Timing gear covers are cast from aluminum alloy.
Note. Since November 1978, the camshaft has been driven by a single chain.
Number of teeth:
- camshaft pulley: 26;
- crankshaft pulley: 13.
Number of chain links: 94.
Double chain dimensions: 3/8" x 7/32".
Chain roller diameter, mm: 6.35.
Valve timing (with a calculated gap between the toe of the rocker arm and the back of the cam).
The beginning of the opening of the intake valve to the TDC of the exhaust stroke with the lead: 4°.
Closing of the inlet valve after the BDC of the compression stroke with a delay: 52°.
The beginning of the opening of the exhaust valve to the BDC of the working stroke ahead of: 52°.
Closing of the exhaust valve after the TDC of the exhaust stroke with a delay: 4.
Camshaft
The camshaft is tricycle.
Gap between mounting flange and camshaft, mm: 0.02-0.13.
The gap between the necks of the camshaft and the holes of the supports, mm: 0.034-0.075.
Runout of the ignition distributor sensor drive gear, mm, no more than: 0.025.
Camshaft cam lift, mm: 7.0267±0.080.
In car models «316» (pre-1980 model year), «318», «320» n «320i» the same camshaft is used.
In car models «315», «316» (from model year 1981) And «318)» a redesigned camshaft is used.
Camshaft Drive Chain Tensioner
Tensioner plunger length, mm: 61.8-62.0.
The length of the spring in the free state, mm: 155.5.
Wire diameter, mm: 1±0.015.