BMW M5 Wartungshandbuch PDF herunterladen (Seite 18)

Cylinder head

The one-piece design of the cylinder head

offers advantages with regard to rigidity and a

reduction in sealing surfaces.

Both the idle air port as well as the secondary

air channel are integrated in the cylinder head.

Timing gear

A timing chain with separate chain tensioner

drives each intake camshaft (primary timing

gear). A toothed drive belt provides the drive

from the intake camshaft to the exhaust

camshaft (secondary timing gear).

For weight and friction reasons, the shape of

the hydraulic tappets in the S85 is based on

the box-type tappet as known from motor

racing engines. Since the tappets must not

rotate in the cylinder head, anti-torsion

needles which run in grooves milled into the

cylinder head are fitted in the tappets.

6 - Cross section of cylinder head (red = cut edge, orange = secondary air

channel, blue = water area, aqua = idle air port)

7 - Timing gear S85

8 - Valve train

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BMW M5 Wartungshandbuch Seite 18