Caution: When replacing the oil pump drive chain, the oil pump sprocket must also be replaced.
Attention! When removing the chain, it is necessary to use an emery wheel or vulcanite to cut off the protruding heads of one of the chain links.
Removal the oil pump drive chain
1 – fixing plate; 2 – chain link; 3 – oil pump sprocket mounting bolt; 4 – oil pump sprocket
1. Remove the oil pan.
2. Loosen the oil pump sprocket mounting bolt.
3. Using an emery wheel or vulcanite, grind down the rivets on one of the chain links.
4. Remove the chain link retaining plate and knock out the chain link (see picture).
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5. Unscrew the oil pump sprocket mounting bolt and remove the sprocket from the pump shaft.
6. Install the new sprocket onto the oil pump shaft with the convex side facing the pump.
7. Using the link removed from the chain, connect the end of the old chain to the new chain. Rotate the engine crankshaft clockwise and pass the new chain around the crankshaft sprocket. At the same time, constantly keep the chain taut so that it does not come off the crankshaft sprocket.
8. After the new chain comes out, disconnect the old chain from it.
9. Install the ends of the new chain onto the oil pump sprocket and connect them with a connecting link.
10. Install the locking plate on the connecting link of the chain and rivet the connecting link. Check that there are no metal burrs left after riveting the connecting link.
11. Tighten the oil pump sprocket mounting bolt to the specified torque.
12. Install the oil pan.