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). If the gaps exceed the maximum values, then the gears are replaced, and if necessary, the pump body.
Using feeler gauge 2, check the gap between the ends of the gears and ruler 1 (Fig. 27), which should be 0.066–0.161 mm (maximum permissible 0.20 mm). If the gap is more than 0.20 mm, replace the gears or the housing, depending on what is worn out.
Measure the diameters and determine the gap between the axle and the driven gear, which should be 0.017-0.057 mm (maximum permissible 0.10 mm), and also between the pump shaft and the hole in the housing, which should be 0.016-0.055 mm (maximum permissible 0.10 mm). If necessary, replace worn parts.
When repairing the pump, pay attention to the surfaces of the pressure reducing valve and the housing, which should not have any dirt, deposits, nicks, burrs that can lead to jamming of the valve or reduce the oil pressure in the system. Check the elasticity and length of the pressure reducing valve spring and compare with the data given above.
Check the ovality of the roller bushings 10 (see fig. 24) of the oil pump and ignition distributor drives, their pressing into the sockets, and also the coincidence of the hole in the front bushing with the channel in the cylinder block, i.e. whether the bushing has turned. Having measured the diameters of the shaft and bushings, the gaps are determined. If the gaps exceed 0.15 mm (wear limit), and also have damage to the surfaces or weakening of the pressing, the bushings are replaced. To replace the bushings, use the mandrel A.60333/1/2 (Fig. 28). After pressing, the bushings must be finally processed with the step reamer A.90353 to the dimensions specified in Table 2. The reamer processes both bushings at once to maintain their alignment.
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The pressing must not be loosened or the bushing of the oil pump and distributor drive gear must not be out of round. The inner surface must be smooth and free of burrs. Otherwise, the bushing must be replaced with a new one. The A.60326R mandrel (Fig. 29) is used for pressing in and out. After pressing in, the bushing is expanded to a diameter of 16.016–16.037 mm.
