Examination
1. Remove the top drive chain cover.
2. Remove the cylinder head cover.
3. For the crankshaft pulley bolt, turn the engine crankshaft and check the condition of the chain along the entire length. If the chain makes excessive noise when the engine is running, or if there is large chain end play on the sprocket, the chain must be replaced. If there is wear on the chain rollers, the chain must also be replaced.
Replacement
Attention! When removing the chain, use an emery wheel or vulcanite to cut off the protruding hats of one of the chain links.
Grinding the rivets of one of the chain links (A) and removal of the link from the drive chain (IN)
1. Remove the ground wire from the battery.
2. Unscrew the spark plugs.
3. Unscrew the drive chain tensioner.
4. Remove the top drive chain cover.
5. Remove the upper chain guide.
6. Remove the cylinder head cover.
7. Close the cylinder head and the space under the camshaft sprockets with a clean rag.
8. Using an emery wheel or vulcanite, grind off the rivets of one of the chain links on the side of the exhaust camshaft sprocket (see picture).
9. Remove the retainer plate and chain link from the drive chain.
10. Be careful to remove the rag so that metal chips do not get into the drive chain cover.
11. Using a chain link, connect the ends of the old and new chain.
12. Keeping the drive chain constantly taut, turn the engine crankshaft clockwise. In this case, the new chain, following the old one, will pass around the sprockets and guides.
13. After the end of the new chain appears, disconnect the old chain from the new one.
14. Install a new chain on the exhaust camshaft sprocket, then connect the two ends of the chain.
15. Install the fixing plate and rivet the connecting link of the chain.
16. Install the upper chain guide.
17. Install the upper drive chain cover.
18. Install the drive chain tensioner.
19. Turn the engine crankshaft clockwise and set the piston of the first cylinder to top dead center and check that all the alignment marks are aligned with the pointers.
20. Install the cylinder head cover.
21. Screw in the spark plugs.
22. Connect ground wire to battery.