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Discussion Starter #1
Ok here is the question what happens if you drive more than 140 mph does it do any damage to the stepper motors?
thanks
frank
 

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We were out driving with the top down. Nice night to go topless. I stopped and put the top up when we reached our destination. I looked at the instruments before turning the motor off and the spedo hand was way past 140 and stayed there when I turned the key off. It took five starts and needle sweeps to get the hand to 0 out. Every thing worked as it should on the 30 mile trip back home...........Is this the dreaded stepper motors starting to go bad/ or / the iign switch starting to show it's problems? Almost 4 years of no problems since I got the R.

Birdmans
 

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We were out driving with the top down. Nice night to go topless. I stopped and put the top up when we reached our destination. I looked at the instruments before turning the motor off and the spedo hand was way past 140 and stayed there when I turned the key off. It took five starts and needle sweeps to get the hand to 0 out. Every thing worked as it should on the 30 mile trip back home...........Is this the dreaded stepper motors starting to go bad/ or / the iign switch starting to show it's problems? Almost 4 years of no problems since I got the R.

Birdmans
Stepper motor.
 

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SSR Pit Crew
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OEM Stepper motors were "low bid", C5-168.

We are now installing X27-168, much better and more reliable.

More you press accelerator increasing electric signal which moves needle up.

They are only "Close". Not truly accurate! Key, if they always read the same, all is good.

Dicktator

1. Stepper Motors
2. OEM C5-168
3. NEW replacement X27-168
4. That is all there is!
5. Electric signal on coil moves needle.
 

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Your pictures seem to show they are gear drive? What stops them from working? I doubt the wire winding's are going bad?...........Would then be gears or lack of lubrication? Not worth talking about as the new ones are so inexpensive. They would be on there way to the fix guy if the whole dash didn't have to be removed? Above my age and pain threshold. Too many horror stories of shops working on our trucks.....Who is the nearest member who would do the whole job.......

Birdmans, Maryland Home of the murder capital of the U.S.A.......BALTIMORE
 

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Actually it is the windings, NOT the gears.

Dicktator
O.K. SO it's the clear thin coating on all wires on electric motors, generator's ETC that keep what appears to be bare wires from touching each other and making a bad contact??? It seems to work without failer as billions of things are made this way? Even Telsa drive motors are wired this way. through heat & cold. Watched them made on U-TUBE. I sure wouldn't want my house wired this way????? ..........as one electrical inventor said, Imagine what we could do if we ever found out what electricity really [IS].?

Birdmans
 

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WHY would you want to? I'm sure something else will fail and be catastrophic WAY before the stepper motors act up. The casket will cost way more than the stepper motors.
Not clear on [want to---[what]? AND according to the reply's the stepper motor on the spedo [IS] acting up? Already said the instrument panel would be sent to be fixed if it wasn't so hard to get it out of the dash?

I have already told the wife a wood casket or rent a casket for the [family] only viewing. Do not drain my blood and put strange fluid in my body. I prefer to go into the ground before sundown only wrapped in linen cloth. I only agreed to [A] family viewing because I know she would do it anyway.

Bird
 

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May be wrong, but stepper motor really don't have anything to do with speed. Speed is sent to head from ECM. Stepper motors just sweeps all needles to zero them. Someone correct me if I'm wrong.
 

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No, the steppers have nothing to do with the speed of the vehicle other than display. They display (when working) the signal that is sent to them from the computer. They do more than sweep, the sweeping is something internal as a zeroing out procedure at start up, displays are active after the sweep.

I would have to disagree on the cause of the bad steppers. The issue is the gearing. I have 2 speedos sitting on the bench I am working on now, and I can rotate the needles and can tell you by feel which one is acting up. With power off, the bad ones drag or feel much tighter than the good ones. Windings would have nothing to do with that. I think either the plastic gears get worn and start locking up a little or the seating where they spin becomes worn or misaligned. Something is causing a mechanical resistance, not electrical.
 

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No, the steppers have nothing to do with the speed of the vehicle other than display. They display (when working) the signal that is sent to them from the computer. They do more than sweep, the sweeping is something internal as a zeroing out procedure at start up, displays are active after the sweep.

I would have to disagree on the cause of the bad steppers. The issue is the gearing. I have 2 speedos sitting on the bench I am working on now, and I can rotate the needles and can tell you by feel which one is acting up. With power off, the bad ones drag or feel much tighter than the good ones. Windings would have nothing to do with that. I think either the plastic gears get worn and start locking up a little or the seating where they spin becomes worn or misaligned. Something is causing a mechanical resistance, not electrical.
That is about what I said in post #11...gears locking up or binding in what one might call a plastic bearing? NOW I am thinking a bad signal from the computer? BECAUSE the cars & vans we built had the computer behind the glove box or right side kick panel. I HAVE A WATER LEAK that ends up on the passenger floor.........Where is the ssr computer located? I mean the spedo needle was straight down. WAY past 140. I did not see it when it happened. Just when I looked before turning off the motor. It took five [5] starts and sweeps to finally get the needle to zero......WITH EACH SWEEP IT CAME BACK A LITTLE MORE. The reason I kept starting the Truck. Each time a little further.

BIRD

Birdmans
 

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That is about what I said in post #11...gears locking up or binding in what one might call a plastic bearing? NOW I am thinking a bad signal from the computer? BECAUSE the cars & vans we built had the computer behind the glove box or right side kick panel. I HAVE A WATER LEAK that ends up on the passenger floor.........Where is the ssr computer located? I mean the spedo needle was straight down. WAY past 140. I did not see it when it happened. Just when I looked before turning off the motor. It took five [5] starts and sweeps to finally get the needle to zero......WITH EACH SWEEP IT CAME BACK A LITTLE MORE. The reason I kept starting the Truck. Each time a little further.

BIRD

Birdmans
The problem you state is very typical of a bad stepper motor, not the computer. I cannot think of any situation where the computer would send a bad signal and change the output at every key turn. On the other hand, I can see where there would be a change to the readout due to a mechanical issue, the stepper internal binding. Each sweep test brings it in a little closer and finally gets it back to where it should be .... for awhile. I have experienced exactly what you state in my own truck and it was definitely caused by the steppers.
 

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The problem you state is very typical of a bad stepper motor, not the computer. I cannot think of any situation where the computer would send a bad signal and change the output at every key turn. On the other hand, I can see where there would be a change to the readout due to a mechanical issue, the stepper internal binding. Each sweep test brings it in a little closer and finally gets it back to where it should be .... for awhile. I have experienced exactly what you state in my own truck and it was definitely caused by the steppers.
I did notice on a test drive today that on start the swing of the spedo-hand only goes to 140 M.P.H. Not way past it as mine was when I saw the problem. Everything is as brand new right now??????? We do seem to think alike? I thought binding from the start hence a bad stepped motor? . I Just couldn't believe the needle went so far/ as / it only sweeps to 140???

Birdmans
 
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