Actual Results of Cylinder Liner Wear On Recent Low Speed Marine Diesel Engine

Abstract

This paper shows the actual circumstances, mentioned below, of cylinder liner wear and piston overhauled data of marine diesel engine, installed the recent low speed and long stroke type. JAPANESE SHIP OWNER'S ASSOCIATION offered the most of these data in addition to MITSUI O.S.K. LINES'.
1. ANALYSIS RESULTS ON THE ENGINE WORKING HOUR BASIS
1. Excessive liner wear are found in early stage within about 10, 000 working hour on “A” and “B” engine type respectively.
2. Generally speaking, ordinary liner wear rate is said to be less than 10/100 mm per 1000 working hour through conventional technical experience.
But this analysis data of liner wear rate indicates over 20/100 mm per 1000 working hour on both “A” and “B” engine type excluding “C”.
2. ANALYSIS RESULTS ON THE ENGINE POWER BASIS
1. The cylinder oil feeded rate of “A” “B” and “C” engine type is taken in the recommended value of engine maker concerned, prus more than 0.2-0.4g/ps/h at 30-60% working load of catalog MAX M.C.R. being ordinary using load.
2. However, excessive liner wear on “A” engine type supplied above feeded rate is characteristic of occuring at the point of 50-60% working load of catalog MAX M.C.R.