The Weichai generator piston and piston pin adopt clearance fit. When assembling, place the small end of the connecting rod in the middle of the two pin holes of the piston. Note that the forward arrow marks on the connecting rod are in the same direction. Put the pin into the pin hole, tap it lightly with a soft metal hammer or a wooden hammer, and then install the retaining ring. After installation, the piston and connecting rod should be able to swing freely without blocking phenomenon, and then install the piston ring. When installing the piston ring, the side with the marked surface should face up, and it is best to use special tooling.
There are three piston rings on each piston of Weichai generator. The first one is a gas ring, which is mainly used to seal high temperature and high pressure gas. High temperature wear resistance, with good anti-bonding snap ring effect. The second ring is the oil scraping ring, which is a conical surface ring, which mainly plays the role of sealing gas and scraping oil. The third channel is the oil ring part, which is a combined ring and mainly plays the role of scraping oil. In order to ensure the sealing performance, the axial clearance and closing clearance of the piston ring must meet the specified values in Table 1. The method of measuring the closed gap is to place the piston ring flat in the cylinder liner hole (the piston can be flattened), and measure the gap at the closed opening of the ring with a thickness gauge.
When the Weichai generator piston connecting rod is assembled into the cylinder liner, the arrow on the top of the piston must point to the front end of the engine, and the openings of the three piston rings should be staggered to ensure the sealing performance. When assembling the connecting rod bolts, it should be possible to screw the connecting rod bolts to the end by hand, and then tighten them with a torque wrench. The tightening torque of the connecting rod bolt is 160+/-10n.m, and it needs to be tightened evenly in three times. After tightening, ensure that the crankshaft rotates flexibly, and the piston is an internal cooling oil channel piston, which is cooled by spraying oil through the piston cooling spray hook to ensure that the piston is effectively cooled without overheating.
The cooling spray hook of Weichai generator must go through the target test to ensure that the oil can be sprayed into the oil passage of the piston. The second gear of the crankshaft is equipped with a thrust plate to prevent the crankshaft from moving forward and backward, and the axial clearance of the crankshaft must be guaranteed to be 0.102- 0.305mm.
Weichai generator flywheel and crankshaft rear flange are positioned and assembled. When assembling, pay attention to keep the joint surface clean and intact. The solid bolts of the flywheel should cross diagonally and tighten evenly in several times. The tightening torque is 200+/-20n.m.
The crankshaft pulley shock absorber is combined with the crankshaft with bolts, the bolts cross diagonally, and the tightening torque is 110+/-10n.m.
There are three piston rings on each piston of Weichai generator. The first one is a gas ring, which is mainly used to seal high temperature and high pressure gas. High temperature wear resistance, with good anti-bonding snap ring effect. The second ring is the oil scraping ring, which is a conical surface ring, which mainly plays the role of sealing gas and scraping oil. The third channel is the oil ring part, which is a combined ring and mainly plays the role of scraping oil. In order to ensure the sealing performance, the axial clearance and closing clearance of the piston ring must meet the specified values in Table 1. The method of measuring the closed gap is to place the piston ring flat in the cylinder liner hole (the piston can be flattened), and measure the gap at the closed opening of the ring with a thickness gauge.
When the Weichai generator piston connecting rod is assembled into the cylinder liner, the arrow on the top of the piston must point to the front end of the engine, and the openings of the three piston rings should be staggered to ensure the sealing performance. When assembling the connecting rod bolts, it should be possible to screw the connecting rod bolts to the end by hand, and then tighten them with a torque wrench. The tightening torque of the connecting rod bolt is 160+/-10n.m, and it needs to be tightened evenly in three times. After tightening, ensure that the crankshaft rotates flexibly, and the piston is an internal cooling oil channel piston, which is cooled by spraying oil through the piston cooling spray hook to ensure that the piston is effectively cooled without overheating.
The cooling spray hook of Weichai generator must go through the target test to ensure that the oil can be sprayed into the oil passage of the piston. The second gear of the crankshaft is equipped with a thrust plate to prevent the crankshaft from moving forward and backward, and the axial clearance of the crankshaft must be guaranteed to be 0.102- 0.305mm.
Weichai generator flywheel and crankshaft rear flange are positioned and assembled. When assembling, pay attention to keep the joint surface clean and intact. The solid bolts of the flywheel should cross diagonally and tighten evenly in several times. The tightening torque is 200+/-20n.m.
The crankshaft pulley shock absorber is combined with the crankshaft with bolts, the bolts cross diagonally, and the tightening torque is 110+/-10n.m.
When installing the oil pump of Weichai generator, use tooling to ensure the coaxiality between the front oil seal mounting hole on the oil pump and the crankshaft. If there is no tooling, the coaxiality must be checked. It is easy to cause the failure of the oil pump rotor to crack.
