraulics on all 8 cylinders
Fuel injection pumps: timing consistency across all cylinders

Scavenge Air & Exhaust System

Scavenge air box: walk-in — inspect all 8 cylinder ports
Turbocharger: 2-TC configuration — check both units
Exhaust temperature distribution across 8 cylinders

Sealing Systems

Cylinder cover gaskets for blow-by
Exhaust valve seat on all 8 cylinders
Cooling water connections at the cylinder cover

Logbook reference values

Parameter	Expected	Deviation means
Exhaust temperature after cylinder	340–410 °C at MCR	Spread >20 °C → check injection/compression
Scavenge air pressure	2.8–3.5 bar	Drop → TC/cooler
Pmax	±3 bar cylinder balance	Deviation → timing
Cooling water temperature	80–85 °C	Check individual cylinder deviation
Crosshead bearing temperature	55–65 °C	Rise → check bearing condition

Common Failure Modes

Cold corrosion wear of cylinder liner

Symptoms: Increased wear rate, rough surface

Causes: Cooling water below dew point, Feed rate/BN mismatch

Preventive: Cooling water >65 °C, match feed rate and BN to fuel

Stuffing box leakage

Symptoms: Rising drainage, oily deposits

Causes: Sealing rings worn, Piston rod out of round

Preventive: Log drainage weekly, pull stuffing box if trend rises

Exhaust valve burn-out

Symptoms: Rising exhaust temperature of individual cylinder

Causes: Vanadium corrosion, Rotocap defect

Preventive: Check valve rotation, regrind seat

Expert tips

💡 With 8×L80, engine length is considerable — crankshaft alignment requires special attention, perform deflection measurement at all 8 crank throws
💡 The 8-cylinder L80 typically has 2 turbochargers — check TC cut-out at part load, test shut-off flaps and bypass
💡 During inspection, split the cylinder sequence into groups (1-4, 5-8) and compare trends within the groups — differing wear behavior can indicate local cooling problems

Related components

Turbocharger (2-TC) Scavenge air cooler (large surface area) Foundation bolts and chocking (long engine length) Crankshaft main bearings

Classification & regulatory

IMO Tier I compliant. Tier II retrofit possible. MARPOL Annex VI — VLSFO or scrubber.

Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.

Other Cylinder Configurations 50

Components & Design

Component data being added…

Technical Data

unified from engine model True

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Manuals

operating
MAN B&W MC/MC-C Engine Operating Manual (OM-MC-C)
MAN Energy Solutions
maintenance
MAN B&W MC/MC-C Maintenance Manual (MM-MC-C)
MAN Energy Solutions
spare_parts
MAN B&W MC/MC-C Illustrated Parts Catalogue (IPC-MC-C)
MAN Energy Solutions
project_guide
MAN B&W Project Guide MC/MC-C (PG-MC-C)
MAN Energy Solutions

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Equipment Model #38257 · ✓ still in production