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baybus70
Samba Member
Joined: September 25, 2008
Posts: 39
Location: Liverpool, UK
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 Posted: Mon Oct 28, 2019 3:20 pm Post subject: 412 Speedo stuck |
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Trying to figure out why my speedo Needle is stuck. Having taken the speedo apart is very stiff to move.
Doesn’t look too much fun to start dismantling further so is there something obvious I’m missing.
Speedo has never worked since I owned the car.
Thanks
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raygreenwood
Samba Member
Joined: November 24, 2008
Posts: 21518
Location: Oklahoma City
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| Posted: Tue Oct 29, 2019 9:06 am Post subject: Re: 412 Speedo stuck |
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So...what exactly have you taken apart? Really there is only one place to tart taking one apart...and that is prying the bezel ring off...carefully.
So are you feeling resistance when you turn the input shaft section? Show us a picture of that please.
Its possible...have had a similar problem before...that there is a small amount of corrosion or grit or damage to the cable input coupling and its dragging on the body. A small amount of oil there or cleaning may help but show us a picture first please. Ray |
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titan3c
Samba Member
Joined: February 16, 2012
Posts: 568
Location: Coweta, Oklahoma
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| Posted: Tue Oct 29, 2019 10:52 am Post subject: Re: 412 Speedo stuck |
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| This may sound foolish, but if it hasn't worked since you owned the car is the speedometer cable connected to the front wheel? |
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baybus70
Samba Member
Joined: September 25, 2008
Posts: 39
Location: Liverpool, UK
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| Posted: Tue Oct 29, 2019 4:18 pm Post subject: Re: 412 Speedo stuck |
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| raygreenwood wrote: |
So...what exactly have you taken apart? Really there is only one place to tart taking one apart...and that is prying the bezel ring off...carefully.
So are you feeling resistance when you turn the input shaft section? Show us a picture of that please.
Its possible...have had a similar problem before...that there is a small amount of corrosion or grit or damage to the cable input coupling and its dragging on the body. A small amount of oil there or cleaning may help but show us a picture first please. Ray |
Thanks Ray
I took the bezel off without damaging it and gained access to the needle. Then removed the 3 rear screws to see inside but I’m not really sure what I’m looking for. Needle was stuck at 10mph and I can move it but it stays where you put it.
I put a square bit into the speedo cable socket and there’s more resistance than the bug speedo I compared it to. The needle doesn’t move at all When turned using the bit in the speedo cable socket.
Speedo cable is fine. I have a spare KM/H speedo I’ve tested in the car.
Here’s two pics.
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baybus70
Samba Member
Joined: September 25, 2008
Posts: 39
Location: Liverpool, UK
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| Posted: Tue Oct 29, 2019 4:25 pm Post subject: Re: 412 Speedo stuck |
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| titan3c wrote: |
| This may sound foolish, but if it hasn't worked since you owned the car is the speedometer cable connected to the front wheel? |
Cable is good. Tested with a spare Km/h speedo.
Plus needle was stuck above the stop. |
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raygreenwood
Samba Member
Joined: November 24, 2008
Posts: 21518
Location: Oklahoma City
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| Posted: Wed Oct 30, 2019 11:59 am Post subject: Re: 412 Speedo stuck |
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| Ok...as long as you have a spare...let this one sit for a while and dont turn it anymore. I have a box of them and will look inside to see what could be locked up thats repairable and get back to this. Ray |
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412STi
Samba Member
Joined: September 25, 2015
Posts: 23
Location: Germany
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| Posted: Wed Oct 30, 2019 2:45 pm Post subject: Re: 412 Speedo stuck |
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Hi
I think the mistake comes from one or more broken plastic gears.
These will become porous and crumble after all these years.
Give it to a good gaugedoctor to fix it.
_________________
Gerold
The morning brings a mystery, the evening makes it history
The oil can not be, was none in it. |
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baybus70
Samba Member
Joined: September 25, 2008
Posts: 39
Location: Liverpool, UK
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| Posted: Wed Oct 30, 2019 3:34 pm Post subject: Re: 412 Speedo stuck |
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| raygreenwood wrote: |
| Ok...as long as you have a spare...let this one sit for a while and dont turn it anymore. I have a box of them and will look inside to see what could be locked up thats repairable and get back to this. Ray |
Thanks. The KM clock isn’t ideal but it’ll work for now.
If it’s nothing simple I’ll send it off to a specialist here in the U.K. |
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