MLS Maritime Liner Service
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Technology - Without Dismantling

Measured without opening the cylinder unit

The MarLiner enters through the scavenge air slots and is set down on the piston crown. No liner pulling, no docking, no dismantling - the engine stays assembled.

View straight down a cylinder liner from above: the honed running surface and, at the bottom, the MarLiner measuring head lit on the piston crown
MARLINER IN POSITION - VIEW DOWN THE LINER
Air slots
Access
500-980mm
Liner bore
20-40µm
Reproducibility
Assembled
Engine state

CONVENTIONAL APPROACH

  • Cylinder cover and piston removed
  • Liner pulled or measured by hand gauge
  • Engine out of service for a full shift or longer
  • Few measuring points, operator-dependent
  • Result available days later

MLS IN-SITU MEASUREMENT

  • Cylinder unit stays installed
  • Access through the opened air slots
  • 10 to 30 minutes per cylinder
  • Approx. 12,000 points, automated run
  • Preliminary condition overview onboard

ACCESS

Air slots

The scavenge air receiver is opened and the slots cleaned. Nothing else is disassembled.

POSITION

Piston crown

The unit is set down and self-aligns to the liner axis before the run starts.

CREW

Low effort

Preparation approx. two hours; the measurement itself runs without crew attendance.

Gloved hand guiding the MarLiner measuring head on its rod through an opened scavenge air slot
ACCESS - THROUGH THE AIR SLOT
The head goes in through the slot by hand; the cylinder unit is never opened.
The MarLiner measuring head resting on a piston crown, aligned with its positioning bar
UNIT IN PLACE - ON THE PISTON CROWN
The measuring head is set down and aligned on the piston crown before the run starts.

Terminology

One job, several names

Fleets, engine makers and class surveyors do not all use the same words for this work. They describe the same measurement, and MLS delivers it under any of them.

Liner diameter measurement (LDM)
The measurement itself: the internal diameter of the liner, recorded at defined levels down the bore. The term used in most engine-maker documentation.
Cylinder liner measurement · liner wear measurement
The everyday names in the engine room. Wear is the difference between the measured diameter and the nominal bore, so the two are the same reading.
3D liner mapping
What the MarLiner adds: not single points in one direction, but a closed surface over the whole bore, which is what makes ovality visible.
In-situ / onboard measurement
How MLS does it: with the cylinder unit installed and the vessel alongside, through the scavenge air slots.
500-980 mm
Liner bore range
approx. 12,000
Points per liner
20-40 µm
Reproducibility
10-30 min
Per cylinder
2-4 h
Per inspection

Values are indicative and stated within the present inspection scope. Final maintenance decisions remain subject to engine-maker instructions.

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

NEXT STEP

ROSTOCK · WORLDWIDE
CONFIRMATION USUALLY WITHIN ONE WORKING DAY

No liner pulling required - send your port and ETA.

Request inspection availabilityor book a 15-minute intro call

LEONARD GAU · MANAGING DIRECTOR
+49 381 000 0000 · INFO@MLS-SERVICE.DE