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J D O Instruments
Classic Car Instrument Repairs ( Est 1963 )
Tele: (UK) 01535 672125 Mobile / SMS: 07831 886545
Fixed price repairs for most British & European Classic Instruments
48 hr service available... Why pay more & wait longer ! no vat
48 hr service available... Why pay more & wait longer ! no vat
‘Good luck with your project’... Enjoy your classic motoring...
Fixed price repairs are based on the assumption that unit/s received
are ‘original & complete’... a surcharge may be applied to cover
missing parts etc... If in doubt send in the unit for inspection
Fixed price repairs are based on the assumption that unit/s received
are ‘original & complete’... a surcharge may be applied to cover
missing parts etc... If in doubt send in the unit for inspection
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press F11 again to revert to normal view contact the webmaster
check that you are looking @ the latest version... click here
Tip! Press F11 for a full page view @ 1024 x 768 screen resolution
press F11 again to revert to normal view contact the webmaster
Jaguar XK 120 ( 1948 / 54 )
909M
Payment options
Continued from previous page
If you are still ‘Building your car’
The Speedo calibration can still be established providing you know the following information ...
Axle / Diff-ratio # / Circumference of a fitted tyre ( correctly inflated ) / Number of turns the
‘Gear box Speedo output’ makes for 10 turns of the ‘ Prop-shaft output ’ *
*( don’t forget to take any ‘RIGHT ANGLE DRIVES’ into account e.g. Some drive units are not always 1:1 ! )
# To establish the ‘Axle / Diff-Ratio’ ... Lock one wheel / hub & turn the other wheel / hub 20 turns
( 10 turns for LSD... without locking a wheel / hub ) take up the slack first... ( approx ½ turn )
Count the ‘Prop-Shaft’ turns & divide by 10 to give the ‘Axle / Diff-Ratio’ ...
e.g. 37 turns = 3.7:1 & 42.5 turns would be 4.25:1 etc
( if any of the above is not clear please ring / email for help / advice )
If you are still ‘Building your car’
The Speedo calibration can still be established providing you know the following information ...
Axle / Diff-
‘Gear box Speedo output’ makes for
*( don’t forget to take any ‘RIGHT ANGLE DRIVES’ into account e.g. Some drive units are not always 1:1 ! )
# To establish the ‘Axle / Diff-
( 10 turns for LSD... without locking a wheel / hub ) take up the slack first... ( approx ½ turn )
Count the ‘Prop-
( if any of the above is not clear please ring / email for help / advice )
Return to previous page
Calculation page
Re-Calibration surcharge