  First, inspection and repair
　　
1. Drive gear and the main, driven gear tooth surface or both inside and outside the rotor surface burrs can be polished with Whetstone, such as gear tooth flaking or gap should be replaced.
　　
2. Gear oil pump main and driven gear meshing gap is too large, it will affect the pump oil pressure, the measurement can be used to measure the thickness of each other in 1200 points three points test. The normal meshing clearance should be 0.08 ~ 0.20mm, the maximum does not exceed 0.75mm, and the measurement of the gap does not exceed 0.10mm, more than the main and passive gears should be replaced.
　　
Rotor-type oil pump rotor shaft and bushing wear gap exceeds 0.10mm, the need to replace the bushing. Boring holes can also be used to set the way to restore its standard with the gap.
　　
Inset repair, should pay attention to keep the eccentric rotor outer rotor unchanged, otherwise the fuel supply will have a greater impact.
　　
3. Oil pump cover face wear is too large, will also affect the pump oil pressure, available steel rule and thickness gauge inspection, the depth of the dent not less than 0.05mm wear, if more than can be flat on the pump cover Valve sand grinding flat so far. If it is larger than 0.10mm, it can be leveled on the lathe and then polished; it can also be polished on a surface grinder. The housing end surface can be milled on a milling machine (or grinding machine) to a small amount and then ground on a platform.
　　
4. Limit pressure spring is too soft or ball valve wear, not round, pitted too much, closed lax phenomenon, should be replaced.
　　
5. Inner rotor cross pin loose or pinch gear pin loose, should be replaced.
　　
6. Install the dial indicator to measure the pump shaft and shake it by hand to check its looseness. The clearance between the oil pump shaft and the shell is generally 0.03 ~ 0.08mm. If it exceeds 0.16mm, the pump shaft should be replaced.
　　
7, check the pump shaft end clearance, usually 0.03 ~ 0.08mm, thickness gauge measuring the gap between the rear end of the pump housing and drive gear, such as more than 0.12mm, remove the transmission gear, gear and pump casing at the end Reinforcement between the appropriate thickness of the steel gasket adjustment.
　　
8. Oil pump driven gear and shaft with the gap is generally 0.02 ~ 0.05mm, the maximum does not exceed 0.15mm.9. Drive shaft bending, dial indicator can be used to check the pointer deviation can not exceed 0.06mm, should be corrected when it exceeds .
　　
Second, the assembly of the oil pump
　　
1. Gear oil pump assembly points
　　
Assembly, pump and pump cover should ensure the completeness, shall not be confused. When the driving gear shaft is pressed into the driving gear, the hot gear method should be adopted. When the driving gear should be uniformly heated to 150 ℃ ~ 200 ℃, the driven gear shaft should be pressed in. The driven gear shaft Press into the oil pump housing. The depth of the shaft into the shell break off the value of the value should be consistent with the provisions of the corresponding bushing were pushed into the passive gear, pump housing and the back cover, the bushing should not protrude gear both ends, the pump cover end and the pump chamber bottom plane After the gear pair is installed in the housing, the clearance between the end face, the top of the tooth and the clearance between the pump and the flank of the tooth should meet the technical requirements; the assembled oil pump should be operated flexibly and without jamming. Pressure limiting valve in the valve body should be able to move freely, by its own weight should be able to freely seated, closed tightly; oil filter should be intact, if damaged allows the use of solder plug, but the solder plugging area of ​​not more than 10% .
　　
Rotor oil pump assembly
　　
Rotor-type oil pump installation of the outer rotor, the outer rotor should be chamfered side of the first face into the shell, after installation, turn the inner rotor, check the rotation is flexible.
　　
Run-in test
　　
The installed oil pump should run on the oil pump test bench running test. Run in the first run at rated speed without load operation 4min, and then gradually increase the load to the standard pressure for 3min, run-in should be no noise, overheating and oil leakage, run-in inspection of repaired oil pump to achieve the required performance indicators.
　　
1. Drive gear and the main, driven gear tooth surface or both inside and outside the rotor surface burrs can be polished with Whetstone, such as gear tooth flaking or gap should be replaced.
　　
2. Gear oil pump main and driven gear meshing gap is too large, it will affect the pump oil pressure, the measurement can be used to measure the thickness of each other in 1200 points three points test. The normal meshing clearance should be 0.08 ~ 0.20mm, the maximum does not exceed 0.75mm, and the measurement of the gap does not exceed 0.10mm, more than the main and passive gears should be replaced.
　　
Rotor-type oil pump rotor shaft and bushing wear gap exceeds 0.10mm, the need to replace the bushing. Boring holes can also be used to set the way to restore its standard with the gap.
　　
Inset repair, should pay attention to keep the eccentric rotor outer rotor unchanged, otherwise the fuel supply will have a greater impact.
　　
3. Oil pump cover face wear is too large, will also affect the pump oil pressure, available steel rule and thickness gauge inspection, the depth of the dent not less than 0.05mm wear, if more than can be flat on the pump cover Valve sand grinding flat so far. If it is larger than 0.10mm, it can be leveled on the lathe and then polished; it can also be polished on a surface grinder. The housing end surface can be milled on a milling machine (or grinding machine) to a small amount and then ground on a platform.
　　
4. Limit pressure spring is too soft or ball valve wear, not round, pitted too much, closed lax phenomenon, should be replaced.
　　
5. Inner rotor cross pin loose or pinch gear pin loose, should be replaced.
　　
6. Install the dial indicator to measure the pump shaft and shake it by hand to check its looseness. The clearance between the oil pump shaft and the shell is generally 0.03 ~ 0.08mm. If it exceeds 0.16mm, the pump shaft should be replaced.
　　
7, check the pump shaft end clearance, usually 0.03 ~ 0.08mm, thickness gauge measuring the gap between the rear end of the pump housing and drive gear, such as more than 0.12mm, remove the transmission gear, gear and pump casing at the end Reinforcement between the appropriate thickness of the steel gasket adjustment.
　　
8. Oil pump driven gear and shaft with the gap is generally 0.02 ~ 0.05mm, the maximum does not exceed 0.15mm.9. Drive shaft bending, dial indicator can be used to check the pointer deviation can not exceed 0.06mm, should be corrected when it exceeds .
　　
Second, the assembly of the oil pump
　　
1. Gear oil pump assembly points
　　
Assembly, pump and pump cover should ensure the completeness, shall not be confused. When the driving gear shaft is pressed into the driving gear, the hot gear method should be adopted. When the driving gear should be uniformly heated to 150 ℃ ~ 200 ℃, the driven gear shaft should be pressed in. The driven gear shaft Press into the oil pump housing. The depth of the shaft into the shell break off the value of the value should be consistent with the provisions of the corresponding bushing were pushed into the passive gear, pump housing and the back cover, the bushing should not protrude gear both ends, the pump cover end and the pump chamber bottom plane After the gear pair is installed in the housing, the clearance between the end face, the top of the tooth and the clearance between the pump and the flank of the tooth should meet the technical requirements; the assembled oil pump should be operated flexibly and without jamming. Pressure limiting valve in the valve body should be able to move freely, by its own weight should be able to freely seated, closed tightly; oil filter should be intact, if damaged allows the use of solder plug, but the solder plugging area of ​​not more than 10% .
　　
Rotor oil pump assembly
　　
Rotor-type oil pump installation of the outer rotor, the outer rotor should be chamfered side of the first face into the shell, after installation, turn the inner rotor, check the rotation is flexible.
　　
Run-in test
　　
The installed oil pump should run on the oil pump test bench running test. Run in the first run at rated speed without load operation 4min, and then gradually increase the load to the standard pressure for 3min, run-in should be no noise, overheating and oil leakage, run-in inspection of repaired oil pump to achieve the required performance indicators.
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