CAMSHAFT (1) IN CAMSHAFT HOUSINGS (2)

Description 1036G

1.3 Multijet

CAMSHAFTS

Cast iron, with induction-hardened cams.

CAMSHAFTS

The exhaust-side camshaft is controlled directly by the chain and transmits power to the inlet-side camshaft by means of a pair of straight toothed gears.

The exhaust side camshaft also controls the high pressure pump, whilst the inlet side camshaft controls the vacuum unit.

TAPPETS

Each valve uses a hydraulic tappet operated by a rocker, in turn, moved by the camshaft.

The rocker arms are designed to prevent serious damage to the other engine components if the timing chain slips or breaks; in effect, as a result of pre-set fracture lines, the stresses caused through the contact of the valves with the pistons are absorbed.

1. Rocker arms

2. Hydraulic tappet

3. Clip

Timing drive chain layout

The layout of the timing drive chain is illustrated in the diagram below.

1. Camshaft driven gear

2. Timing drive chain

3. Chain guide fixed pad

4. Drive gear

5. Chain guid moving pad

6. Timing chain tensioner