1 The fuel supply switch leaks because of the damage of the graphite and asbestos seals at the switch. Exclude: 1.1 Remove the switch, remove the packing, use oil-proof rubber sheet to make two round pads with outer diameter larger than the switch housing hole by 1 mm and inner diameter larger than the handle screw by 1.5 mm, and then clamp the rubber pad in the middle of the steel pad, then Put it on the handle screw and tighten the capping device. 1.2 Wrap the graphite and asbestos ropes between the two steel pads and fill them. Tighten the capping device. 2. The cause of oil leakage from the fuel tank tap is due to the failure of the steel ball rust in the faucet. Exclusion: Replace the steel ball (15 mm in diameter and replace the ball in the bearing with an internal diameter of 80 mm). 3, oil pipe bell mouth oil leakage is because the tubing bell mouth cone and bellmouth seat seal is not good. Exclusion: 3.1 Screw joints First screw a horn. 3.2 After grinding the bell mouth joint, apply a sealant on the cone surface, and then tighten or saw the bell mouth and re-expand one with the expander. 4 The reason for the oil leakage of the hollow screw joint is: 4.1 The end face of the oil pipe joint and the gasket are uneven; 4.2 The screw holes on the housing are uneven. The elimination method is as follows: Smooth the joints and washers. Place the cannulated screws in the inner surface of the car and tighten or apply sealant on both sides of the gasket. 5 The reason for oil leakage at the joint surface of the housing is that the oil leakage at the joint surface of the housing such as the oil pan, cylinder head, valve cover, timing gear chamber cover, transmission cover, starter gear cover, etc. The firmware was not tightened, the gasket was damaged or failed. Remedy: 5.1 Always do a tightening job. 5.2 For infrequently disassembled parts such as paper pads, if the paper pad area is small, a layer of lead oil may be applied on both sides of the paper pad (soaked in diesel oil before oil coating); if the paper pad area is large, Apply a grease on both sides of the paper pad. 5.3 As for the frequently dismantled parts such as the valve room cover and the filter housing, an asbestos mat shall be used and the mat shall be coated with lead oil. When tightening, the bolts at the location should be symmetrically tightened several times. In addition, it should be ensured that the gaskets are intact and the joint surfaces of the parts are clean and without any misalignment and deformation of the parts. 6 The reason for oil leakage at each joystick shaft is: 6.1 The gasket is damaged. 6.2 The clearance between the shaft and the hole increases. Exclusion: According to the diameter of the rod shaft, a suitable oil-resistant rubber gasket can be selected. The inner diameter of the gasket is smaller than the shaft diameter by 1 to 3 mm, and it can be pressed tightly on the shaft surface that is in contact with the hole wall. 7 Crankcase leak oil is caused by: Damaged paper pad or loose screws. Exclusion: Remove the crankcase cover, remove the gasket and check. If the gasket is intact, it can be wiped and coated with a layer of lead oil. After drying, it can be installed. If it is damaged, it should be replaced with a new one. Washers should be soaked in diesel for 20 minutes before installation, then coated with a layer of lead oil. Screws should be tightened symmetrically and evenly. 8 The reason for oil leakage from high-pressure tubing is that after the long-term use of the high-pressure tubing, the tapered surface of the joint has worn out, resulting in lax sealing. Exclude: Put a plastic tube with a length of 1--2 mm and a diameter of about 5 mm in the fitting area of ​​the high pressure oil pipe cone and the taper hole, or pad a copper gasket with an inner diameter slightly larger than the inner diameter of the oil pipe and an appropriate outer diameter, or replace the new high pressure. Tubing. 9 gearbox leakage gear oil reasons are: 9.1 gearbox bearings and shaft holes with a large gap; 9.2 oil seal wear and aging. The exclusion method is as follows: The clearance of the shaft hole of the box is too large and can be repaired by inserting. If oil leakage occurs due to wear and aging of the oil seal, replace the oil seal. Reasons for oil leakage on the 10 rollers, carrier rollers and guide rollers are as follows: 10.1 The rubber seal sleeve is worn and aged; 10.2 The seal ring is seriously worn. Remedy is as follows: Replace rubber seals in time. Replace the upper seal ring. The two rough mating surfaces of the seal ring must be properly ground and coated with a layer of graphite grease on both sides. Do not allow water and dirt to enter for 24 hours after mounting. 11 Oil leakage at the oil inlet and drain port is caused by: 11.1 The screw threads and pitch of the seals in the diesel tank, gasoline tank, hydraulic oil tank, diesel filter, high pressure oil pump, oil pan, and transmission are inconsistent. 11.2 The lid of the diesel tank is not sealed. The exclusion method is as follows: The screw and pitch of the seal should be the same, all adopt the fine buckle. Install sealing rubber.