Timing mechanism drive
- 1 - camshaft sprocket;
- 2 - pulse rotor for the Hall sensor;
- 3 - camshaft sprocket bolt, 10 Nm. Before screwing in the bolt, lubricate the underside of the bolt head with a thin layer of engine oil. When tightening the bolt, keep the camshaft from turning with a 24 wrench;
- 4 - pivot pin, 18 Nm;
- 5 - sealing ring. If damaged, use a new O-ring;
- 6 - chain tensioner, 40 Nm;
- 7 - shoe;
- 8 - asterisk;
- 9 - two-row roller chain. Before removing the chain, note the direction of rotation of the chain;
- 10 - bolt, 100 Nm;
- 11 - asterisk;
- 12 - bolt, 10 Nm;
- 13 - chain tensioner. Before removing the chain tensioner, use a screwdriver to release the locking gear and separate the chain guide from the tensioner. The engine may only be cranked with the chain tensioner installed;
- 14 - chain drive sprocket,
- 15 - single chain;
- 16 - chain guide;
- 17 - special pin for chain guide, 10 Nm;
- 18 - guide pin with shoulder, 10 Nm;
- 19 - bolt, which is installed using a special tool VW-D6, 20 Nm,
- 20 - bolt, 20 Nm;
- 21 - chain guide;
- 22 - bolt installed using a special tool VW6, 20 Nm;
- 23 - guide ring;
- 24 - intermediate shaft
Marking locations before removing timing chains
The location of the groove on the intermediate shaft sprocket when installing the piston of the first cylinder at TDC on the compression stroke
The location of the elements of the gas distribution mechanism when the piston of the first cylinder is installed at top dead center in the compression stroke
- 1 - chain:
- 2 - chain guide;
- 3 - front sprocket of the intermediate shaft;
- 4 - rear sprocket of the intermediate shaft;
- And - a clamp of the mechanism of a tension of a chain;
- B - the adjusting tooth on the crankshaft sprocket must be in line with the No. 1 main bearing cap connector;
- C - alignment mark on the intermediate shaft sprocket;
- D - alignment mark on the intermediate shaft sprocket
The camshafts are driven from the crankshaft, not directly, but through an intermediate sprocket. An asterisk of smaller diameter is fixed on one shaft with an intermediate sprocket, through which the second chain is also actuated by the gas distribution mechanism. The upper camshaft drive chain is tensioned by a plate tensioner, which is held in position by an external adjusting bolt. The lower timing chain has a hydraulic tensioner that does not require adjustment.
Order of execution
1. Before removing the timing chains, use paint to mark the chains at the locations shown in fig. Places for applying marks before removing the timing chains.
2. Turn the crankshaft of the engine to such a position that the piston of the first cylinder is at top dead center. In this case, the alignment mark on the pulley / vibration damper of the crankshaft must be aligned with the pointer on the chain cover.
3. When installing the piston of the first cylinder at TDC, a groove should be visible on the sprockets of the intermediate shaft (see fig. The location of the groove on the intermediate shaft sprocket when installing the piston of the first cylinder at TDC on the compression stroke).
If the slot on the countershaft sprocket is not visible, rotate the engine one full revolution and re-align the timing marks with the indexes.
4. Fix the camshafts by inserting the special tool VW-3268 into the grooves of the camshafts.
5. When unscrewing the camshaft sprocket bolt, use a wrench to hold the camshaft from turning by the flats.
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