Adjusting the camshaft chain tension (VAZ-21011)

1. Loosen cap nut 1 (see Fig. Section of chain tensioner) tensioner. In this case, rod 3 is released and the chain is tensioned by shoe 7 (see Fig. Scheme of the camshaft drive mechanism and auxiliary organs), which is acted upon by spring 8 (see Fig. Section of chain tensioner).

2. Turn the crankshaft 1–1.5 turns in the direction of rotation and stop it in such a position that the mark on the camshaft bearing housing is opposite the mark on the camshaft sprocket (see Fig. Checking the alignment of the timing mark on the camshaft sprocket with the mark on the bearing housing). In this case, the tensioner spring acting on the shoe will automatically adjust the chain tension.

3. Tighten nut 1 of the tensioner, due to which rod 3 is clamped by the collets of cracker 9, and when the engine is running, only spring 5 acts on plunger 7. This spring presses the plunger away from the head of rod 3, and oil flows into the gap between them when the engine is running, acting as a shock absorber when the chain hits.

4. Due to the guaranteed gap of 0.2–0.5 mm between rod 3 and plunger 7, spring 8 comes into action when the chain hits hard.

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