Checking the technical condition and repairing the oil pump (VAZ-2105)

Wash all parts of the disassembled pump thoroughly in kerosene or gasoline and blow with compressed air. If there are cracks in the pump body or cover, replace them with new ones. Use a set of feeler gauges to check the gaps between the gear teeth, as well as between the outer and inner diameters of the gears and the walls of the pump body, which should be 0.15 mm and 0.11-0.18 mm, respectively. The maximum permissible gaps are 0.25 mm. If the gaps exceed the maximum permissible values, replace the gears and, if necessary, the oil pump body.

Using a ruler and feeler gauge, check the gap between the ends of the gears and the plane of the housing, which should be 0.06–0.16 mm (maximum permissible 0.20 mm). If the gap is more than 0.20 mm, replace the pump gears.

Measure the diameters and determine the gap between the axle and the driven gear, which should be 0.017-0.057 mm (maximum permissible 0.1 mm), and also between the pump shaft and the hole in the housing, which should be 0.016-0.055 mm (maximum permissible 0.1 mm). If necessary, replace worn parts with new ones. Permissible wear: driven gear axles up to a diameter of 11.90 mm, holes for the driven gear axle up to a diameter of 11.98 mm, holes in the housing for the pump shaft up to a diameter of 12.05 mm.

The surface of the pressure reducing valve and cover must be free of dirt and deposits, nicks and burrs that could lead to the valve jamming.

Check the length and elasticity of the pressure reducing valve spring. The length of the spring in a free state should be 38 mm, and under a load of 6.35±0.2 kgf - 20 mm. If the length or elasticity decreases, replace the valve spring with a new one.

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