Speed Warning - Back from the Dead

[davepl]

I bought a speed warning cluster from member John H a couple of weeks back, then promptly destroyed it because I took the needle assembly too far apart. I know masking isn't perfect, but if you find yourself in this position, mask it, don't blow it apart.

Anyhow, TBONE the gauge specialist member was a huge help. First he had a spare needle assembly. I almost ruined that one too because I wanted to airbrush the needle... so I took it apart, just not as far. Take my advice, having done it twice: don't take it apart. I managed to get it painted and back on, but I have literally days into it.

Anyhow, the odometer was all yellowed. Tried to clean it without success, so I decided to transfer my original over. For some reason internally I discovered the thousands digit was locked at 6. And indeed, the truck has 76XXX miles on the odometer. I bet it just stuck at 76K and wrapped around perpetually every 1000 miles.

Tried to take that apart and fix it, but could never find the problem. I decided to then pull an odometer out of my Pontiac stash. Had to shorten the shaft a little but otherwise seemed to interchange. The little plastic retainer had shattered but I didn't need to make a new one because this speedo head has the full rail for each odometer digit tab (some have a gap for the thousands and rely on the plastic thing).

Sadly, when I pulled the face of the speedo all 6 little gears for setting the speed warning and some shims fell right out, as they're actually retained by the face. TBONE to the rescue again as he was able to send me a photo showing the correct gear layout.

Once back together, I found the speed warning aspect didn't actually work. Just oxidation after all these years I guess, as I was able to clean up the spring contact with some laquer thinner and use some emory cloth on the pin of the speed warning needle contact and now its consistent and accurate.

So, long story short, I'll soon have it done. I'll post a photo of the whole cluster eventually. In the photo it looks like the base of the yellow needle is unpainted or a different color, but it's just the angle of the photo.

[TBONE1964]

Always glad to help Dave. I am happy you got it back together and functioning properly.

By the way, that is the nicest speed warning face I have seen in a while. They are extremely hard to find in that condition.

Looking forward to photos of the complete cluster.

Great work there,
Tom

[Andy4639]

Looks like you gotter done man! Good job. I had mine done by TBONE1964 great job on the cluster.

[davepl]

Does anyone (TBONE?) know how sensitive these are to the added weight of repainting them? This needle assembly in particular seem to have an counterweight balance. If that counterweight's mass was calculated based off a weight that I've now changed, I wonder how much, if any, it'll affect its accuracy or linearity.

[TBONE1964]

Originally Posted by davepl

Does anyone (TBONE?) know how sensitive these are to the added weight of repainting them? This needle assembly in particular seem to have an counterweight balance. If that counterweight's mass was calculated based off a weight that I've now changed, I wonder how much, if any, it'll affect its accuracy or linearity.

Hi Dave,

I don't the very little bit of paint you use on the needle will cause an inaccuracy but you do bring up a valid point and it is possible that paint build up on the needle will throw of the calibration of the speedometer.

Here is a little tool I use in my shop to confirm speedometer accuracy. Now that you have asked, I need to do an experiment with a known accurate speedometer and pile on some paint and see what happens. It will make it slow if anything.

Not sure when I would have time at this point but I will do a test in the future.

I use this tool also for each and every gauge cluster I sell to insure accuracy, no noise and no needle bounce.

Hope this helps.
Tom

[jabborabbo]

Originally Posted by TBONE1964

Hi Dave,

I don't the very little bit of paint you use on the needle will cause an inaccuracy but you do bring up a valid point and it is possible that paint build up on the needle will throw of the calibration of the speedometer.

Here is a little tool I use in my shop to confirm speedometer accuracy. Now that you have asked, I need to do an experiment with a known accurate speedometer and pile on some paint and see what happens. It will make it slow if anything.

Not sure when I would have time at this point but I will do a test in the future.

I use this tool also for each and every gauge cluster I sell to insure accuracy, no noise and no needle bounce.

Hope this helps.
Tom

Just out of curiosity...where did you get that fine piece of test equipment?

[TBONE1964]

Originally Posted by jabborabbo

Just out of curiosity...where did you get that fine piece of test equipment?

I actually bought it from the speedometer shop that is here local to me in Michigan. Scott Speedometer Service. They have been in business for over 60 years. I got to be very good friends with the owner over the years. The business would buy equipment from other speedometer shops that were going out of business.

I feel lucky to have it as they are getting harder to find. It did not come cheap either

[jabborabbo]

Originally Posted by TBONE1964

I actually bought it from the speedometer shop that is here local to me in Michigan. Scott Speedometer Service. They have been in business for over 60 years. I got to be very good friends with the owner over the years. The business would buy equipment from other speedometer shops that were going out of business.

I feel lucky to have it as they are getting harder to find. It did not come cheap either

I'll bet it wasn't cheap...cool piece of test equipment!