If necessary, check the removed pump:
- First mark the surfaces of the driven driver and then remove it from the housing.
- Clamp the drive gear in a vice with soft metal spacers and unscrew the nut with a spanner. Remove the pump gear and pull out the driver.
- Unscrew the plug from the bottom and remove the pressure reducing valve parts. Clean all parts thoroughly and replace if necessary. The oil seal in the housing must be replaced (carefully pull out with a screwdriver). Check that there are no potholes on the tops of the leash. The leashes must be replaced as a set.
- Insert the outer driver into the hole and use a feeler gauge to measure the gap between the outer side of the outer driver and the pump hole. The gap should not exceed 0.2 mm. For the next check, insert a feeler gauge between the top of the outer drive tooth and the top of the inner drive tooth (see fig. 318). The gap should not exceed 0.20 mm. Otherwise, replace the oil pump and/or leads (included). Place a ruler on the surface of the body (Pic. 319) and measure the gap between the ruler and the leads with a feeler gauge. The gap should not exceed 0.20 mm. Otherwise, replace the oil pump and/or leads (included). Reassembling the oil pump is done in the reverse order. Insert the outer leash with the marked surface facing out. Insert the inner driver and slide the pump drive gear onto the driver shaft. Screw on the nut and again clamp the drive gear in a vice. Tighten the nut to a torque of 47 Nm. Pour oil into the pump hole to pre-lubricate the drives. Insert the pressure reducing valve parts and tighten the plug. Lubricate the sealing lips of the oil seal and drive the oil seal flush into the pump housing.
Pic. 318. Measuring the gaps between the tops of the teeth of the drivers
Pic. 319. Measuring the axial play of the pump leads
Replacing the oil filter is done in the same way as on gasoline engines.