KNOW YOUR WEAR. PROTECT YOUR ENGINE.

Cylinder liner measurement
without opening the engine.

3D liner diameter measurement in situ - through the scavenge air slots, with the cylinder unit installed and the vessel alongside. Returned as a structured condition report for every cylinder.

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LICENSED MARIDIS PARTNERMARLINER SYSTEMNO DISMANTLING

Liner Measurement

3D wear, ovality and wear rate for every cylinder - measured through the air slots in 10 to 30 minutes per unit, no dismantling.

Explore the service

Full Inspection

Piston crown, ring pack, groove clearance, lubrication and scavenge air space - documented in the same attendance.

Explore the add-on

500-980mm
Liner bore: 3,313
Readings / revolution: 10-30min
Per cylinder: Worldwide
Attendance

Measure.

Approx. 12,000 points per liner, recorded in situ through the air slots. The cylinder unit stays installed.

Classify.

Wear, wear rate and ovality per cylinder, stated against applicable engine-maker criteria.

Decide.

One report as the basis for docking and budget planning. Indicative trend where sufficient data are available.

500-980 mm BORE 12,000 POINTS / LINER 3,313 READINGS / REVOLUTION 20-40 µm REPRODUCIBILITY 10-30 min / CYLINDER WEAR · OVALITY · WEAR RATE 2-4 h / INSPECTION

01 - THE GAP

Know the actual condition between overhauls.

Overhauls provide a snapshot at a single point in time. Between the intervals, wear, ovality and ring condition continue to develop - without any measured record. MLS closes that gap.

Between two overhauls Schematic, not to scale

Overhaul - one snapshot in time
Between intervals - no measured record
MLS - measured in situ, unit installed

20-40 µm reproducibility across repeat measurements 12,000 measuring points per cylinder liner

02 - WHAT WE DO

One attendance, five ways it pays off

Every service starts from the same measured surface. What changes is how far the evidence is carried - from a single liner profile through to a full condition report for the shore organisation.

All services →

Liner Measurement 3D wear, ovality and wear rate for every cylinder - measured through the scavenge air slots with the unit installed, 10 to 30 minutes per liner. Explore the service Full Inspection Piston crown, ring pack, groove clearance, lubrication and scavenge air space - documented in the same attendance. Explore the add-on Condition Reporting Wear, wear rate and ovality per cylinder against the engine-maker criteria, in one structured PDF for ship and shore. See the report Measuring Technology Laser triangulation at 1,000 Hz, temperature-compensated, with the device logging its own tilt and eccentricity. How it measures Compatibility Check Three inputs tell you whether in-situ access through the air slots applies to your engine - no account required. Check your engine

03 - ONE PORT CALL

Everything happens alongside.

Pick a point on the berth to see what happens where - from the first check of your engine to the report that goes ashore. The vessel stays in port, the cylinder units stay installed.

Aerial view of an offshore jetty with two tankers alongside, a small gas carrier and a larger tanker, pipeline trestle running to shore

01 / 05

01 · Compatibility

Is your engine a fit?

In-situ access through the scavenge air slots applies to two-stroke main engines with liner bores from 500 to 980 mm. Three inputs in the compatibility check give you the answer - no account required.

Liner bore: 500-980 mm
Inputs to an answer: 3

Check your engine

02 · Alongside

Measured at the berth, not in dock.

The attendance fits into a regular port call. The crew opens and cleans the access approx. two hours ahead - no docking, no dismantling of the cylinder unit.

Per inspection: 2-4 h
Preparation ahead: ≈2 h

See the process

03 · Liner measurement

Through the scavenge air slots.

The MarLiner head goes in through the air slots and sits down on the piston crown. An automated run reads the liner wall level by level: 3D wear, ovality and wear rate for every cylinder.

Per cylinder: 10-30 min
Points per liner: 12,000

Explore the service

04 · Full Inspection

The rest of the unit, same attendance.

While the access is open anyway: piston crown, ring pack, groove clearance, lubrication and the scavenge air space, documented alongside the liner data.

Whole engine, with the add-on: 4-8 h

Explore the add-on

05 · Report ashore

One report for ship and shore.

A preliminary condition overview before departure, then the structured PDF: wear against the limit, wear rate, ovality and indicative remaining hours, cylinder by cylinder.

Working days to the PDF: 5
Full circumference per level: 360°

See the report

04 - Inside the measurement

Not an estimate. A measured surface.

The MarLiner laser head turns on the piston crown and reads the liner wall at 1,000 Hz - 3,313 readings per revolution, repeated level by level up the liner. What comes out is a full 3D surface, not eight caliper points.

MarLiner software on a monitor showing the reconstructed 3D wear surface of a cylinder liner, colour-mapped by wear from 0.4 to 4.4 millimetres — 3D WEAR SURFACE - COLOUR-MAPPED 0.4 … 4.4 MM MARLINER SOFTWARE

0.38mm

Maximum measured wear - 9.5 % of the 4 mm limit for this bore.

0.022mm/1000 h

Wear rate, derived from wear against logged liner running hours.

0.18mm

Maximum ovality - the figure a single-direction gauge cannot see.

164,545h

Indicative remaining liner life at the measured rate.

Wear diagram in the MarLiner software on a monitor: wear in millimetres plotted against depth from bottom dead centre, for the fore-aft and exhaust-manoeuvre directions — WEAR OVER DEPTH · F-A AND E-M

Polar wear diagram in the MarLiner software on a monitor, showing the measured liner circumference against the 50 percent and 100 percent wear limit circles — POLAR VIEW · AGAINST WEAR LIMITS

Raw laser data in the MarLiner software on a monitor: distance against angle over the full 360 degrees for a single measuring level, with the device values alongside — RAW LASER DATA · 360° PER LEVEL

Every level is temperature-compensated for the thermal expansion of both the liner and the device.
The device logs its own eccentricity and tilt and rejects a run outside ±30 mm / ±2°.
Diameters are recorded in two directions - fore-aft and exhaust-manoeuvre - so ovality is a measurement, not an assumption.

Figures from a reference measurement on a MAN B&W 6S50MC-C, 500 mm bore, 16,912 liner hours. Vessel identification removed. Remaining life is an indicative projection at the measured wear rate, not a guarantee.

05 - Condition report

Which liner needs attention, and when.

Every attendance ends in one structured report for ship and shore: wear against the limit for the bore, wear rate, ovality and the indicative remaining hours - worked out from wear over depth in both directions, the polar view and a 3D surface of every liner. Cylinder by cylinder, in the same layout every time.

360°Full circumference, read level by level up the liner
10Depth levels overlaid in one polar view
4Sides of the 3D surface, 90° apart

MLS service report page on a monitor: cylinder 1 wear condition with wear over depth in the fore-aft and exhaust-manoeuvre directions, the polar view against the wear limits and the 3D liner surface from four sides

3D surface diagram

Four sides of the same liner.

The report turns every liner through 0°, 90°, 180° and 270°, colour-mapped by wear. Local wear at the lubrication points or around the ports shows up as a change of colour - where it sits, not only how deep it goes.

Page 1 of a MarLiner cylinder condition report on a monitor: wear diagrams for both directions, polar view and the summary line with max wear 0.38 mm, wear rate 0.022 mm per 1000 hours, ovality 0.18 mm and 164,545 remaining hours — **Cylinder condition report, page 1 of 2.** The figures in section 04 come from this page: max wear 0.38 mm, wear rate 0.022 mm/1000 h, ovality 0.18 mm, 164,545 h remaining.
How to read the report

06 - Process

Seven steps, one attendance.

With the enquiry

Step 01 Configuration Check. Vessel, engine and configuration data are recorded. This is where the enquiry starts.
Approx. 2 h ahead

Step 02 Vessel Preparation. Access opened and cleaned, approx. two hours before the measurement.
Through the air slots

Step 03 MarLiner Positioning. Inserted through the air slots and set down on the piston crown.
Core step · 10-30 min

Step 04 Liner Measurement. Automated run, 10 to 30 minutes per cylinder, approx. 12,000 points.
Before departure

Step 05 Data Processing. Evaluation onboard, with a preliminary condition overview before departure.
Optional add-on

Step 06 Full Inspection Add-On. Piston, ring pack, lubrication, deposits and scavenge air space.
Within 5 working days

Step 07 Final Report. Structured PDF for the vessel and the shore organisation.

The full process

07 - BACKGROUND

Wear patterns, and where the method comes from

The measurement only means something against the damage it is meant to catch. These are the patterns we look for on the running surface - and the system the readings come from.

Knowledge base →