940 L4-2320cc 2.3L DOHC VIN 89 B234F FI (1991)
Camshaft: Description and Operation
Twin Overhead Camshafts
The valves are operated by twin overhead camshafts through hydraulic tappets.
Since the valve guides are located at an angle of 19° to the vertical, a special tool is required when replacing the components.
The valve cover gasket is in two sections, one for sealing the spark plug wells and the other the joint between the cover and camshaft carrier.
The joint between the camshaft carrier and cylinder head is sealed in two ways. The spark plug wells are sealed by means of four 0-rings between the
carrier and the head, while Loctite sealing compound is used to seal the flat mating surfaces between the two components. The compound should be
applied using a shorthaired roller, taking particular care to ensure that it does not enter the lubricating oil channels. In the worst case, this might block the
supply of oil to the tappets and camshaft bearings.
