D7D Volvo Excavator Parts Engine Piston Overhaul Kit engine Rebuild Kit

Engine Spare Parts D7D Piston Overhaul Kit Piston Piston Set for Mistubishi

The composite material is now applied to the surface of the smaller test piston so that the clearance between the piston skirt and the cylinder wall is close to zero. Wear mark test was carried out at the maximum power of the engine.

The profile determined by the composite material left after the test is taken as the final piston profile. In this way, only one abrasion test is needed to determine the best piston profile. In addition, the wear strength can be quantitatively analyzed from the wear marks of the piston.

Seven, piston skirt structure

The piston skirt should not only bear the lateral thrust of the connecting rod, but also ensure the good guidance of the piston, so there should be sufficient pressure area to form a sufficient thickness of the lubricating oil film.

Neither because the gap is too large and cylinder knocking, resulting in noise and accelerated wear and also because the gap is too small and cylinder pulling. The tendency is to use thin - walled reinforcement, both to reduce weight and ensure sufficient stiffness to prevent deformation.

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