The aluminum cover in the plane of contact of the gears should not have ledges. The surface should be flat. In case of noticeable wear, the cover is clamped at points G (figure 47) and mill surfaces B and V to size (13.5±0.3) mm. Maximum metal removal should not exceed 0.2 mm. Replace crankshaft oil seal 1 with a new one. When pressing in the oil seal, apply force as close as possible to the outer diameter of the oil seal.
Figure 47. Fastening points and milling planes of the oil pump cover
The working surfaces of the housing must not have scratches. The maximum outer diameter under the driven gear must not exceed 0 75.10 mm (figure 48). The maximum minimum segment width must be at least 3.40 mm. In case of significant wear, the pump body is replaced with a new one.
Figure 48. Limit wear of the oil pump housing
The maximum axial clearances are measured with an indicator; they should not exceed 0.12 mm for the drive gear; for slave 0.15 mm.
The maximum minimum dimensions of the gears are shown in Figure 49. If the clearances and dimensions exceed the maximum values, the gears are replaced with new ones.
Figure 49. Limit wear of oil pump gears
They also check whether the elasticity of the pressure reducing valve spring has decreased by comparing the obtained data with the required data:
- Length of spring in free state, mm — 46.5
- Length of spring under load (5.284±0.306) kgf, mm — 31.7
The maximum diameters must be: valves - not less than 11.98 mm; valve holes - no more than 12.03 mm.