Technical characteristics of the valve timing mechanism (VW Passat B2)

Contents: Camshaft ↓ Valve timing* ↓ Toothed belt ↓

The engine uses a valve timing mechanism with an overhead camshaft, the drive of which is carried out by a toothed belt from a toothed pulley of the crankshaft. The belt tension is adjusted mechanically by turning the water pump housing.

The toothed pulleys of the crankshaft and camshaft are mounted on segment keys.

Camshaft

The camshaft is three-bearing. In the rear end of the shaft there is a hole for the ignition distributor sensor drive. Between the cams of the 2nd and 3rd cylinders on the shaft there are two projections.

Shaft marking: FZ.

Camshaft journal diameter, mm:

front: 31.45;
average: 39.45;
back: 40,45.

Radial runout of the middle journal of the shaft, no more than, mm: 0.01.

Valve timing*

Start of opening of the intake valve before TDC of the exhaust stroke with an advance of: 3°.
Closing of the intake valve after BDC of the compression stroke with a delay of 46°.
Start of opening of the exhaust valve before BDC of the working stroke with advance: 47°.
Closing of the exhaust valve after TDC of the exhaust stroke with a delay of 7°.

*With a calculated zero clearance between the camshaft cams and levers, and a valve lift of 1 mm.

When the valve timing is set correctly, the mark on the crankshaft pulley should be aligned with the pointer on the cylinder block, and the mark on the camshaft toothed pulley should be aligned with the installation plate on the cylinder head.