Valve timing
Camshaft
The camshaft is seven-bearing.
The gap between the necks of the camshaft and the holes of the supports, mm: 0.059-0.1.
Camshaft axial clearance, mm: 0.2.
Timing belt for camshaft drive
Brands and type: Pirelli 111 R 254 or Gates 6017.
Number of teeth: 111.
Belt width, mm: 25.4.
The belt is tensioned by a mechanical tensioner from FAG, INA or SKF.
End runout of the belt on the side guide at a diameter of 52 mm, mm: 0.3.
Belt radial runout, mm: 0.2.
Number of teeth:
- camshaft pulley (catalog N 12 64 532): 42;
- intermediate shaft pulley (catalog N 1 265 458): 28;
- crankshaft pulley (catalog N 1264 5313): 21.
Intermediate shaft
The drive of the two-bearing intermediate shaft is carried out from the crankshaft by a toothed belt. A 12-tooth gear for driving the oil pump and ignition distributor is installed on the rear end of the intermediate shaft. On carburetor engines, the intermediate shaft drives the fuel pump through the cam.
Diameter of support necks, mm:
- on «320»: 38,0 -0,009 -0,025;
- on «323i»: 36,5 -0,009 -0,025;
Outer diameter of the oil pump drive gear and ignition distributor, mm: 18.0+0.048+0.035;
Diameter of the hole for the oil pump drive gear and ignition distributor, mm: 18-0.005-0.023;