This VM Motori engine is fitted to this type of Flygt pump and is used to move large quantities of naturally draining water that accumulates in quarries. The engine was collected from a quarry in Leicestershire to have an overheating problem looked at and also it being under-powered. It transpired that the engine had been previously rebuilt by a workshop and the fuel injection timing and the valve timing was incorrectly set. Compression test readings showed the cylinder pressures to be too low and after the cylinder heads were removed we discovered that the exhaust valve seats were badly burnt and the inlet valves were deformed because of the excessive heat. In addition, the spray pattern of the fuel injectors were not as good as they should have been so after resetting the timing of the valves, injection pumps and reconditioning the injectors along with fitting new valve seats and valves, the engine then ran very well and pumped water out of the quarry very successfully.
On this type of engine, with individual fuel pumps, you have to use the ‘spill timing method’ and the valve timing has to be set with a degree disk.
In addition, we did some remedial work to the cool air ducting inside the canopy along with steam cleaning the cylinder barrels, cylinder heads and the oil cooler. After the engine was serviced, it was returned to the quarry and put back into use.