BMW R 1200 CL Wartungshandbuch PDF herunterladen (Seite 7)

5

The two piece light alloy crankcase is man-

ufactured using a pressure die-casting

method.The oil pan, which holds 3.75 litres,

is integrated into the engine case halves.

As with all R Series bikes, the engine and

gearbox is a combined load bearing ele-

ment of the chassis. For this reason, both

case halves were designed with a specific

rigidity with the aid of computer calculations

of the Finite Element Method.

The 1-piece forged crankshaft is accommo-

dated centrally in the crankcase on sliding

bearings. It runs on two bearings, the rear

bearing being larger and designed as a

double collar bearing. The 125 mm long

connecting rods are made of sintered steel

and are cracked at the big end.

The weight-optimized box pistons are made

of light alloy and have machined valve

notches on the piston crown. A pressure

release channel above the piston ring zone

prevents a partial vacuum from building up

in the combustion chamber during engine

cool down to prevent oil from being pulled

in under vacuum when the engine is off.

The camshafts are mounted into the cylin-

der heads by separate camshaft carriers.

The cams are made up of a case-hardened

shaft with pressed-on individual cams

made of sintered material.

The camshafts are roller chain driven at a

2:1 ratio geared down by the auxiliary shaft,

which is located below the crankshaft and

also drives both duo-centric oil pumps.

The valves all have 5 mm valve stems.They

are actuated in pairs by clear chill cast tap-

pets, short aluminum tappet push rods and

forged valve lifters.

R 1200 CL

Engine

Technical Features in Detail

Engine Components

Crankshaft / Pistons

Cylinder head / Valve train

1 2 3 4 5 6 7 8 9 10 11 12 ... 107 108

R 1200 CL 1
R 1200 CL Introduction 83

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