1. Remove the oil pan.
2. Loosen the two mounting bolts and pull the pump unit down together with the suction tube and suction cup.
3. Place the oil pump on the workshop table, lift the cover with a screwdriver and wash the suction screen in kerosene. Insert the screen back and press the cover.
4. Unscrew the two small bolts and remove the cover from the pump housing. Check the surface of the cover. As can be seen in the picture (photo 2.24), the gear transmission has left marks on the cover. If the depth of these marks is significant, the surface of the cover must be ground. The gap between the teeth, the gap between the front surface of the teeth and the housing, or finally the gap between the side surfaces of the gears and the pump cover, cause a leak through which oil flows from the pressure chamber into the pre-chamber. Some of the oil circulates through the pump instead of the oil line. As a result, the pump's performance decreases (or the amount of oil supplied to the lubrication system), and oil pressure. The second parameter is very important. At very low pressure, the oil film in the bearings may break, which will cause their accelerated wear.
Therefore, if there is any doubt about the correct operation of the pump, it is better and more economical to replace it with a new one. Re-extracting the pump is an expensive operation, but in the event of failure of the liners, the cost of repair will exceed the price of a new pump several times.
5. Remove the gear and wash the housing and gears in clean kerosene. Dry and assemble the gear, lubricating with clean motor oil. Measure the gap between the gears with a feeler gauge, the so-called gap between the teeth (photo 2.25). It should be from 0.05 to 0.20 mm.
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6. Place the guide bar on the pump body and measure the gap between the gears and the guide bar with a feeler gauge. This gap between the side surfaces of the gears and the pump cover should not exceed 0.15 mm.
7. Measure the gap between the tip of the gear tooth and the wall of the pump housing with a feeler gauge. This gap should not exceed 0.25 mm. Usually, if this gap is larger than the permissible value, this indicates wear of the bushings in which the pump drive shaft is located on bearings. If the gap in the bushings exceeds 0.20 mm, the pump housing must be equipped with bushings.
Usually, if something in the pump is worn out, especially the gears or the housing, the entire pump must be replaced. If the wear is within acceptable limits, the pump is assembled and installed on the engine.
Installation
8. Before fixing the pump, check that the working surfaces are clean. Then insert the pump into the hole and tighten the fastening bolts to the specified torque.
9. Install a new oil pan gasket, but do not use sealant (because it makes it difficult to separate from the body during the next repair). Secure the oil pan and tighten the fastening bolts evenly.
10. Screw in the oil drain plug together with a new O-ring.
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