Erratic speedometer and warranty

If you have read through my blogs, you know that I have an intermittent speedo problem when the car gets warm/hot. So, as my 1 year warranty was about to expire, I contacted Caterham for assistance. They suggested a new speed sensor might do the trick, so they sent me one and I fitted it.

Its a trial & error process to get the right gap, so I recorded the settings with associated results. This time I used a feeler gauge to measure the gap.

Sensor                    Gap ”          Gap mm    Results


Initial setting     0.045″      1.143mm    Speedo works fine below 30mph, above 30 and speedo goes to zero.


out by 3/4 turn 0.067″      1.702mm   Speedo fails to register at any speed.


1 full turn in        0.037″     0.940mm   Speedo works fine below 65mph, above 65 and speedo goes erratic.

Indicator light ticking on & off cause speedo pertubations close to failure speed.


In 1/4 turn           0.027″    0,686mm    Appears to work at all speeds. However, on an extended drive, over 25 miles, speedo started going erratic at higher speeds.


With no further adjustment, I woke up early on Sunday morning and took the 7 for a drive. Ambient temp = 5C.  Drove about60 miles and speedo behaved perfectly.

On returning home, I left the 7 in the driveway for the morning, then about 2pm, ambient temp = 25C in the shade (hotter in full sun) I took the 7 for a short drive. The speedo was stuck at zero.

So, I’m going to get back to the Caterham guys…….

Dragon Lidy – at it again…

Template on left & first cut-out piece on right

Template on left & first cut-out piece on right

As you know, there is very little space to put things and Dot wanted to be able to fit a travel bag. Having seen some designs on the internet Dot set about making a bag to fit the 7. Here are the photos.

View from the back

View from the back

Side view

Side view

Inside view

Inside view

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