One of our core services is engine honing. Honing becomes desirable, when rings and liners are suffering from scuffing. In such cases, the first priority is to find and eliminate the reason for the scuffing. After this is accomplished, the question whether to recondition the liners has to be solved.

Recent development in tool design resulted in honing tools, which make it possible to hone large liners (including the 90 bore types) while they are still installed in the engine. 

The honing equipment used has been manufactured by “Chris Marine”. The head of the honing device consists of four synchronized stones. For the initial honing diamond stones are used to break up the hardened surface in the scuffed areas. For the main honing very coarse and hard stones are used to produce a very desirable rough surface all over the liner.

The advantage, especially for the 2-stroke engines, is possibility to save the liner after a seizure, scuffing or blow-by or even to eliminate the ovality of the liner. Another advantage is, that it is possible to machine a rough linerwall to obtain a well oiled surface.

With our honing equipment, liners with a diameter of 200 mm up to 980 mm can be machined. Honing of liners of 4-stroke engines is mostly carried out in our workshop and honing of cylinder liners of 2-stroke engines is mostly done on site in order to reduce overhaul time.