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    Posted: 17-October-2020 at 6:51AM
I noticed when I have driven my car the last few times my speedometer is not working correctly.  I know the RPM vs speed on my car and I noticed that the RPMs seemed slow for the given speed.  Sure enough, when I checked the speed against the GPS, the speedometer was reading much faster than it supposed to (ie says I am going 70 but only doing 60).   It seems like when I wound out the car to high speed, the speedometer was hesitant to drop back down as I slowed.  It almost acted as if it was "sticking" as the car slowed.  I also noticed at one point the needle bouncing over a 10 mph range even thought I was pretty steady speed wise.

So my initial thought is that the speedometer cable needs to be lubricated, but you would think that if that was the issue the speedometer would read slower not faster.  I was also thinking maybe the speedometer itself needs to be overhauled.  

Any thoughts on this?  
Vince

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Post Options Post Options   Thanks (0) Thanks(0)   Quote 72 RS 351 Quote  Post ReplyReply Direct Link To This Post Posted: 17-October-2020 at 11:19AM
These mechanical speedometers rely on a spinning ring to turn the dial/needle, there's a small gap between the two components. It's said that you should not touch those parts when it's all out, to keep skin oil off of them, which will affect the accuracy.

I'd guess something is amiss with the actual speedometer, the cable should be all or nothing, perfect or broken, being dry would make it drag a little, makes the needle jittery etc, not smooth.

I like the old type, you can take them apart and easily reset the odometer compared to later kinds that are hell to work with.

I'd say take it out and look it over closely, clean the spinning parts lightly with a clean paper towel and alcohol etc.
Don
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 72FordGTS Quote  Post ReplyReply Direct Link To This Post Posted: 18-October-2020 at 6:34AM
If this is the speedometer, I may just send it to Tachman to get it rebuilt.  I am not sure if anyone here has used him before?  I emailed him for a price.  Neither the speedometer or the cable have been touched on the car since new, other than having the cable disconnected for various repairs.

The speedometer is mostly smooth, other than like I described where it suddenly started bouncing about 10 mph at highway speeds.  A new cable is cheap, but I am not sure if the aftermarket ones are worthwhile or are junk like so many parts today.  

I was hoping to figure out which was the problem before I get the car stored in the next week or so.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 72FordGTS Quote  Post ReplyReply Direct Link To This Post Posted: 23-October-2020 at 2:51AM
No response from the Tachman.  Anyone know of a decent speeometer rebuild/recalibration service? 

The car is going away for winter on the weekend.  Anyone else have any ideas if this is a speedometer or a cable issue?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 72 RS 351 Quote  Post ReplyReply Direct Link To This Post Posted: 23-October-2020 at 3:40AM
How about a company that does speedometer upgrades, changing the face and speed range? Are there many of those, and are they easy to find? They would do calibrations for sure, how much who knows.

I had a business here locally that I had to use in the early 90's, I had an issue with my 86 Crown Vic police model. It was a good $75 I recall to adjust it, it had gotten off by several mph at highway speeds. That was in an old part of town and most of those have gone away here.
Don
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rockatansky Quote  Post ReplyReply Direct Link To This Post Posted: 23-October-2020 at 4:22AM
i'd have a look at it before jumping the shark, could be as simple as some fuzz in the gizmo?

Vince do you have the 'Northern' speedo with km's on the outside and miles around the inside?

any thoughts to changing the color and/or recal'ing it to a higher mph with new gauge faces?


Edited by Rockatansky - 23-October-2020 at 4:36AM
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 72 RS 351 Quote  Post ReplyReply Direct Link To This Post Posted: 23-October-2020 at 6:01AM
Ditto, if it hasn't been out in a long time, try cleaning the drum parts with rubbing alcohol and a lint free rag of some kind. If you do that, feel them first by hand and see if there seems to be anything on them, an oily feeling, or dust etc.
Don
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73 Ranchero Sport "72 front end", floor shift/console, planning EFI 351-3V &4R70W
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Post Options Post Options   Thanks (0) Thanks(0)   Quote californiajohnny Quote  Post ReplyReply Direct Link To This Post Posted: 23-October-2020 at 5:15PM
mine was jumping at low speeds come to find out the cable wasn't in all the way after having it apartConfused
 you can pull the trans end and check the plastic drive gear... i've seen worn teeth do that before, and spin it by hand see if it is smooth or sticky???
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rockatansky Quote  Post ReplyReply Direct Link To This Post Posted: 23-October-2020 at 6:37PM
good call Johnny, check both ends, pull the cable out of the liner for best visual Thumbs Up
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 72FordGTS Quote  Post ReplyReply Direct Link To This Post Posted: 24-October-2020 at 8:53AM
Thanks, great advice guys.  I took the cluster out and pulled the cable out of the sleeve. The cable seemed to turn fine to me, but the speedo end was pretty greasy.  What's the best thing to clean up the cable and lubricate it with before I put it back in?

I will look at the speedo a little more closely later. If it looks like I can just clean it up, I will do so. Otherwise, I will try to find a rebuild/recalibrate shop.  The gear on the tranny end looks okay.

Rock, the speedo is in miles, just like the US versions.  We didn't switch to metric until 1978, so all our cars were in miles until then.  However, my dad did put a sticker/overlay he got from the Ford dealer in the late 70s on the speedo that shows the big kms and small miles.  I will show snap a pic later and post it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rockatansky Quote  Post ReplyReply Direct Link To This Post Posted: 24-October-2020 at 2:56PM
Originally posted by 72FordGTS 72FordGTS wrote:

What's the best thing to clean up the cable and lubricate it with before I put it back in?


Grease? LOL

they used to have an air powered cable lubing tool that would push grease up the cable from the bottom and usually up into the speedo head and all over the inside of the cluster, if you're into that kind of thing?

does yours have the large diameter housing adapter that can rotate to mesh the driven gear to the output shaft, or am i thinking of some other kind of transmission?

i was pretty sure you'd find something on the bottom side since that's the last place it's been messed with AFAIK.

was the cable routed smoothly from the speedo bullet through the firewall?

could it just be dry on the top end?

if it's sticking up and winding up then releasing the energy that might cause the needle to bounce?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 72 RS 351 Quote  Post ReplyReply Direct Link To This Post Posted: 24-October-2020 at 3:27PM
Yeah, the cable needs to be moving smoothly inside the sheath, the right amount of proper grease etc. Any binding like from a bent spot or pinched section could make the cable bounce or wind up.

I'm not sure what the best grease would b, I'd want it as thin as possible but something that will survive and last for a decade and more.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 72FordGTS Quote  Post ReplyReply Direct Link To This Post Posted: 25-October-2020 at 8:56AM
I know grease, but what type is the question?  I also have heard graphite powder, also heard using ATF.  

I don't think mine has the large diameter housing adaptor.  The transmission end looks similar to this one:


The cable is routed smoothly and it seems to move smoothly in the sheath. I check to make sure that it wasn't damaged it looks okay.  
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Rockatansky Quote  Post ReplyReply Direct Link To This Post Posted: 25-October-2020 at 10:37AM
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Post Options Post Options   Thanks (1) Thanks(1)   Quote californiajohnny Quote  Post ReplyReply Direct Link To This Post Posted: 25-October-2020 at 2:10PM
 if it has goobs of thick sticky bearing grease you may need to try and clean out all that crap! atf or oil would work or graphite if its clean and dry (it could goob up with grease in there too) i'd say thin grease like white lithium type maybe? something that don't thicken up over time!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 72FordGTS Quote  Post ReplyReply Direct Link To This Post Posted: 26-October-2020 at 11:09AM
Thanks for the links Rock and for the advice John and Don.   I may try to get some speedometer specific lube.  I would tend to think a thinner lube might work better than a thick grease.  After fiddling with the cable, I am more convinced it's a speedometer problem though.  Like I said, the cable moves pretty smoothly and I saw no damage to the sheave.  To add fuel to the fire, my gas gauge started reading way low too.  It was full, but showing about 3/8's of a tank.

As for the speedometer, here is what it looks like.  As you can see, it has an overlay to show kms.  I doubt I can remove it now after being on there for over 40 years, so I might just keep it because it's kind of a unique piece.  It's not as noticeable in when in the car (the angle of this photo makes the outline of the overlay very obvious).

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Post Options Post Options   Thanks (0) Thanks(0)   Quote 72 RS 351 Quote  Post ReplyReply Direct Link To This Post Posted: 26-October-2020 at 2:35PM
200mph, cool. I'm old you know, I cannot read the fine print.

I'd like the speedometer to go to 140mph, that's a good figure for most cars.
Don
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rockatansky Quote  Post ReplyReply Direct Link To This Post Posted: 26-October-2020 at 3:07PM
might as well give it a new Instrument Cluster Voltage Regulator

say that real fast five times while chugging a beer Beer

and check / clean the contacts of the PCB

welcome to my world. it's not always something, it's always something else too
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 72FordGTS Quote  Post ReplyReply Direct Link To This Post Posted: 27-October-2020 at 11:24AM
Originally posted by Rockatansky Rockatansky wrote:

might as well give it a new Instrument Cluster Voltage Regulator

say that real fast five times while chugging a beer Beer

and check / clean the contacts of the PCB

welcome to my world. it's not always something, it's always something else too

Do you know where I can get one?  I guess just hunt for one on eBay? Now that I have the cluster out, I might as well give it a good once over.  I do have a new repro PCB, but my original still looks solid, which is why I haven't swapped it yet.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rockatansky Quote  Post ReplyReply Direct Link To This Post Posted: 27-October-2020 at 5:14PM
is this it?


and i just accidentally ran across speedo cables on Rockauto, cheap like <$15

under the Interior heading IIRC
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 72FordGTS Quote  Post ReplyReply Direct Link To This Post Posted: Yesterday at 11:43AM
Yes, that is it.  I just checked the part number in the catalog and it is correct for the gauge cluster cars (std gauages use a different part).  That is way cheaper than the NOS motorcraft ones on eBay.  I just hope it's not a made in China special.

Yeah, i saw the speedometer cables are still available.  I will try to lubricate mine first, as I question if the aftermarket ones are any good.  Parts all seem to be offshore junk.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 72 RS 351 Quote  Post ReplyReply Direct Link To This Post Posted: 12 hours 18 minutes ago at 1:16AM
Dorman parts are the current standard for later cars, and they are expanding to other makes and years. I wonder where those are made, because they make so much. Lots of it is appreciated, but much of it is low quality also.

I like that voltage regulator too. Is that for a 9v battery, I always wondered why they had those odd terminals?
Don
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