Withdrawal
1. Remove the toothed drive belt and crankshaft sprocket as described in Chapter 6.
2. Remove the pallet as described in Chapter 15.
3. Unscrew the bolts and remove the crankcase ventilation channel from the base of the block (see illustrations).
4. Using special pliers, remove the oil strainer retaining ring on the base of the oil pump pickup tube (see illustrations).
5. Using a screwdriver or similar tool, pry up the tabs on the lock plate. Remove the bolts securing the oil pump pickup tube bracket to the crankcase, then remove the bolts on the oil pump base and remove the lock plate. Remove the tube and remove the gasket or O-ring (see illustrations).
6. Turn off mounting bolts and take the oil pump from a forward part of the block of cylinders. Remove the gasket. Note that some of the oil pump mounting bolts also attach the inner timing belt cover (see illustrations).
Inspection
7. Loosen the cone head screws securing the pump cover and remove the cover.
8. Check that there is a mark on the exposed surface of the pump rotors. If this is not the case, make a mark to properly orient the rotors during installation.
9. Remove the relief valve plug, O-ring, spring and plunger (see illustrations).
10. Thoroughly clean all components and inspect pump housing and cover for scratches and signs of wear. Inspect the bypass valve plunger and its guide wall for damage and signs of wear, and ensure that the spring is not damaged or deformed. Check the rotors for damage and wear. New rotors are not commercially available, so if they are excessively worn, the oil pump must be replaced.
11. Using a screwdriver, carefully pry the stuffing box away from the front of the pump. If this fails, use a drift by inserting it from the inside of the pump. Lubricate the sealing lip of the new stuffing box with oil, insert the stuffing box closed face out and use a block of wood to press it into the pump until the stuffing box is flush with the edge of the hole. If there are scratches on the crankshaft oil seal contact surface, move the oil seal a little deeper so that its sealing lip rests on the undamaged part of the crankshaft (see illustration).
12. Reassemble the pump by installing the rotors and cover. The inner rotor should be facing the crankshaft with the splined side, and while theoretically the outer rotor can be installed either way, it should also be oriented the way it was before removal. Some rotors have a triangular design and this mark must face the pump cover. Before installing the cover, fill the gaps between the rotors with oil to ensure an immediate supply of oil to the engine after it starts.
13. Tighten the cover screws securely.
14. Assemble the bypass valve and tighten the plug securely (see illustration).
Installation
15. Install a new gasket on the cylinder block front wall pins and secure it in place with a little grease.
16. Install the oil pump on the engine block, making sure the groove on the inner rotor fits into the clip on the crankshaft. Be careful not to damage the oil seal on the end of the crankshaft.
17. Insert the bolts and tighten them in a diagonal sequence with the tightening torque specified in the Specifications.
18. Install the oil pickup tube with a new gasket or O-ring and tighten the bolts. Bend the locking tabs over the bolts to lock them.
19. Install the strainer oil receiver and attach it with the retaining ring.
20. On 1T engines, install the crankcase ventilation channel and tighten the bolts with the torque specified in the Specifications.
21. Install pan, timing belt and sprocket (see chapters 15 And 6).
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