Secondary Timing Chain Tensioner

The Jaguar Engine Timing Chain Tensioner, identified by part number C2A1512 and superseding AJ87694, AJ86343, and NCA2017BE, is a critical OEM component designed to maintain proper tension on the secondary timing chain. This oil-fed tensioner prevents slack, which can lead to the chain derailing, causing significant engine damage and disrupting crankshaft-to-camshaft timing. Symptoms of a failing tensioner can include rattling or clanking noises, especially on startup, and the illumination of the check engine light due to camshaft/crankshaft correlation fault codes. This part is described as being "secondary chain" specific and is noted to fit various Jaguar models including S-Type, Super V8, Vanden Plas, XF, XJ8, XJR, XK, XK8, and XKR. It is specified for the left side on S-Type, XF, XJ, XK Coupe, XK Convertible, and XKR models. Fitment is further refined by chassis/VIN ranges, with specific upper and lower bounds mentioned: From Chassis/VIN 019321, 814614, G49700, N52047 and To Chassis/VIN G49701, N52048. It is important to verify adequate oil volume and pressure when troubleshooting this component. It is crucial to note that this specific part number, C2A1512, *does not fit* the 2013 Jaguar XF 3.0L Sedan, as explicitly stated by one vendor. Additionally, some sources indicate fitment for models including the 4.2L V8 engine from 2009-2010 XF and Super V8, and the XK8, Vanden Plas, XJ8, and XJR models.