柴油发动机备件

Engine block is an integral casting of crankcase and cylinders, in which full-support main bearings are used, and it is made of alloy casting iron. The liner is dry steel with thin wall, the wall thickness is 1.5mm, the liner match the bore through interference (-0.02 -0 mm), divide into three groups, assemble with the same group, the shoulder is 0.05 0.12mm above the top face of the block, the height difference of adjacent cylinder is no more than 0.03mm. To dismantle the liner, must use special tool and press. First measure the diameter of cylinder bore to select matching liner, the required interference must be ensured, then clean inside of cylinder barrel and outside, keep dry, dont apply oil, the pressure should be controlled at 7840N (800kgf) when press in the liner, finally press it firmly with 24500N (2500kgf). Test the water chamber of the block with 392kPa (4kgf/cm2) for 3 minutes, leaking is not allowed. Test the oil passage with 784kPa (8kgf/cm2) for 3 minutes, leaking is not allowed.