Cylinder head gasket If there are oil holes, they must […]
Cylinder head gasket
If there are oil holes, they must be aligned with the corresponding oil passage holes on the body and cylinder head to avoid friction caused by the oil cut-off of the valve mechanism on the cylinder head. There is no oil passage hole and the front and back shapes are the same, which is determined by the material of the cylinder head: for aluminum alloy cylinder heads, the curled side of the cylinder head should face the cylinder block; for cast iron cylinder heads, the curled side of the cylinder head should face the cylinder head .
Pistons and piston rings
Pistons with an upward arrow mark on the top should be installed in the direction specified by the mark; if there is no mark, the vortex pit or the small notch beside the pit on the top of the piston should be directed to the side of the injector to ensure uniform gas mixing. When assembling the piston ring, the top with marks such as UP, UP, etc. should be facing upwards; for twisted rings with no marks on the top, the internal notch or chamfer should be facing downwards; the chrome-plated ring (with shiny shell) should be installed in the first channel In the piston ring groove, each ring opening should be staggered by 120 to 180 degrees to ensure its sealing effect.
Connecting rod and connecting rod cover
The connecting rod of the Dongfanghong horizontal diesel engine is divided by 45 degrees, and the section should be downward to improve the force of the connecting rod bolt. The connecting rod cover and the connecting rod are matched. The matching marks should be on the same side when assembling to ensure that the roundness and cylindricity of the connecting rod bearing meet the specified requirements.
Main bearing cap, bearing shell, bushing
Both the main bearing cap and the housing of the machine body are processed by paired boring, and they should be seated according to the matching marks. The assembly direction should not be interchanged or changed at will, so as not to damage the coaxiality and dimensional accuracy of the main bearing seat hole. Bearing bushes or bushings with oil holes should be aligned with the corresponding oil passage holes on the bearing seat and bushing holes to ensure unobstructed oil passage.
The drive forks at both ends should be in the same plane to avoid torsional vibration and damage to the drive components. If the drive chain adopts spring clamps, the direction of the opening end should be opposite to the direction of chain movement to avoid falling off due to collision during movement.
If there is an upward arrow mark, it should point to the direction of rotation of the tire when moving forward; if there is no mark, the top of the figure eight or herringbone pattern should face up when the driving wheel is viewed from the back of the locomotive.
If one end is a coarse thread and the other end is a fine thread, the coarse thread end should be screwed into the body; if the two ends of the bolt are fine threads, the shorter end should be screwed into the body to ensure that the cylinder can be screwed The cover is pressed tightly.
Oil pump and fuel injection pump
The oil uses planetary rotor type, the outer rotor should be chamfered towards the pump body, so as to prevent the oil from circulating in the pump and lowering the pump oil pressure. The crescent-shaped positioning groove on the injector shaft plug sleeve should be aligned with the positioning hole on the pump body, and the mark on the plunger (or oil return groove) should be installed upwards to avoid no fuel supply or diesel engine runaway.