Pic. 116. Location of the oil pump on the 2.0 l engine
Removing and installing the oil pump
As on the 1.6 liter engine, to remove the oil pump the oil pan and oil intake screen must be removed. A conventional centrifugal pump is located under a cover screwed to the outside of the pump housing. Before the cover collapses, remove the pump gear.
- Drain the engine oil and remove the oil pan.
- Unscrew 2 bolts and 2 nuts, remove the oil reflector screen and the oil receiver screen from the bottom side of the crankcase. Figure 111 shows the location of the oil receiver grid.
- Remove the toothed belt drive in accordance with the instructions in chapter 2.8 for the 2.0 l engine.
- Unscrew the pump drive gear nut (while holding the gear) and remove the gear from the shaft.
- Remove the 12 bolts from the front of the engine and remove the pump assembly along with the gasket. If the pump is firmly seated, you can carefully tap the pump housing from the inside of the crankcase with a plastic hammer. Install the pump in the reverse order. Tighten the bolts evenly to a torque of 9 Nm. Install the timing belt as described when installing the cylinder head for this engine. Finally, install the oil pan (chapter 3.1) and fill the engine with the prescribed amount of oil.
Oil pump overhaul
Figure 117 shows the pump parts.
Pic. 117. Oil pump disassembled for a 2.0 liter engine. 1. Oil pump cover; 2. O-ring seal; 3. Driven rotor; 4. Oil pump housing; 5. Oil seal; 6. Drive rotor; 7. Pressure reducing valve; 8. Spring; 9. Spring stop; 10. Retaining ring
- Unscrew the two bolts from the front side of the pump, remove the cover and remove the O-ring from the groove.
- Pull out both rotors. Rotors can only be replaced as a set. Mark the outside of the rotor with a felt-tip pen. Clean and check all parts. Replace defective parts immediately. To check the rotors, the following checks should be carried out:
- Insert both rotors into the housing, as shown in Figure 115, and using a feeler gauge, measure the gap between the outer side of the outer rotor and the pump hole. If the size exceeds the maximum value of 0.20 mm, replace the rotor set or oil pump. During the next check, use a feeler gauge to measure the gap between the tip of the outer rotor and the tip of the inner rotor (middle part of picture 115), There is a gap in this place । should not exceed 0.20 mm. Otherwise, replace the rotors as a set or the pump. Place a ruler on the surfaces of the rotors and housing (right side of figure 115) and measure the gap between the rotors with a feeler gauge. The gap should not exceed 0.10 mm. When removing the pump, be sure to replace the oil seal in the pump housing. Check the pressure relief valve piston bore for wear and scoring. Reassembling the oil pump is carried out in the reverse order, performing the following points:
- Install a new O-ring into the pump housing. The sealing ring is pressed to a protrusion of 1.0 mm with the outer surface of the ring above the surface of the housing.
- Place the new O-ring into the groove in the housing and insert both rotors into the housing in accordance with Figure 118. When installing the old rotors, pay attention to the markings on the outer rotor. Pour some oil from an oil can into the rotors.
Pic. 118. Oil pump assembly on a 2.0 l engine 1. Drive rotor; 2. Driven rotor; 3. O-ring
- Lubricate the seal lips and carefully place the cover on the pump body without damaging the seal. Tighten both cover bolts to the tightening torque (10 Nm).
- Install the pressure reducing valve parts in accordance with Figure 119 and secure them with a retaining ring.
Pic. 119. The pressure reducing valve is inserted into the lower part of the pump housing1. Pressure reducing valve; 2. Spring; 3. Retaining ring