There is a spring just underneath the cylinder cover and on top of the suction valve seat. This is to prevent the liquid refrigerant to enter the compressor and causing damage, or oil entering the compressor. So when liquid is returned to the compressor, then this spring will force the VALVE SEAT to be raised preventing any damage to the head. Further, when the difference between the internal cylinder pressure and high pressure increases more than 3 Kg/cm2, this spring lifts up the VALVE SEAT.
The electrohydraulic control mechanisms of the ME engine replace the following components of the conventional MC engine: Chain drive for camshaft Camshaft with fuel cams, exhaust cams and indicator cams Fuel pump actuating gear, including roller guides and reversing mechanism Conventional fuel pressure booster and VIT system Exhaust valve actuating gear and roller guides Engine driven starting air distributor Electronic governor with actuator Regulating shaft Engine side control console Mechanical cylinder lubricators. The Engine Control System of the ME engine comprises: Control units Hydraulic power supply unit Hydraulic cylinder units, including: Electronically controlled fuel injection, and Electronically controlled exhaust valve activation Electronically controlled starting air valves Electronically controlled auxiliary blowers Integrated electronic governor functions Tacho system Electronically controlled Alpha lubricators