Removal
1. Remove the drain plug from the oil pan and drain the engine oil into a clean container.
2. Remove the timing belt as described previously.
3. Loosen the pulley bolt and remove the pulley and sprocket from the crankshaft.
4. Loosen the mounting bolts and remove the oil pan together with the gasket (figure B:27).
5. Remove the two bolts securing the oil intake struts to the cylinder block and the two bolts securing the oil intake flange to the oil pump.
6. Loosen the oil pump mounting bolts and remove the pump from the front surface of the cylinder block. Remove the oil pump gasket.
7. To facilitate access before removing the oil pump, you can first remove the rear plate of the timing belt cover.
Inspection
The oil pump is supplied as a spare part only as a single unit, therefore a defective or worn out pump must be replaced as an assembly.
Since March 1977, a modified oil pump has been installed, featuring an enlarged, longer oil channel located on the surface mating with the cylinder block (figure B:28). When installing a new pump, it is necessary to install a new gasket that matches it (figure B:29), since the old type gasket with the new pump will not provide the necessary oil pressure. The new type gaskets can be used with both new and old type pumps. In addition, the new pump uses a new oil intake, the height of which is 115.0 mm, which is 11 mm shorter than the previous one (figure B:30). This type of oil intake is installed in the presence of a new type of oil pump and oil pan.
To remove the relief valve, which is installed in the lower part of the oil pump housing, unscrew the plug that holds it. Inspect the valve plunger for wear or damage, and check that the spring is not weakened. Replace defective parts if necessary.
Installation
1. Make sure that the mating surfaces of the oil pump, oil pan and engine block are clean of any old gasket residue.
2. Use new gaskets when installing the pump and oil pan.
3. Before installation, clean the oil intake mesh filter.
4. Before tightening the bolts, check that the lower edge of the pump body is aligned with the lower surface of the crankcase.
5. Tighten the oil pan mounting bolts evenly to avoid deformation of the pan.
6. Tightening torque of oil pump mounting bolts: 0.8 kg·m.
7. Lubricate the surface of the crankshaft pulley mating with the oil seal, then insert the pulley into the oil pump housing. Tighten the pulley mounting bolt to a torque of 8.0 kg·m.
8. Install the timing belt as described previously.
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9. Tighten the oil pan mounting bolts and fill the pan with the correct grade of oil in the required quantity (see section "Technical data").
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