Instrument Clusters - will '70 cluster work in a '74? (1 Viewer)

[PabloCruise]

Here's the link

https://forum.ih8mud.com/40-55-series-tech/160271-odometer-fix.html

Thank you!

In the mail to you, via UPS. I PM'ed your tracking number

And thank you!!!

 

[PabloCruise]

In the mail to you, via UPS. I PM'ed your tracking number

Score!

Arrived today

Thank you!!!

 

[PabloCruise]

Lou,

I just noticed the 1/10's digit wheel is black - do you know if this cluster has been apart before?

The odo in my '74 has a white 1/10's digit wheel.

Anyone else have a black 1/10's digit wheel?

 

[Luke111]

I have no idea, based on the info on the side of the speedo, thats probably not the speedo that came with the truck.
I hope it works for you.

Lou

 

[PabloCruise]

Got it - thanks man!

 

[PabloCruise]

Alright, so I dig into the speedo head Lou sent me to prepare myself for pulling my cluster out.

I got some dry graphite lube to rebuild the odometer with and then tore into my cluster.

My odometer was very sticky, crusty, hard to turn over.

I married my odometer with Lou's because I wanted to keep the white 1/10's digit wheel.

I also took some pictures!!!

I have to warn you all that I overdo things when it comes to documenting projects with pictures.

I use MUD a lot when I am on travel for work. So at a time when I am miles away from my Cruiser, I like to research my next project. For me, being able to see as much detail as possible helps me prepare my mind for my next project.

So here are a few pics of tearing down an odometer:

 

[PabloCruise]

So the above post shows the speedo head mounted in the cluster, the slotted screws that secure the outer glass onto the case, and then the phillips screws that keep the speedo guts in the housing.

You must remove all to get the speedo apart.

Next I will show the little metal clip that positions the odometer spindle in place. When Lou shipped me his, this clip had come loose and then got stuck somewhere else in the speedometer!

Lastly, I show how the odometer positions itself on the metal framework that the speedo face screws to

 

[PabloCruise]

Next up: showing where the metal clip rides on the spindle, removing the odo drive gear, and then removing the spring clip.

 

[PabloCruise]

That last pic in the previous post also gives you the orientation that the wheels need to follow in order to be successfully re-installed.

Each digit wheel has a side that has all teeth, then a side that has one set of teeth. Those little bitty plastic gears sandwiched between the wheels trip the next digit over every cycle...

Now lets look at the washer at the end of the spindle, disassembled for cleaning and orienting the intermediary gears for reassembly.

 

[PabloCruise]

Those intermediary gears only fit one way in order for everything to line up. They have tall teeth and short teeth in an alternating fashion. Having the short teeth oriented out worked for me because I was reassembling the odometer at 00000.0.

When reassembling, don't forget the little washer that rides between the drive gear and speedometer chassis. Then catch the metal tabs on the bracket that secures the speedo face.

I put graphite on the drivetrain for the odometer - a seies of gears and worm drives.

Don't forget to check your light bulbs while you are in there!

 

[PabloCruise]

So when I got everything put together, the odometer actually read 99,999.9



No worries! I rolled her over one mile while the and my son watched - wa-laa!!!

Getting that cluster back in takes some doing! I am glad I loosened the bolts holding the steering column up.

Took Pig for a quick drive (4 miles) and the odometer worked like a charm.

I hope this can help someone else...

 

[n2666s]

awesome thread Pablo......this is one I will need to file away....thanks for the documentation/pix

Lou

 

[PabloCruise]

awesome thread Pablo......this is one I will need to file away....thanks for the documentation/pix

Lou

Thanks! Like I said, I hope it can help out with future odometer rebuilds!!!

Think it is FAQ worthy?

 

[romegadave]

awesome thread Pablo......this is one I will need to file away....thanks for the documentation/pix

Lou

Well said...Needs to be a sticky as this belongs in the definitive swine thread.

 

[PabloCruise]

Does anyone have a '74 FSM?

I need to know what connection on the back is for the VSS (vehicle speed sensor).

I need this for my 3FE ECU (computer)

Thanks!

 

[Eric Ellis]

Does anyone have a '74 FSM?

I need to know what connection on the back is for the VSS (vehicle speed sensor).

I need this for my 3FE ECU (computer)

Thanks!

TJS sorry no FSM...but I am glad you pulled this up...I was out when you did it. It is a nice write up.

 

[Ming89FJ62]

This only a guess but I believe only odometers for Cali. emissions have/had the speed sensor built into it. Both my 78's have an "extra" spade lug on the back of the odo which ties into the emission "computer". I'll be pulling Arnold's tomorrow to replace the amp meter and will snap a photo.

 

[PabloCruise]

Does anyone know if you can plug a '76 gauge into a '74 harness?

https://forum.ih8mud.com/fj55-classifieds-corner/314577-beautiful-76-instrument-cluster.html

 

[PabloCruise]

Pighead referenced a thread he did on speedos recently, so copying that link, as well as our old friend cruiser_guy who built up a nice Piggy:

https://forum.ih8mud.com/fj55-iron-pig-preservation-society/457850-plays-speedos.html

https://forum.ih8mud.com/fj55-iron-...otm-cruiser-guy-guatemala-12.html#post5834164

 

[71greenpig]

Tried this today on a spare got the odo working but now the speed is not working it only winds if I reverse the drill...?