Valve Train
WARNING: This page is about a different car, the 2011 Jaguar XKR175, 2011 Jaguar XKR, and 2010 Jaguar XKR. However, it is still accessible from the selected car via links, so may be relevant.
| Item | Description |
|---|---|
| 1 | Inlet camshafts |
| 2 | Exhaust camshaft |
| 3 | Inverted tooth timing chain |
| 4 | Nylon chain guide |
| 5 | Auxiliary chain tensioner |
| 6 | Auxiliary drive chain |
| 7 | Oil pump drive |
| 8 | Auxiliary drive camshaft |
| 9 | Timing chain tensioner |
| 10 | Tensioner lever |
| 11 | VCT unit |
| 12 | VCT solenoids |
The lightweight valve train provides good economy and noise levels and is chain driven from the crankshaft.
Double overhead camshafts on each cylinder head operate the valves. For each cylinder head, an inverted tooth timing chain transfers drive from the crankshaft to the VCT unit on the front of each camshaft. Graded tappets enable setting of inlet and exhaust valve clearances.
Each timing chain has a hydraulic tensioner operated by engine oil pressure. The chain tensioners incorporate a ratchet mechanism, which maintains tension while the engine is stopped to eliminate start-up noise. The chains are lubricated with engine oil from jets located at the front of the engine block. Nylon chain guides control chain motion on the drive side.