Contents: Checking the pressure reducing valve ↓ Checking the shaft and gear of the…↓ Checking the oil pump drive shaft…↓ Checking the oil pump drive gear…↓
Basic data for checking the pressure reducing valve spring
1. After disassembling, wash all pump parts with kerosene or gasoline, blow with a stream of compressed air, and then inspect the pump body and cover; if there are cracks, replace the parts.
2. Using a set of feeler gauges, check the gaps between the gear teeth, as well as between the outer diameters of the gears and the walls of the pump body, which should be 0.15 mm, respectively (maximum permissible 0.25 mm) and 0.11 – 0.18 mm (maximum permissible 0.25 mm).
3. If the gaps exceed the maximum values, replace the gears and, if necessary, the pump housing.
4. Using a feeler gauge and a ruler, check the gap between the ends of the gears and the plane of the housing, which should be equal to 0.066–0.161 mm (maximum permissible 0.2 mm). If the gap is more than 0.2 mm, replace the gears or the pump housing, depending on which is worn out.
5. After measuring the parts, determine the gap between the driven gear and its axis, which should be 0.017–0.057 mm (maximum permissible 0.1 mm), and also between the pump shaft and the hole in the housing, this gap should be 0.016–0.055 mm (maximum permissible 0.1 mm). If the gaps exceed the limits, replace the worn parts.
Checking the pressure reducing valve
6. When repairing the oil pump, check the pressure relief valve. Pay attention to the surfaces of the valve and pump, as possible contamination or deposits on the mating surfaces can lead to jamming. There should be no nicks or burrs on the mating surface of the valve, which can lead to a decrease in pressure in the system.
7. Check the elasticity of the pressure reducing valve spring by comparing the obtained data with those shown in Fig. Basic data for checking the pressure reducing valve spring.
Checking the shaft and gear of the oil pump drive
8. There should be no dents or scratches on the surfaces of the roller support journals and on the working surface of the eccentric.
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9. The teeth of the gears of the oil pump drive and the ignition distributor must not be chipped; if such a defect is found, replace the shaft and gear.
Checking the oil pump drive shaft bushings
10. Check the inner diameter of the bushings, their press fit in the sockets, and the alignment of the lubrication hole in the front bushing with the channel in the cylinder block (turning the sleeve). The inner surface must be smooth and free of burrs.
11. Having measured the diameters of the roller and bushings, determine the gaps between the bushings and the bearing surfaces of the roller. If the gap exceeds 0.15 mm (wear limit), and also if the surfaces of the bushings are damaged or their pressing is weakened, replace the bushings.
12. When replacing, use the A.60333/1/2 mandrel for both removal and installation (1 – A.60333/1/2 mandrel).
13. The bushings must be pressed into the sockets, with the oil hole in the front bushing facing the channel in the cylinder block.
14. After pressing, the bushings must be finally processed and adjusted to the internal diameter (dimensions are given in Fig. Main dimensions of the oil pump and its drive).
15. To ensure complete alignment of the shaft bushings, the A.90353 reamer is used to finish them, with which both bushings are processed simultaneously.
Checking the oil pump drive gear bushing
16. The inner surface must be smooth and free of burrs, otherwise replace the bushing.
17. To press out and press in the bushing, use the A.60326/R mandrel (1 – A.60326/R mandrel).
18. After pressing in, expand the bushing to a diameter of 16.016–16.037 mm.