Speedo changer for Columbia 2 Speed I am not familiar with these speedo changers. I got this with some 42-48 Columbia parts. I have heard big trucks also used them but they operate
backwards? I imagine that it probably needs to be disassembled and lubed and am wondering if and how to change it from truck to car style if possible? Also are new bellows / diaphragms available? Thanks |
Re: Speedo changer for Columbia 2 Speed 2 Attachment(s)
Try again
|
Re: Speedo changer for Columbia 2 Speed The truck ones used only 1 diaphram with spring return---same as truck 2 speed rear, the car columbia used 2 diaphrams, I think the whole innards have to be flipped over so it shifts between direct and turning the speedo faster
|
Re: Speedo changer for Columbia 2 Speed 1 Attachment(s)
Does this picture help identify this one
|
Re: Speedo changer for Columbia 2 Speed it's for truck -one vacuum diaphram, spring loaded return, most common on 42-47 big trucks--some had different ends or bushings in the end to adapt in later years, plus a little square drive connecter ----
|
Re: Speedo changer for Columbia 2 Speed I think the real issue will be the diaphragm . . . if it is shot (and it probably is), then you'll need to find some sort of replacement. This is the same issue with the dual-diaphragm Columbia units.
Hey - anybody know of a new/replacement that can be used in the dual-diaphragm Columbia setup? Inquiring minds need to know! LOL |
Re: Speedo changer for Columbia 2 Speed 1 Attachment(s)
The car changer has 2 diaphragms, the other are from big trucks, some are designed to fit only on the back of speedometer, others can go in between sections of cables
I have reground pliers jaws to open the crimps and replace diaphragm, sometimes re riveting the operating shaft, sometimes drilling and tapping for nut or small screw |
Re: Speedo changer for Columbia 2 Speed That's pretty cool. I've never heard of anyone tearing into the diaphragms and make repairs.
By chance do u have any photos? |
Re: Speedo changer for Columbia 2 Speed Quote:
That's good info. I have heard in the past that you can use the big truck unit by flipping the gears? Is that true? |
Re: Speedo changer for Columbia 2 Speed Yes, Gary Duff switched the truck ones for my 2 Columbia units for my 40s. Mine don't have any diaphragm. I believe he takes the gears off their shafts and switches them. You might talk to him.
There is a picture of the Columbia controls in my 40 coupe album. |
Re: Speedo changer for Columbia 2 Speed Quote:
Thanks Mike, My neighbor has a survivor 40 deluxe coupe with everything stock and his doesn't work so we are trying to figure these out. |
Re: Speedo changer for Columbia 2 Speed Found this in some of my records.
Maybe it'll help.https://uploads.tapatalk-cdn.com/202...53657fd06d.jpg Sent from my SM-G955U using Tapatalk |
Re: Speedo changer for Columbia 2 Speed Hey - anybody know of a new/replacement that can be used in the dual-diaphragm Columbia setup? Inquiring minds need to know! LOL
Sure, get some NOS choke diaphragms and modify them to fit, that is what I did and works like a charm. |
Re: Speedo changer for Columbia 2 Speed Quote:
|
Re: Speedo changer for Columbia 2 Speed Any early seventies GM Rochester 2-barrel diaphragm would work, will see if I can find the part number for you. Requires some cutting, bending and mig welding to keep heat from damaging the diaphragm.
|
Re: Speedo changer for Columbia 2 Speed The choke pull-off I used is an aftermarket product CP452 by Avatar AIP Company. Listed applications: chev 1975-73 R1 250 engine, so the six cylinders. I would think that others would be adaptable too, just try to get two the same.
|
Re: Speedo changer for Columbia 2 Speed Quote:
I remember machining an adaptor and I think it was mounted backwards. Can't remember any more. G.M. |
Re: Speedo changer for Columbia 2 Speed Quote:
|
Re: Speedo changer for Columbia 2 Speed Quote:
Hope it helps . |
All times are GMT -5. The time now is 10:31 PM. |
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.