Pic. 91. Elements of the timing mechanism drive: 1 - intermediate shaft; 2 - driving ring; 3 - bolt, 10 Nm; 4 - sensor drive; 5 - bolt, 10 Nm; 6 - bolt, 25 Nm; 7 - elastic element of the tension device; 8 - tensioner of a double-row chain, 20 Nm; 9 - double row chain; 10 - double-row chain drive sprocket; 11 - single-row chain drive sprocket; 12 - chain tensioner with shoe; 13 - chain drive sprocket built into the crankshaft; 14 - single-row chain; 15 - damper bar; 16 - special bolt, 25 Nm; 17 - pin with shoulder, 25 Nm; 18 - calmer; 19 - bolt, 20 Nm; 20 - crankshaft sprockets
The camshafts are not driven directly, but through the intermediate shaft gear 1 (pic. 91).
In addition, a small sprocket 10 is located on the intermediate shaft, which drives the double-row chain 9 of the camshaft drive. On the VR6 engine, the sprocket 13 at the front end of the crankshaft, which drives the single row chain 14, is non-removable (removed with crankshaft).
The set tension of the double-row chain, the camshaft drive, is carried out by the lamellar chain tensioner (tensioner) 8, which is adjusted by means of an externally inserted chain tension adjusting bolt. The single row chain between the crankshaft sprocket 13 and the intermediate sprocket 11 also has a tensioner 12 which is hydraulically adjustable and does not require any additional intervention. Note that the chain tensioner has a locking device that must be released before the chain tensioner can be changed. The two-row drive chain is pressed from the outside to the inside by the damper 18, which prevents the drive chain from hitting the camshafts. The single-row chain is also pressed by the damper 12, but the chain is pressed from the inside to the outside. Bolts and special fingers are used to fasten the dampers.
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