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MAN Energy Solutions

6S60ME-LGIM9.6

Name: MAN Energy Solutions 6S60ME-LGIM9.6
Brand: MAN Energy Solutions
SKU: OSE-38382

The MAN 6S60ME-LGIM9.6 is a low‑speed, six‑cylinder, two‑stroke main engine delivering up to 33 900 kW at 105 rpm, distinguished by its dual‑fuel capability that includes high‑pressure methanol injection.

33900.0 kW

Power

Engine Specifications

Cylinders

600 mm

Bore

2400 mm

Stroke

33,900 kW

MCR Power

105.0 rpm

MCR RPM

2-stroke

Stroke Type

Family: MAN Energy Solutions ME-LGIM · Tier: Tier III · Fuel: HFO, VLSFO, MDO, Methanol

Inspector Detail ✓ verified

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Designation decoded

6 = number of cylinders, S = Super Long Stroke, 60 = bore 600 mm, ME = MAN Electronically controlled, LGIM = Liquid Gas Injection Methanol, 9.6 = Mark 9.6 control generation.

Background

The S60ME-LGIM is the Super-Long-Stroke variant of the 60 platform for methanol operation. Compared with the G60 (Ultra Long Stroke), the S variant has a shorter stroke (2400 vs. 2790 mm), runs at a higher speed and is typical for ships with direct propeller drive at moderate speed. Suitable for product/chemical tankers and smaller container ships.

Calculated metrics

Stroke To Bore Ratio

4.0

Inspector checklist

Methanol Fuel System

Methanol high-pressure pumps (600-700 bar): tightness, leak sensors — methanol toxic and burns with an invisible flame
Injection valves: nozzle needle lift, spray pattern, coking from pilot fuel
Double-wall piping: leak detection in the jacket pipe, ventilation of the annular space
Fuel changeover: diesel/methanol switching — tightness and is the purge cycle complete?

Running Gear and Tribology

Cylinder liners: methanol operation requires reduced BN (25-40), document liner wear rate
Piston rings: clean combustion can cause bore polishing — check gap and running surface
Crosshead bearings: S/B=4.0 moderate side forces, check LI shell impression
Stuffing box: log drainage — methanol entry into the crankcase = explosion hazard

Control and Hydraulics (ME System)

HPS: 300 bar system pressure, oil quality ISO 4406 particle count
FIVA valves: methanol-specific fuel maps in the CCU, document software version
Hydraulic methanol injection: document timing deviations >0.5 degrees CA

Safety Systems

Methanol gas detectors: flame ionization or IR (NOT LEL sensors for methane)
ESD: automatic switch-over to diesel on leakage — function test with date
Fuel prep room: UV/IR flame detectors (methanol burns invisibly)
Double-wall piping ventilation: flow monitoring

Exhaust System

Exhaust temperature lower than HFO operation — establish a new baseline for methanol mode
Turbocharger: cleaner exhaust, but formaldehyde deposits on turbine blades possible
Cylinder pressure monitoring: document Pmax spread, establish reference values for methanol

Logbook reference values

Parameter	Expected	Deviation means
Exhaust temperature per cylinder (methanol)	280-360 °C	>25 °C spread: injector problem or pilot fuel timing
Methanol injection pressure	600-700 bar	<580 bar: pump wear; >720 bar: overpressure valve
Cylinder oil consumption	0.5-0.8 g/kWh (BN 25-40)	Too high: scale deposits; too low: accelerated liner wear
Pilot fuel fraction	3-5% of total energy	>8%: methanol injector defective
Crankcase oil mist (OMD)	<2.5% LEL	Rise: methanol leakage through the stuffing box — IMMEDIATE shutdown

Common Failure Modes

Methanol injector coking

Symptoms: Uneven cylinder pressures, increased pilot fuel consumption, T_exh spread

Causes: Pilot fuel residues, Incomplete purge cycle during changeover, Water content in the methanol

Preventive: Check injectors every 4000-6000 running hours, document spray pattern.

Stuffing box leakage

Symptoms: Sweet smell in the crankcase, OMD alarm, viscosity drop in the crankcase oil

Causes: Worn sealing rings, Thermal deformation from fuel switching

Preventive: Log drainage daily, oil analysis every 500 running hours for methanol.

Double-wall pipe fatigue crack

Symptoms: Differential pressure alarm, methanol in the ventilation exhaust air

Causes: Vibration fatigue at connections, Corrosion

Preventive: Vibration analysis every 2500 running hours, flange inspection at port calls.

Expert tips

💡 The S variant has a shorter stroke than the G and therefore lower crosshead loading, but runs at higher speed — the methanol injection window is shorter, timing is more critical.
💡 At part load (<40% MCR) in methanol mode, the pilot fuel fraction rises disproportionately — check part-load optimization in the ECS from both an economic and emissions standpoint.
💡 Methanol bunkering: always check water content (<0.5%), methanol is hygroscopic.

Related components

Turbocharger (adjust cleaning intervals) Methanol bunker tank (N2 inerting) Pilot fuel system (pump, filter, redundancy) Alpha Lubricator (BN changeover) Leak detection system

Classification & regulatory

IGF Code compliance required. Methanol as a low-flashpoint fuel: class approval from DNV, LR, BV or NK with LFPF notation. IMO Tier II in methanol mode without after-treatment; Tier III requires SCR/EGR.

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