Page 833 of 3039
Engine System - General Information - Piston Ring End Gap
General Procedures Published: 11-May-2011
1. CAUTION: Do not mix up the piston rings. Install the
piston rings in the same position and location.
Using the Feeler Gauge, measure the piston ring gap.
The values given in the specification refer to a gauge
ring used during production.
Page 834 of 3039
Published: 11-May-2011
Engine System - General Information - Piston Ring-to-Groove Clearance
General Procedures
1. NOTE: The piston ring must protrude from the piston groove.
To determine the piston ring clearance, insert the Feeler
Gauge right to the back of the groove, behind the wear ridge.
Using the Feeler Gauge, measure the piston ring clearance. www.JagDocs.com
Page 835 of 3039
Page 836 of 3039
Engine System - General Information - Valve Stem Diameter
General Procedures Published: 11-May-2011
1. Using a micrometer measure the diameter of the valve stems.
If the measurements are not to specification, install a
new valve.
Page 837 of 3039
Engine System - General Information - Cylinder Head Distortion
General Procedures
Check Published: 17-Jun-2014
1. Using a suitable metallic straight edge and feeler gauge, measure the
cylinder head face in the areas illustrated. Note the maximum value.
2. CAUTION: Machine the minimum thickness of material from the cylinder
head to meet specification. If a selection of cylinder head gaskets are
available, increase the thickness of the cylinder head gasket by one
size.
NOTES: www.JagDocs.com
Page 838 of 3039
Prior to having the cylinder head machined, prior approval is
required by Jaguar or Land Rover engineering.
If the cylinder head requires machining, this must be carried out by
a local engineering company.
If the cylinder head exceeds the maximum value (0.2mm), the cylinder
head must be machined.
Page 839 of 3039

Published: 09-Apr-2014
Engine System - General Information - Cylinder Compression Test V8 S/C 5.0L
Petrol
General Procedures
Check
CAUTION: Before disconnecting or removing components, make sure the area around the joint faces and connections are
clean. Plug open connections to prevent contamination.
NOTES:
Removal steps in this procedure may contain installation details.
Some variation in the illustrations may occur, but the essential information is always correct.
The vehicle battery must be in good condition and fully charged before carrying out this procedure.
1. Refer to: Ignition Coil-On-Plug - V8 S/C 5.0L Petrol (303-07B Engine Ignition - V8 5.0L Petrol/V8 S/C 5.0L Petrol, Removal and Installation).
2. CAUTION: Make sure the fuel injection system is
disabled before carrying out a cylinder compression test.
Failure to follow this step may result in damage to the
vehicle.
Repeat procedure for the other side.
3. Crank engine for approximately five seconds to remove any remaining
fuel in the cylinders. www.JagDocs.com
Page 840 of 3039
4. NOTE: Dry cylinder compression test.
Install the compression test gauge.
5. NOTES:
This step requires the aid of another technician.
Print graphic number E164747 in step 11. Use this
graphic to record each cylinder compression figure.
The vehicle battery must be in good condition and fully
charged before carrying out this procedure.
Crank the engine for 10 seconds and record the figure
displayed on the compression test gauge. Make sure the
pressure is released from the compression test gauge after
each cylinder recording. Repeat the process for all cylinders.