New cylinder liner honing procedure – watch video
New cylinder liner honing procedure for MAN 4-stroke small-bore cylinder liners, developed by MAN Holeby and Chris-Marine. Don’t miss the opportunity to watch the instruction video.
The procedure applies for the following MAN engine types:
MAN L28/32DF, V28/32S, L28/32S, L27/38S, L27/38, L23/30DF, L23/30S, L23/30HMk3, L23/30H-Mk2, L23/30H, L21/31S, L21/31-Mk2, L21/31, L16/24S and L16/24.
Watch the instruction video here: MAN 4-stroke small-bore medium speed honing procedure of cylinder liner – YouTube
MAN 4-stroke small-bore medium-speed cylinder liner honing procedure.
Why honing?
The honing process rectifies longitudinal and circumferential surface geometry, thus restoring the cylinder liner’s oil retaining surface properties. Honing is vital to prolong the lifetime of cylinder liners and avoid running-in problems. If honing isn’t performed regularly there is a risk that the maximum wear limit provided by the engine makers won’t be reached before cylinder condition issues occur. Some common cylinder condition problems are broken piston rings and cylinder scuffing.
The results
The honing result depends on several process parameters such as honing speed, stone pressure, and number of strokes for each stage. Different types of stones are used throughout the process and up to five surface roughness parameters and several more geometrical parameters should be within a pre-specified range at the end of the honing process. This means that monitoring and controlling the process is challenging also for quite experienced users. Chris-Marine has therefore developed the Chris-Marine Honing App, a tool intended to make it easier to monitor and control the honing process, thereby improving quality while also saving time.
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