Fig. 91. Elements of the valve timing drive: 1 - intermediate shaft; 2 - leading ring; 3 - bolt, 10 Nm; 4 - sensor drive; 5 - bolt, 10 Nm; 6 - bolt, 25 Nm; 7 - elastic element of the tensioning device; 8 - double-row chain tensioner, 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 flange, 25 Nm; 18 - sedative; 19 - bolt, 20 Nm; 20 - crankshaft sprockets
The camshafts are not driven directly, but through the intermediate shaft gear 1 (Fig. 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, sprocket 13 on the front end of the crankshaft, which drives the single-row chain 14, is non-removable (removed together with the crankshaft).
The specified tension of the double-row chain, driving the camshafts, is carried out by a plate chain tensioner (tensioner) 8, which is adjusted using an externally inserted chain tension adjusting bolt. The single-row chain between crankshaft sprocket 13 and intermediate sprocket 11 also has a tensioner 12, which is adjusted hydraulically and does not require any additional intervention. It should be remembered that the chain tensioner has a locking device that must be unlocked before changing the chain tensioner. The double-row drive chain is pressed from the outside inward 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 out. Bolts and special pins are used to secure the dampers.
The original information is posted on the resource VWMANUAL.ru
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