|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
03-07-2020, 08:59 PM | #1 |
Senior Member
Join Date: May 2010
Location: Snohomish,WA
Posts: 1,030
|
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 |
03-07-2020, 09:02 PM | #2 |
Senior Member
Join Date: May 2010
Location: Snohomish,WA
Posts: 1,030
|
Re: Speedo changer for Columbia 2 Speed
Try again
|
Sponsored Links (Register now to hide all advertisements) |
|
03-08-2020, 09:58 AM | #3 |
Senior Member
Join Date: May 2010
Location: on the Littlefield
Posts: 6,157
|
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
|
03-08-2020, 11:14 AM | #4 |
Senior Member
Join Date: May 2010
Location: Snohomish,WA
Posts: 1,030
|
Re: Speedo changer for Columbia 2 Speed
Does this picture help identify this one
|
03-08-2020, 04:55 PM | #5 |
Senior Member
Join Date: May 2010
Location: on the Littlefield
Posts: 6,157
|
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 ----
|
03-08-2020, 08:18 PM | #6 |
Senior Member
Join Date: Jan 2011
Location: Central Ohio
Posts: 5,064
|
Re: Speedo changer for Columbia 2 Speed
Sponsored Links (Register now to hide all advertisements)
Hey - anybody know of a new/replacement that can be used in the dual-diaphragm Columbia setup? Inquiring minds need to know! LOL |
03-09-2020, 09:15 AM | #7 |
Senior Member
Join Date: May 2010
Location: on the Littlefield
Posts: 6,157
|
Re: Speedo changer for Columbia 2 Speed
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 |
03-09-2020, 09:23 AM | #8 |
Senior Member
Join Date: Dec 2014
Location: Upper Peninsula, Michigan
Posts: 604
|
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? |
03-09-2020, 10:49 AM | #9 | |
Senior Member
Join Date: May 2010
Location: Snohomish,WA
Posts: 1,030
|
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? |
|
03-09-2020, 11:02 AM | #10 |
Senior Member
Join Date: Oct 2011
Location: Shelton, WA
Posts: 3,800
|
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. |
03-09-2020, 02:01 PM | #11 | |
Senior Member
Join Date: May 2010
Location: Snohomish,WA
Posts: 1,030
|
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. |
|
03-09-2020, 02:48 PM | #12 |
Senior Member
Join Date: Dec 2014
Location: Upper Peninsula, Michigan
Posts: 604
|
Re: Speedo changer for Columbia 2 Speed
Found this in some of my records.
Maybe it'll help. Sent from my SM-G955U using Tapatalk |
03-09-2020, 05:03 PM | #13 |
Senior Member
Join Date: Nov 2010
Location: Beamsville,Ontario,Canada
Posts: 482
|
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. |
03-09-2020, 10:28 PM | #14 |
Senior Member
Join Date: Jan 2011
Location: Central Ohio
Posts: 5,064
|
Re: Speedo changer for Columbia 2 Speed
Would you happen to know what year car and/or type of carb? That is a great idea - never thought of it - thanks! Any help you can give to point me in the right direction, just getting ready to rebuild a Columbia for my 32.
|
03-10-2020, 07:53 AM | #15 |
Senior Member
Join Date: Nov 2010
Location: Beamsville,Ontario,Canada
Posts: 482
|
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.
|
03-10-2020, 12:12 PM | #16 |
Senior Member
Join Date: Nov 2010
Location: Beamsville,Ontario,Canada
Posts: 482
|
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.
|
03-10-2020, 02:25 PM | #17 | |
Senior Member
Join Date: May 2010
Location: Florida and Penna.
Posts: 4,471
|
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.
__________________
www.fordcollector.com |
|
03-10-2020, 07:31 PM | #18 |
Senior Member
Join Date: Jan 2011
Location: Central Ohio
Posts: 5,064
|
Re: Speedo changer for Columbia 2 Speed
Thanks a bunch - that is exactly what I'll pickup - or something similar. Again, great idea to solve the problem.
|
03-15-2020, 01:36 PM | #19 | |
Senior Member
Join Date: Jul 2016
Location: Lake worth Florida
Posts: 1,095
|
Re: Speedo changer for Columbia 2 Speed
Quote:
Hope it helps . |
|
|
|
Sponsored Links (Register now to hide all advertisements) |
|