Removal
1. Remove the oil pan (see paragraph 12).
2. Remove the three oil pump mounting bolts (figure 13.2). Disengage the pump sprocket from the chain and remove the oil pump. If the pump dowel pin is loose, remove it and store it in a safe place along with the bolts.
Figure 13.2. Remove the three oil pump mounting bolts
Inspection
3. Inspect the oil pump sprocket for signs of damage or wear, such as chipped or missing teeth. If the sprocket is worn, the pump assembly must be replaced as the sprocket is not supplied separately. In addition, it is recommended to simultaneously replace the chain and the drive sprocket located on the crankshaft. On 1.4L engines, replacing the chain and drive sprocket is a procedure that requires removal of the main bearing housing and therefore cannot be performed without removing the engine from the vehicle. On 1.6L engines, the oil pump drive sprocket and chain can be removed without removing the engine from the vehicle after removing the crankshaft timing pulley and crankshaft oil seal housing.
4. Loosen and remove the bolts securing the mesh filter cover to the pump body, and then remove the filter cover. Remove the piston and spring from the relief valve (and guide pin, 1.6L engines only), noting for yourself how they are installed.
5. Inspect the impellers and pump housing for signs of wear and scoring. If there is wear, the pump assembly should be replaced.
6. Inspect the relief valve piston for signs of wear or damage and replace it if necessary. The condition of the safety valve spring can only be assessed by comparing it with a new one. If there is any doubt about the condition, it should also be replaced. The piston and spring are supplied separately.
7. Thoroughly clean the oil pump strainer with a suitable solvent and inspect it for any signs of blockage or damage. If the filter is damaged, the mesh filter assembly with the cover should be replaced.
8. Install the spring, piston and (if available) guide pin of the relief valve into the mesh filter cover, then install the cover onto the pump body. Align the relief valve piston with the corresponding mounting hole in the pump. Replace the cover mounting bolts and tighten them securely.
Installation
9. Ensure the dowel pin is in place, then engage the pump sprocket with the appropriate drive chain. Install the pump using the pin as a guide. Install the pump mounting bolts and tighten them to the specified torque.
10. Install the oil pan as described in paragraph 12.