The following notes and pictures detail a selection of original documents relating to development of the original XJ13:
Preliminary drawing by George Buck - November 1963
XJ13 body - note the original, pre-1973, wheelarch profile (altered during the 1973 rebuild by Abbey Panels)
Extract from XJ13 log book - March 1967
Extract from XJ13 log book - March 1967
Extract from XJ13 log book - March 1967
The following quoted text is © Jaguar Daimler Heritage Trust and should not be copied without their permission.
"Car was run over a total of 82 miles 5.3.67
On return the following items were modified
1. Move oil cooler to front of car
2. Fit transmission cooler with pump (electric)
3. Modify engine breather system & fit catch tank
4. Modify engine lower sump panel
5.Change clutch for one with greater clamping load
6. Modify engine oil pickup and return spill oil to pressure pickup side of system
7. Return petrol tanks to Marstons for repair and investigation. Fit full clamping rings to external fittings
8. Modify front bump stop rubbers to new dimension
9. Reduce castor to 5 degrees. Toe in front wheels to 1/16" Modify steering rack to take rubber mountings
10. Bleed brake system
11. Improve method of securing rear of body to car
12. Engine removed and stripped. Found to have broken top rings.
13. Clutch unit sent to Borg & Beck. New unit with higher clamping loads refitted
Second test at MIRA on 16th April 1967
General car condition was good. After test the following work was done.
1. G/B (George Buck?) changes to give 4:1 crown wheel and pinion. G/Box number 251
2. Brake system checked over. Balance bar found to be fouling up (rectified). Wheel cyls changed. 2 1/4" dia Front 2 1/8" dia Rear. Thorough bleeding and new pads fitted. M/Cyls remain at 5/8" bore
3. Throttle sticking investigated. Found to be friction on metering head cam (modified). Throttle pedal and cable were remade and travel reduced. Load at pedal equals 11 lbs at 6" from pivot
Testing dominated by handling tests. Eventually abandoned due to rev counter drive sheared.
Third test at MIRA on 23rd April 1967 (35 miles)
Unable to test for extended period. Dewis missed gear. Suspect bent valves. Water blowing from overflow pipe in some quantity. After test, following work done
1. Remove engine and strip. Bent valves and both head gaskets blowing.
2. Shorten steering rack by .18 per side and recheck geometry to give least track interference
3. Replace 5/8" diameter M/Cyls with .7"
Complete flush of oil system including tanks. Fit new engine oil cooler No.37266
5. Fit new trans cooler twice area
Fit mechanical trans pump (not fitted)
Move existing rear view mirror to give better forward vision for driver
8. Reposition oil cooler pipes to give better access for camber adjustments
9. Remove flexible pipes on pedal box. Fit solid pipes to help reduce pedal travel
10. Gear linkage remade to increase (reverse?) action
11. Diagonal seat belts fitted
12. Inner metal panel covering engine removed to give clearance for engine intake trumpets on new engine
13. Water system revised. Header tank now feeds through 1" bore pipe direct to intake on water pump. Return from engine goes direct to rad. Small bore bleed from return pipe goes to header tank under water
14. Second set of dampers with revised bleed settings fitted
15. New white spot tyres all round
16. n/s petrol tank repaired for second time
17. Clutch slave cylinder changed
18. Drive shaft bearings changed
Fourth test - May 16th 1967 - 317 miles
Major changes from original build
Second stage engine with mechanical timing device fitted
4:1 final drive fitted
Brakes modified. Wheel cyls front 2 1/4"
Rear 2 1/8" M/Cyls .7 bore
Retraction on wheel cyls reduced to .005"-.007"
Oil cooler moved to front of car
Trans oil cooler with electric pump fitted
6.00 x 15H White Spot D15 tyres on front
7.00 x 15H White Spot D15 tyres on rear
To be continued .....