Fig. 2-140. Timing mechanism parts:
1 - exhaust camshaft;
2 - intake camshaft;
3 - hydraulic pusher;
4 - crackers;
5 — valve spring plate;
6 - valve springs;
7 - oil deflector cap;
8 — valve spring support washer;
9 - exhaust valve;
10 — inlet valve;
11 — intake camshaft drive chain;
12 — toothed pulley of the exhaust camshaft;
13 — key;
14-toothed camshaft drive belt;
15 - tension roller;
16 - rear toothed belt cover;
17 - Upper front timing belt cover;
18 - Lower front timing belt cover.
The toothed pulleys of the camshaft and crankshaft are secured with segment keys.
The cylinder block contains an intermediate shaft with a toothed pulley, which drives the oil pump and the ignition distributor. The intermediate shaft is driven by a toothed belt of the exhaust camshaft drive.
The information is available on the website: www.VWMANUAL.ru
The valve timing phases with a calculated zero clearance in the valve drive mechanism and a valve lift height of 1 mm are presented in Table 2-23.
The engine uses two separate mechanisms for driving the intake and exhaust valves with intake and exhaust camshafts. The maximum axial movement of the camshafts is 0.15 mm. The gap between the shaft journals and the bearing holes is no more than 0.1 mm.
The maximum permissible ovality of the shaft journals is no more than 0.01 mm.
The intake camshaft has alphanumeric markings applied between the intake cams of the 3rd and 4th cylinders:
- engine "KR": 027 101 K or L;
- engine "9A": 027 101 M or N.
The camshafts of the "ABF" engine have the following markings applied between the cams of the 1st and 2nd cylinders:
- intake shaft: 051 102;
- exhaust shaft: 051 101 or 051 101 A.
The intermediate shaft is driven by a toothed belt of the exhaust camshaft drive. The intermediate shaft drives the oil pump and the ignition distributor. The axial clearance of the intermediate shaft is no more than 0.25 mm.
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