Date:         Mon, 4 Sep 2000 20:55:19 -0500
Reply-To:     John Rodgers <inua@HIWAAY.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         John Rodgers <inua@HIWAAY.NET>
Subject:      [Fwd: Odometer repair question]
Content-Type: multipart/mixed;



John Rodgers wrote:

> Mark Ingalls wrote:
>
> > Hi John,
> >
> > I read your speedo fix.   I have a couple questions if you have time.
> >
> > Does the pot metal gear have a indent that is supposed to keep it from
> > turning on the shaft? Or is it a press fit that loosens up?
>
> Mark, There is no indent in the potmetal gear to hold it to the shaft. It
> seems to be a simple press-on friction fit. An apparently for whatever reason,
> the gear loosens on the shaft a bit. When that happens, the counter wheels
> then have enough clearance between them to allow the shaft to move, and it
> falls from it's detent in the plastic plate at the end of the assembly
>
> I will try here to make a sketch using the key board to demonstrate what
> happens. First a description.
>
> When looking down at the face of the speedometer, the odometer assembly lays
> from left to right. From left to right on the shaft there is
> 1) Teflon drive gear -on shaft, (2) Spacer - on shaft, (3) Plastic Plate -
> stationary - shaft goes through the hole in it, (4) counter wheels - on shaft,
> ( 5) Pot metal gear - swaged to the shaft(friction fit) (6) Plastic plate -
> stationary - has hole through which the shaft sticks about 1/16" or less.
>
> View 1 -  proper operation
>        {}       [] ()()()()()(){|}  []
>       ==||||||||=|===========|=  <<< Shaft
>        {}       [] ()()()()()(){|}  []
>
> Again, left to right - drive gear, bushing, stationary plate, counter wheels,
> pot metal wheel, stationary plate with shaft through it.
> The spacer on the left, and the pot metal on the right keep everything tight
> so the shaft cannot move left or right.
>
> View 2 -
>        {}        []() () () () () ()   {|}  []
>      ==||||||||==|=============   |  <<< Shaft
>        {}        []() () () () () ()   {|}  []
>
> Note that in the second view the pot metal wheel has slipped enough to allow
> sloppy clearance between the counter wheels. This allows the shaft to move to
> the left and disengage from the support plate that it fits through.
> When the shaft drops from it support hole, the entire assembly cocks to one
> side, and disengages from the worm drive. Thus, no more mileage counting.
>
> View 3
>                     {}       [] ()()()()()(){|}  []
>  Finger>>} ==||||||||=|===========|=  <<< Shaft
>            __|    {}       [] ()()()()()(){|}  []
>
> A mechanical finger applied to exert slight pressure on the  end of the shaft
> should be enough to hold the shaft in place,
>
> Hope this helps.
>
> John Rodgers
> 88GL Driver

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