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Austinsevenfriends › Austin Seven Friends Forum › Forum chat... v
Speedo

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Speedo
k8207418 Offline
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Joined: May 2022 Posts: 177 Threads: 45
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Location: Stafford
Car type: Ruby
#11
23-08-2022, 02:27 PM
What does TPM stand for ?
Turns/Teeth  per…
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John Cornforth Offline
Sevenner since 2002
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Joined: Aug 2017 Posts: 610 Threads: 19
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Location: Hampshire UK
#12
23-08-2022, 02:33 PM
Turns per mile
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Peter Naulls Offline
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#13
23-08-2022, 09:28 PM
Many years ago I had a speedo recalibrated by Speedy Cables, I've no idea how it was done but all the modification was internal and perfectly accurate. It's still spot on 30000 miles later and I also remember it being very reasonably priced at the time. Maybe I was just lucky with the available parts but it would seem preferable to having an external gearbox.
http://www.peternaulls.co.uk
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k8207418 Offline
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Joined: May 2022 Posts: 177 Threads: 45
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Location: Stafford
Car type: Ruby
#14
23-08-2022, 10:15 PM (This post was last modified: 23-08-2022, 10:16 PM by k8207418.)
I have taken the speedo out of the case and can see the input is a worm gear which drives a cog that has 20 teeth
I guess the calibration is changing the the number of teeth on this cog
I have an old/knackered speedo in my box of doom so I attempted to remove this cog however the circlip/ washer that holds the shaft in place was very difficult to remove without destroying it.
I would be interested to know if anyone has changed this cog to calibrate and if so how the clip is designed to be removed
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