Camshaft Transmission

Fig 1: Identifying Camshaft Transmission

Courtesy of VOLVO CARS CORPORATION

Number	Designation	Number	Designation
1	Camshaft chain	3	Intermediate shaft
2	Auxiliary unit sprocket

Both camshafts are driven by a camshaft chain, which in turn, is driven by the crankshaft via the intermediate shaft. The camshaft chain has inverted teeth, so called, "silent chain".

The chain drive is maintenance free.

The exhaust side's camshaft has a vibration damper, which guarantees optimum balance in the gear and chain sprockets.

Timing cover

Fig 2: Identifying Timing Chain Cover

Courtesy of VOLVO CARS CORPORATION

Number	Designation	Number	Designation
1	Chain guide	5	Coolant pump outlet
2	Induction camshaft	6	Hydraulic chain tensioner
3	Exhaust camshaft	7	Intermediate shaft
4	Coolant pump shell

The timing cover is cast in aluminum.

The coolant pump shell is integrated in the timing cover. This saves weight. The coolant pump is still driven by the auxiliary unit's transmission.

The chain us tensioned by a hydraulic chain tensioner, which is located in the timing cover. Oil injection pipes supply the chain with oil.