[MR2] MK2 Turbo Speedometer problem (cause found)

[Dennis McFayden]

Aaron,
 
This is correct. I found that the right angle adapter was binding when a small resistance was applied to the adapter output. I disassembled the adapter and found that apparently some water had seeped into the mechanism and had caused the problem. I removed all of the old contaminated grease and found that it no longer would bind. I still will not take a chance and reuse the adapter but will use one from a '89 Sc transmission. This adapter must be a fairly standard Toyota part. 
 
Dennis
 


--- On Thu, 9/10/09, Aaron Bunch <nitrusmr2 at yahoo.com> wrote:


From: Aaron Bunch <nitrusmr2 at yahoo.com>
Subject: Re: [MR2] MK2 Turbo Speedometer problem
To: "Dennis McFayden" <mr2garage at yahoo.com>
Date: Thursday, September 10, 2009, 8:55 PM


Your first guess is right. The right angle piece is binding and breaking the keyed pin.


Aaron Bunch    ATS Racing    http://www.atsracing.net
91 2.2 GT35R ATS Turbo MR2 - 607 rwhp @ 34psi
93 SMG Turbo MR2 291 rwhp @ 20.5 psi spare car
07 Tundra DC 5.7

"Just because you have the money to buy one, doesn't mean
you have the skill to drive one."  Steve Neese


--- On Thu, 9/10/09, Dennis McFayden <mr2garage at yahoo.com> wrote:

> From: Dennis McFayden <mr2garage at yahoo.com>
> Subject: [MR2] MK2 Turbo Speedometer problem
> To: "MR2 Email" <mr2 at mr2.com>
> Date: Thursday, September 10, 2009, 7:48 PM
> This problem started when the
> speedometer stopped working. My first test was to un-plug
> the speedometer cable from the transmission. I used my drill
> to drive the speedometer cable to check that component. The
> speedometer responded which indicated that the cable was ok.
> 
>  
> My next step was to try to move the end of the drive
> mechanism. I found that I could turn the drive mechanism
> without resistance. This was not a good indication. I
> removed the right angle adapter and the part that held the
> speedometer drive gear. I found that the pin between the
> adapter and the drive gear had bend. This bending also
> destroyed the drive gear. 
>  
> I figured that somebody most likely did not correctly
> install the pin between the adapter and the drive gear. This
> may not have been a correct assumption. 
>  
> After installing a new drive gear and pin I checked out the
> system. I had the car on rear jack stands and let the rear
> wheels spin. the speedometer indicated the correct speed so
> I figured I had fixed the problem. 
>  
> Well I was wrong. When my son went to drive the car he
> reported the speedometer was again not working. I made a
> quick check; pulled the speedometer cable and found I could
> again freely turn the pin in the drive adapter connected to
> the transmission. 
>  
> Anybody had a similar problem, solutions are requested?
>  
> My first guess is that the right angle adapter may be
> binding and causing the damage to the drive gear. 
>  
> Dennis  
> 
> 
>       
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