Front Pulley/Vibration Damper

WARNING: This page is about a different car, the 2015 Jaguar XF, 2014 Jaguar XF, and 2013 Jaguar XF. However, it is still accessible from the selected car via links, so may be relevant.

ITEM	DESCRIPTION
1	Crankshaft Position sensor (CKP)
2	Reluctor ring
3	Pulley/vibration damper assembly
4	Washer
5	Bolt

The front crankshaft pulley is located on the end of the crankshaft and secured with a washer and bolt. The pulley drives the auxiliary drive belt for the ancillary components and incorporates a vibration damper and the reluctor ring for the CKP (crankshaft position) sensor.

NOTE: If the front pulley is removed, the engine must be set and held at TDC (top dead center) to maintain the engine timing.

The pulley incorporates an integral vibration damper which dampens vibration in the crankshaft produced by the combustion process. Each time a cylinder fires, torque is applied to the crankshaft via the pistons and connecting rods. The crankshaft deflects in reaction to the torque which creates a vibration when the torque is dissipated. The vibration damper absorbs the vibration reducing fatigue damage to the crankshaft.

The reluctor ring to the crankshaft position sensing is located on the rear of the pulley. The wheel has 58 teeth with a 2 teeth missing which in conjunction with the CKP enable the ECM (engine control module) to determine the rotational speed and position of the crankshaft. The position of the reluctor ring in relation to the crankshaft position is critical and special tools and procedures are required to obtain the correct correlation of the components. Refer to: Crankshaft Pulley (Removal and Installation).