Pic. 2.15. Timing mechanism drive chain: 1 - chain guide shoe; 2 - chain tensioner; 3 - chain damper; 4 - oil spray nozzle
A roller chain with a pitch of 8 mm is used. The timing chain is lubricated by an oil spray nozzle.
Chain tensioner
Pic. 2.16. Chain tensioner: 1 - cam spring; 2 - cam; 3 - plunger; 4 - spring
The chain tensioner uses a spring and oil pressure to maintain proper chain tension at all times. The chain tensioner reduces the noise produced by the chain. A ratchet mechanism is also used. To improve operational reliability, the chain tensioner is designed to be removed and installed outside the timing chain cover.