On engines «1Z» and «AFN» The tension of the toothed belt is adjusted automatically by a spring-loaded tension roller. During operation, only adjustment of the initial position of the roller is required.
In the cylinder block there is an intermediate shaft with a toothed pulley mounted on a key, driven by a toothed camshaft drive belt and used to drive the oil and vacuum pumps. The details of the gas distribution mechanism are shown in fig. 3-9. Valve timing is shown in Table 3-4. The device of hydraulic pushers and the scheme of their work are similar to the description in the corresponding section «Petrol 8-valve engines».
Pic. 3-9. Details of the gas distribution mechanism:
1 - camshaft;
2 - hydraulic pusher;
3 - cracker;
4 - a plate of springs;
5 - valve springs;
6 - oil cap;
7 - spring washer;
8 - exhaust valve;
9 - inlet valve;
10 - key;
11 - a gear pulley of a camshaft;
12 - toothed pulley of the crankshaft;
13 - toothed belt;
14 - tension roller;
15 — a back protective cover of a gear belt;
16, 17 - upper and lower front protective covers of the toothed belt.
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