Contents: Oil pump ↡ Drive chain - replacement ↡
Oil pump
Removal
1. Remove the pan as described in paragraph 11.
2. Loosen the pump sprocket mounting bolt and remove the washer. Remove the oil pump sprocket together with the drive chain from the oil pump shaft.
3. Unscrew the bolts securing the oil pickup pipe to the cylinder block and remove the washers.
4. Unscrew the three bolts securing the oil pump to the cylinder block and remove the washers (see fig. 12.4).
Fig. 12.4. Oil pump mounting parts
1 Oil pump mounting bolts
2 Bolt for fastening the oil pickup pipe to the support bracket
5. Remove the pump from the cylinder block, taking into account that it is located on two keys.
Examination
6. Except for the bypass valve, the oil pump is a non-disassemblable unit. To remove the valve, follow these steps:.
7. Unscrew the bypass valve plug. Be careful, as the plug is pressed by a spring and will be pushed out when it reaches the end of the thread (see fig. 12.7).
Fig. 12.7. Oil pump bypass valve parts
1 Cork
2 Spring
3 Guide rod
4 Piston
8. Remove the spring, guide rod and piston.
9. Thoroughly clean all parts and inspect their condition. If significant wear or damage is found, replace the part(s) - pay particular attention to the spring.
10. Install the parts in the reverse order. Tighten the plug to the required torque.
Installation
11. Installation is carried out in reverse order, taking into account the following points:
- a) Dip the oil pump into clean engine oil.
- b) Check that the pump is mounted on the keys.
- c) Tighten the pump mounting bolts to the required torque.
- d) Install the pump sprocket with the convex side facing the pump.
- d) Tighten the pump sprocket mounting bolt to the required torque.
- e) Install the tray as described in paragraph 11.
Drive chain - replacement
Note: Removing the chain using this method requires using a portable electric grinder to cut one of the chain links. Before you begin, make sure you have access to this tool and a new chain and connecting link. The oil pump sprocket should be replaced with the chain.
12. Remove the oil pan as described in paragraph 11.
13. Loosen the oil pump sprocket mounting bolt.
14. Using a grinder, file down the chain link protrusion on the top of the sprocket - be careful not to damage the sprocket.
15. Remove the chain link plate and push the link to the back of the chain (see fig. 12.15).
Fig. 12.15. Replacing the oil pump drive chain
1 Chain link plate
3 Oil pump sprocket bolt
2 Chain link
4 Oil pump sprocket
16. Loosen the oil pump sprocket mounting bolt and remove the washer, then the sprocket from the pump shaft.
17. Install the new sprocket onto the pump shaft with the concave side facing the pump.
18. Using a new link, connect one end of the new chain to the end of the old chain so that when you turn the crankshaft clockwise, the new chain will go down around the sprockets, then up the other side. Fit the link to the back of the sprocket and make sure the link is securely in place - do not fit the link plate to secure the link at this stage.
19. After this, it is necessary to pass the new chain through the sprockets and guides. During this procedure, the following points should be observed:
- a) Maintain chain tension to prevent chain links from jumping off the camshaft sprocket.
- b) Pull the old chain upwards to prevent it from slipping off the crankshaft sprocket or becoming skewed and jamming in the housing.
Tip: Temporarily secure the ends of the new chain to the camshaft sprocket using string or wire threaded through the holes in the sprocket and around the chain.
20. Using a suitable socket wrench, slowly turn the crankshaft pulley hub bolt clockwise, following the recommendations given in the previous step.
21. When the end of the new chain appears, remove the link (checking that the tension of the new chain has not decreased and that the chain links remain aligned with the sprockets) and disconnect the new chain from the old one. Remove the old chain.
22. Place the new chain on the camshaft sprocket, then connect the two ends of the chain with the connecting link inserted into the back of the sprocket.
23. Install the link plate and secure the link by flattening the link pins. A special device is provided for this purpose, however, satisfactory results can be achieved using a hammer and a block of metal (or the second hammer), to support the back of the chain. Be careful not to damage the chain or sprocket.
24. Check that the link is securely fastened without any metal burrs or chips.
25. Tighten the oil pump sprocket bolt to the specified torque,
26. Install the tray as described in paragraph 11.