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Speedometer gear replacement.
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joecitizennn  



Joined: 12 Sep 2005
Posts: 2096
Location: no mans land

PostPosted: Mon Nov 23, 2009 5:46 am    Post subject: Speedometer gear replacement. Reply with quote

Clock stop rolling? As nice as it is to have your car stay "low mileage" you probably want to fix the odometer when it mysteriously stops. This is a common problem with our cars, and if you own one long enough it is bound to happen to you at some point.

Luckily it is a simple fix. When I did it, it only took 30 to 45 min.

The first step is to remove the gauge. It is not all that hard.
Remove the steering wheel.
Remove the plastic upper and lower column covers.
Remove the turn signal assembly.
Remove the two screws holding the dash bezel in place and pull it out enough to undo the speedo cable and all other connectors on the gauge, and pop the gauge out the front of the bezel.

With the gauge out use a screwdriver and work your way around the rim of the gauge bending the metal flange up so it can be removed. It is crimped on and must be removed to disassemble the gauge.

Remove the sensor from the back of the speedo and the two retaining screws. The internals will then slide out of the housing.


This is the little bugger that stopped my clock. The gear teeth were chewed off by the worm over time.

A good gear looks like this.

The gear can be removed by using a punch or a nail and driving the pin out from the opposite side of the red worm gear. This pic is of the donor speedo that I stole the gear from.

I put a little lube on the "new" gear and put it in place, pressing the shaft back in with a pair of adjustable pliers.

Everything is the reverse of removal. To crimp the ring shut I just used the same screw driver and worked my way around the edge pushing it flat. The metal is pretty soft so it was not too hard.
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BionicBalls  



Joined: 05 Jan 2009
Posts: 643
Location: Charlotte, NC

PostPosted: Sat Feb 20, 2010 5:23 pm    Post subject: Reply with quote

Can you tell me the part number or the number of teeth that the gear has? I would really like to go ahead and order the gear so that I have it sitting there waiting on me to rebuild the gauge.

Here is a link with all of the porsche gears listed:

http://www.pelicanparts.com/catalog/shopcart/944M/POR_944M_ELgage_pg3.htm
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BionicBalls  



Joined: 05 Jan 2009
Posts: 643
Location: Charlotte, NC

PostPosted: Sat Feb 20, 2010 5:25 pm    Post subject: Reply with quote

nevermind upon further inspection, pelican has a tool telling me that it's the M17.
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Scorpio  



Joined: 05 Jul 2007
Posts: 1956
Location: Brisbane, Australia

PostPosted: Sun Feb 21, 2010 5:41 pm    Post subject: Reply with quote

great how to joecitizen!
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thelm1249  



Joined: 13 Oct 2009
Posts: 7
Location: Spring, TX

PostPosted: Tue Apr 27, 2010 1:47 am    Post subject: Speedo Rebuild Reply with quote

I noticed you said to remove the turn signal arm and the steering wheel plastic housing, but on mine I can't figure out how to remove the plastic housing and the turn indicator seems to be plug in on the back. I must be missing something but what? I removed the four screws on the turn signal assembly but it won't come out. Can you help me?
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Grenadiers  



Joined: 20 Feb 2007
Posts: 3224
Location: Nelson, WI & Prescott, AZ

PostPosted: Tue Apr 27, 2010 2:23 am    Post subject: Reply with quote

I've removed the three-hole gauge bezel and the speedo without removing steering wheel. Not sure why this is listed as a requirement?
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thelm1249  



Joined: 13 Oct 2009
Posts: 7
Location: Spring, TX

PostPosted: Tue Apr 27, 2010 2:41 am    Post subject: Steering wheel Reply with quote

With my hands I need to remove the steering wheel just to get a little more room to get the the speedo cable.
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flosho  



Joined: 01 Jul 2004
Posts: 3158
Location: Eau Claire, Wisconsin

PostPosted: Tue Apr 27, 2010 2:42 am    Post subject: Reply with quote

Grenadiers wrote:
I've removed the three-hole gauge bezel and the speedo without removing steering wheel. Not sure why this is listed as a requirement?


Magician!

I can barely get the bezel out WITH the steering wheel removed!
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Grenadiers  



Joined: 20 Feb 2007
Posts: 3224
Location: Nelson, WI & Prescott, AZ

PostPosted: Tue Apr 27, 2010 2:56 am    Post subject: Reply with quote

You should have seen all the beer that magically disappeared yesterday!
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thelm1249  



Joined: 13 Oct 2009
Posts: 7
Location: Spring, TX

PostPosted: Fri May 07, 2010 1:53 am    Post subject: Speedometer Reply with quote

You mentioned about taking off the surround of the steering wheel and the turn signal assembly. How do you remove the surround?
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9XX Girl!  



Joined: 20 Sep 2009
Posts: 1617
Location: Cornish Riviera SW England

PostPosted: Sun May 09, 2010 10:00 am    Post subject: Reply with quote

flosho wrote:
Grenadiers wrote:
I've removed the three-hole gauge bezel and the speedo without removing steering wheel. Not sure why this is listed as a requirement?


Magician!

I can barely get the bezel out WITH the steering wheel removed!


Hmmm.... I managed to get the speedo out by:
1) putting my hand up behind the fuel and temp clock and pushing that out first
2) then unplug the fuel and temp clock and remove it completely
3) then I put my hand through the hole where the fuel and temp clock was to undo the speedo cable.
4) then push the speedo out.

the bezel and rev counter stay in place, cool how to though JC
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Peter_in_AU  



Joined: 29 Jul 2001
Posts: 2740
Location: Sydney, Australia

PostPosted: Mon May 10, 2010 3:04 pm    Post subject: Reply with quote

There's links in the Links section to some suppliers of replacement speedo gears.

It can be slightly more challenging removing the speedo in a right-hand drive car as the speedo cable is often pulled tight. Getting under the bonnet/hood and pushing more cable through the firewall helps.
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Johann  



Joined: 07 Aug 2016
Posts: 163
Location: Netherlands

PostPosted: Thu Dec 29, 2016 9:43 am    Post subject: Reply with quote

Thanks for the DIY, I just did my speedometer using it.
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mikeycrum14  



Joined: 19 Jan 2017
Posts: 108
Location: Juneau, Wisconsin

PostPosted: Sat Apr 01, 2017 1:53 pm    Post subject: Reply with quote

What is the part number for that gear. Mine just went bad and it's my dd car.
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Ozzie  



Joined: 12 Mar 2005
Posts: 4401
Location: Townsville, Qld. Australia

PostPosted: Sun Apr 02, 2017 9:22 am    Post subject: Reply with quote

My problem is the red worm gear slides down the shaft and disengages.
any ideas?
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