2010 JAGUAR XFR Crank

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 (variable camshaft timing) 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. VALVE TRAIN

1 VCT units 2 Intake camshaft VCT solenoid 3 Camshaft position sensors 4 Exhaust camshaft VCT solenoid The VCT system varies the timing of the intake and exhaust camshafts to deliver optimum engine power, efficiency and emissions. The timing of the intake camshafts has a range of 62 degrees of crankshaft angle. The timing of the exhaust
camshafts has a range of 50 degrees of crankshaft angle.
In the base timing position:

The intake camshafts are fully retarded.
The exhaust camshafts are fully advanced.

VCT Operating Ranges
Camshaft Valve Opens Valve Closes Intake 29 degrees BTDC (before top dead center) to 33 degrees ATDC (after top dead center) 207 to 269 degrees ATDC Exhaust 244 to 194 degrees BTDC 6 to 56 degrees ATDC The system consists of a VCT unit and a VCT solenoid for each camshaft. The ECM controls the system using PWM (pulse width modulation) signals to the VCT solenoids.
The torsional energy generated by the valve springs and the inertia of the valve train components are used to operate the
system. Variable Camshaft Timing

1 Oil pump outlet tube 2 Anti-drain valve 3 Oil cooler 4 Oil filter 5 Piston cooling jets 6 Timing chain lubrication jets 7 Oil evacuation tube 8 Oil pump 9 Oil temperature and level sensor 10 Oil pick-up The oil pump is attached to the underside of the windage tray. The input shaft of the oil pump is driven from the front of the
crankshaft, by the auxiliary chain, at 0.87 engine speed.

The oil pump draws oil from the sump pan through a centrally mounted pick-up pipe. The oil is pressurized and pumped
through an output tube to the cylinder block. After passing through an anti-drain valve and a plate type oil cooler, the oil is
filtered by a replaceable cartridge installed on the front of the RH cylinder head. LUBRICATION SYSTEM

6. CAUTIONS:


Only rotate the crankshaft clockwise.


Make sure that the crankshaft is fully locked.

Install the Special Tool(s): 303-1447








7. Using a suitable marker, mark the position of the crankshaft pulley as
illustrated.

















8.
9. NOTE: Discard the seal. www.JagDocs.com

10. Remove the Special Tool(s): 303-1447


















11.


















If required,
carefully
adjust the
crankshaft
position to
allow correct
installation
of the
special tool.

Install the
Special
Tool(s):
JLR-303-1621
















12.
CAUTION: Do not use excessive force when adjusting the crankshaft
position.


NOTE: If the crankshaft timing tool cannot be installed, adjustment of
the fuel pump camshaft timing will be required.

If required, carefully adjust the crankshaft position to allow correct
installation of the special tool.

Install the Special Tool(s): 303-1447 If the crankshaft timing tool cannot be installed, adjustment of the
fuel pump camshaft timing will be required.

Refer to: Fuel Pump Camshaft Timing Adjustment (303-01C Engine - V8 5.0L Petrol, General Procedures).

Engine - V8 S/C 5.0L Petrol - Valve Clearance Check
General Procedures
Check Published: 10-Jul-2013

1. Refer to: Battery Disconnect and Connect (414-01 Battery, Mounting and Cables, General Procedures).


2. WARNING: Do not work on or under a vehicle supported only by a jack.
Always support the vehicle on safety stands.
Raise and support the vehicle.

3. Refer to: Valve Cover LH (303-01D Engine - V8 S/C 5.0L Petrol, Removal and Installation).

4. Refer to: Valve Cover RH (303-01D Engine - V8 S/C 5.0L Petrol, Removal and Installation).

5. CAUTIONS:


Rotate the engine clockwise until the camshafts are positioned as
shown.


Do not rotate the crankshaft counterclockwise. The timing chains
may bind causing engine damage.


Camshaft lobes must be 180 degrees away from each valve tappet
or valve clearance will be incorrect.


NOTE: Using feeler gauge check the gap between the tappet and
the camshaft lobe and check against specifications table.

Using feeler gauge check the gap between the tappet and the
camshaft lobe and check against specifications table.
Repeat for the remaining valve tappets.

Installation

1. CAUTIONS:


Prior to installing the camshafts, position the
crankshaft 45 degrees ATDC cylinder 1A to prevent
valve/piston collision.


Make sure that the camshafts and camshaft bearing
caps are installed in their original locations.


Evenly and progressively install and tighten the
camshaft bearing caps.


NOTE: Lubricate the camshafts and the camshaft
bearing caps with EP90 oil (or 75/90 viscosity oil will
suffice) prior to installation.
Torque: 3 Nm




2. NOTE: Tighten the bolts in the indicated sequence.
Torque: 12 Nm











3. CAUTION: Only rotate the crankshaft clockwise.

Rotate the crankshaft untill the camshaft lobe on the valve being
checked is 180 degrees from the maximum opening position.


4. NOTE: If the valve clearance is incorrect, continue to the next step. If
the valve clearance is correct, continue to step 8.

Using feeler gauge check the gap between the tappet and the camshaft
lobe and check against specifications table.

5. CAUTIONS:


Do not use a magnet to remove the tappet.


Use the following formula to calculate the required bucket
thickness. Original thickness + measured clearance - desired clearance =
required bucket thickness.
Remove the tappet and measure the thickness.

Installation
1. CAUTIONS:


Prior to installing the camshafts, position the
crankshaft 45 degrees ATDC cylinder 1A to prevent
valve/piston collision.


Evenly and progressively install and tighten the
camshaft bearing caps.


Make sure that the camshafts and camshaft bearing
caps are installed in their original locations.


NOTE: Lubricate the camshafts and the camshaft
bearing caps with EP90 oil (or 75/90 viscosity oil will
suffice) prior to installation.
Torque: 3 Nm




2. NOTE: Tighten the bolts in the indicated sequence.
Torque: 12 Nm











3. CAUTION: Only rotate the crankshaft clockwise.

Rotate the crankshaft untill the camshaft lobe on the valve being
checked is 180 degrees from the maximum opening position.


4. NOTE: If the valve clearance is incorrect, continue to the next step. If
the valve clearance is correct, continue to step 8.

Using feeler gauge check the gap between the tappet and the camshaft
lobe and check against specifications table.

5. CAUTIONS:


Use the following formula to calculate the required bucket
thickness. Original thickness + measured clearance - desired clearance =
required bucket thickness.


Do not use a magnet to remove the tappet.
Remove the tappet and measure the thickness. www.JagDocs.com