In order to withstand the extreme combustion temperatures generated in high performance two-stroke diesel engines, the exhaust valves must be manufactured from special alloys. The traditional material used in the manufacture of 2-stroke exhaust valves is stainless steel with a stellite layer inserted into the seating face. Later generation engines are fitted with exhaust valves manufactured from solid nimonic material. The high material cost of exhaust valve spindles and seats makes reconditioning a very attractive commercial proposition provided that it is carried out in a controlled manner.
The process for reconditioning exhaust valve spindles involves the following steps:
DMI is also able to recondition exhaust valve seats for all types of engines. This is done by removing the existing stellite layer, building up seating area followed by re-stelliting, machining and grinding to original profiles.
Exhaust Valve Spindles
Exhaust Valve Seats
Exhaust Valve Seat
Exhaust Valve Spindle