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Speedomter cable at tranny won’t tighten fully

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Speedomter cable at tranny won’t tighten fully
#1
Bigdaddy32 Avatar
Bigdaddy32 Gold Member Paul Healy
Pittsfield, MA, USA   USA
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1966 MG MGB MkI
My cable at tranny won’t tighten fully any ideas on how to fix it . 66 mgb 3 synchro tranny. My speedomter is off by 13 mph and bounces a little. The tires are the correct size. Would Teflon tape work? Any ideas.

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Re: Speedomter cable at tranny won’t tighten fully
#2
AbingdonNerd Gold Member Jeffrey Delk
Hartwell, GA, USA   USA
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1950 MG TD
Is there supposed to be a distance washer at that fitting?

I seem to recall something about that.

I would contact MOMA, Speedograph-Richfield, or an instrument rebuilder and ask.


Jeffrey W. Delk
Hartwell. Georgia USA
1950 MGTD #2301
1954 MGTF 1500 #7673
1957 MGA
1971 MGB Tourer



Edited 1 time(s). Last edit at 2024-04-16 04:37 PM by AbingdonNerd.

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Re: Speedomter cable at tranny won’t tighten fully
#3
Bigdaddy32 Avatar
Bigdaddy32 Gold Member Paul Healy
Pittsfield, MA, USA   USA
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1966 MG MGB MkI
Could you show a picture or part number or is it a plain flat washer thanks

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Re: Speedomter cable at tranny won’t tighten fully
#4
Lynxman Tor Arne Hustvedt
Bardufoss, Norway   NOR
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1966 MG MGB GT
The threads on the gearbox end of my cable are mangled so mine will only screw on half way. It still does the job and my speed doesn't oscillate. It won't cause it to slip and read wrong.

EDIT:
Mine has a retrofitted overdrive and 4-syncro gearbox with the cable mounted without an angle drive. The parts overview for the early MGB does not show a washer.
https://www.moss-europe.co.uk/shop-by-model/mg/mgb-c-v8/electrical/gauges-instruments/gauges-cables-mgb-mgb-gt-1962-76.html
https://www.moss-europe.co.uk/internal-gearbox-3-synchro-non-overdrive-gear-selector-rods-mgb-mgb-gt-1962-67.html



Edited 1 time(s). Last edit at 2024-04-17 09:38 AM by Lynxman.

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Re: Speedomter cable at tranny won’t tighten fully
#5
ACCMGB Avatar
ACCMGB Silver Member David Y
Attleboro Falls, MA, USA   USA
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1969 MG MGB "Skeeter's B"
A distance washer is needed to prevent failure of the cable. Any washer that fits around the rotating cable and within the housing will work. Thickness should be around 3/32” if I remember correctly. The washer that came with my adapter was a copper sealing washer such as used on our hydraulic connections. If one doesn’t solve the problem use two. Others may have more specific information.

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Re: Speedomter cable at tranny won’t tighten fully
#6
bencii Silver Member Ben Colpitts
Eden Prairie, MN, USA   USA
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1966 MG MGB
1973 MG MGB
I believe the copper washer is needed if you have an angle drive in between the cable and the gearbox. If you look up the angle drive in Moss Motors you'll find some instructions on using the washer. Some have eliminated the angle drive and just used the longer overdrive cable. If you're not able to screw it all the way on then I suspect the plastic threads are cross threaded. You might try removing the 2 bolts that attach the plastic to the gearbox to inspect and repair if possible. When reassembling don't over tighten.

Edit. If you don't have the angle drive and aren't using the longer speedo cable then that is probably the problem.


Ben
1966 MGB Tourer
1973 MGB Tourer



Edited 1 time(s). Last edit at 2024-04-17 09:31 AM by bencii.


Attachments:
021-511.pdf    68.3 KB

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Re: Speedomter cable at tranny won’t tighten fully
#7
Lynxman Tor Arne Hustvedt
Bardufoss, Norway   NOR
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1966 MG MGB GT
I replaced my speedo cable the other day and it also wouldn't clamp the collar on the gearbox end so it was loose. Imade a little 3,5 mm thick washer (13 mm inner diameter and 18 mm outer diameter) with a gap so that I could slip it over the cable housing and inside the nut. Now the end is secure against the flange.You can probably make something similar by cutting some copper washers. I needed at least 3 mm (about 1/8"winking smiley thickness to get ti to hold securely. Maybe an O-ring can be used as it can be stretched over the flange first.



Edited 2 time(s). Last edit at 2024-04-22 04:38 AM by Lynxman.


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PXL_20240422_080941712.jpg

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