What problems should be paid attention to in cylinder block processing

Some precautions should be taken when machining the upper plane of the cylinder block:

1. Before processing, check the data that the upper plane of each cylinder liner is higher than the upper plane of the cylinder block, and measure the depth of the cylinder liner bearing hole stopper.

2. After processing, check the parallelism between the upper plane of the cylinder block and the lower plane of the cylinder block (to prevent uneven stress on the support shoulder of the cylinder liner of individual cylinders due to excessive parallelism).

3. If the stop table of the cylinder liner bearing hole is also processed at the same time, it is also necessary to measure its parallelism with the lower plane of the cylinder block. And because the center distance of the engine connecting rod is fixed, it means that the piston may be higher than the upper plane of the cylinder liner when it reaches the top dead center position. At this time, the compression ratio of the engine should be recalculated and matched accordingly. Thick cylinder head gasket to restore the normal power of the engine.

4. If the compression ratio is not calculated and a thinner cylinder head gasket is selected (without affecting the force on the support shoulder of the cylinder liner), due to the increase of the compression ratio, the engine may work rough after maintenance, and even the piston may be ablated. Phenomenon. Then you can appropriately reduce the oil supply of the oil pump, increase the oil supply advance angle (fine-tuning), reduce the engine power, and ensure the normal use of the engine