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Re: Speedo Not Working

Posted: Wed Jul 17, 2024 10:39 am
by deano
Cortina wrote: Tue Jul 16, 2024 7:22 pm If it helps you (or anyone else ?) I have "The Tool" to make round speedo cable inner into square. (from memory there are 2 size options). A most "interesting" device , and NOT the sort of thing most people have in their toolbox !

It weighs about 5 kg ... guess, and probably cost a fortune ... the things ones buys 40 years ago at public auctions !
Ooo, can we see a picture of it please?! :bounce:

Re: Speedo Not Working

Posted: Wed Jul 17, 2024 11:47 am
by knapmann
well my replacement cable has arrived from Roger Bray, its a foot longer than my original. Also unlike my original where it is crimped on only one end and you can pull out the cable, this new one is crimped on both ends. I could start cutting up the cable to try and make it fit but why should I? It should be correct. Its advertised as a 65-71 speedo cable... maybe its for LHD cars? however I would expect LHD cables to be even shorter than my RHD one if anything as the speedo is more central in the car. I cannot see how this cable would fit any 65-71 car with a 901/911 gearbox. Maybe it will fit with a load of slack in the tunnel or something but I dont want to spend hours trying to find out it doesnt work. Maybe its for a 915 gearbox car? im not sure where the speedo take off is on one of those cars.

Re: Speedo Not Working

Posted: Wed Jul 17, 2024 12:22 pm
by Cortina
deano wrote: Wed Jul 17, 2024 10:39 am
Cortina wrote: Tue Jul 16, 2024 7:22 pm If it helps you (or anyone else ?) I have "The Tool" to make round speedo cable inner into square. (from memory there are 2 size options). A most "interesting" device , and NOT the sort of thing most people have in their toolbox !

It weighs about 5 kg ... guess, and probably cost a fortune ... the things ones buys 40 years ago at public auctions !
Ooo, can we see a picture of it please?! :bounce:
Yes , bear with me while I find a camera etc ............... Still in it's original box !!!

Re: Speedo Not Working

Posted: Wed Jul 17, 2024 12:36 pm
by RobFrost
knapmann wrote: Wed Jul 17, 2024 11:47 am well my replacement cable has arrived from Roger Bray, its a foot loner than my original. Also unlike my original where it is crimped on only one end and you can pull out the cable, this new one is crimped on both ends. I could start cutting up the cable to try and make it fit but why should I? It should be correct. Its advertised as a 65-71 speedo cable... maybe its for LHD cars? however I would expect LHD cables to be even shorter than my RHD one if anything as the speedo is more central in the car. I cannot see how this cable would fit any 65-71 car with a 901/911 gearbox. Maybe it will fit with a load of slack in the tunnel or something but I dont want to spend hours trying to find out it doesnt work. Maybe its for a 915 gearbox car? im not sure where the speedo take off is on one of those cars.
a. The cable you took out may not be original. It may have snapped once before and been shortened, especially if it lacks the pressing on the speedo end of the inner worm, which prevents the worm pulling through towards the gearbox. The Roger Bray way is the original way, I believe, with the worm not removeable unless it has broken.

b. I'm sure the route will be quite different for LHD vs RHD cars as mine went through the bulkhead area which differs quite a bit between LHD/RHD.

c. surplus cable should not be a problem, provided you can find a slightly longer route for it without too tight a bend anywhere. I can measure my original (1970) cable if you want and confirm the length. I believe 1970 is indeed a touch longer than SWB cars at 2750 vs 2480mm but they sell the longer one as a one-size fits all.

Re: Speedo Not Working

Posted: Wed Jul 17, 2024 1:05 pm
by Cortina
Let's see if I can just insert 2 photos .... by the way , I lied about the weight ! (Tool is 9.56kg !)

Re: Speedo Not Working

Posted: Wed Jul 17, 2024 2:04 pm
by deano
Nice, thanks for posting the tool pics.

Looks handy, if one ever has a problem finding the correct length cable 8) :lol:

Re: Speedo Not Working

Posted: Wed Jul 17, 2024 3:01 pm
by SeanP

Re: Speedo Not Working

Posted: Wed Jul 17, 2024 4:02 pm
by knapmann
Hi Sean

my only concern is that this looks identical to the one I have from Roger Bray and is also advertised as 65-71. Ill have to send the one I have back and order this one but im expecting it to be equally incorrect.

In the mean time i have welded the two ends of my original cable back together and re-installed it... maybe I can run a sweep on how long it will last!

Re: Speedo Not Working

Posted: Wed Jul 17, 2024 5:29 pm
by RobFrost
knapmann wrote: Wed Jul 17, 2024 4:02 pm
Hi Sean

my only concern is that this looks identical to the one I have from Roger Bray and is also advertised as 65-71. Ill have to send the one I have back and order this one but im expecting it to be equally incorrect.

In the mean time i have welded the two ends of my original cable back together and re-installed it... maybe I can run a sweep on how long it will last!
Probably telling my nan how to suck eggs here but in case it's not obvious, I'd blow out the old sleeve with compressed air, wash with an evaporative cleaner such as carb or brake cleaner, blow out again, and re-lubricate with lithium grease, for the best chance of it lasting.

Re: Speedo Not Working

Posted: Wed Jul 17, 2024 8:09 pm
by SeanP
knapmann wrote: Wed Jul 17, 2024 4:02 pm
Hi Sean

my only concern is that this looks identical to the one I have from Roger Bray and is also advertised as 65-71. Ill have to send the one I have back and order this one but im expecting it to be equally incorrect.

In the mean time i have welded the two ends of my original cable back together and re-installed it... maybe I can run a sweep on how long it will last!
I fitted the carpoint one to mine after trying a few of the usual suspects offerings including Porsche. The carpoint one was the same length as the original. I have purchased a lot of parts from carpoint and must say that the quality and fitment of the parts that they supply is on par with the original porsche items, and often they are cheaper than most suppliers including delivery, remember you don’t pay the VAT on orders under £135 including delivery so I tend to wait and order several bits that I need.

I’ll give the welded one three mile's. It’s the last couple of feet up to the speedo that’s the cable killer!
The porsche offering I bought (read that as very long and expensive and used in the 74 on cars lasted all of about 300 yards before it snapped).

Re: Speedo Not Working

Posted: Wed Jul 17, 2024 11:44 pm
by knapmann
SeanP wrote: Wed Jul 17, 2024 8:09 pm
knapmann wrote: Wed Jul 17, 2024 4:02 pm
Hi Sean

my only concern is that this looks identical to the one I have from Roger Bray and is also advertised as 65-71. Ill have to send the one I have back and order this one but im expecting it to be equally incorrect.

In the mean time i have welded the two ends of my original cable back together and re-installed it... maybe I can run a sweep on how long it will last!
I fitted the carpoint one to mine after trying a few of the usual suspects offerings including Porsche. The carpoint one was the same length as the original. I have purchased a lot of parts from carpoint and must say that the quality and fitment of the parts that they supply is on par with the original porsche items, and often they are cheaper than most suppliers including delivery, remember you don’t pay the VAT on orders under £135 including delivery so I tend to wait and order several bits that I need.

I’ll give the welded one three mile's. It’s the last couple of feet up to the speedo that’s the cable killer!
The porsche offering I bought (read that as very long and expensive and used in the 74 on cars lasted all of about 300 yards before it snapped).
You win the sweep, 3 miles was pretty much bang on. Its dead already, was worth a try though!

Re: Speedo Not Working

Posted: Thu Jul 18, 2024 2:40 am
by RobFrost
I'd check by hand if the speedo is turning. Put the end of the core in and see how freely it turns, by hand.

There's a plastic cog within the speedo which degrades.

Sent from my SM-S918B using Tapatalk



Re: Speedo Not Working

Posted: Thu Jul 18, 2024 12:05 pm
by SeanP
It wont be the speedo as that is confirmed as working. Its the torque going through the length of spring wire (which the speedo cable is made of) along its length with dirt/rust/dried grease in the cable sheave combined with a new weak spot of it being welded together all causing binding/tension spots that have to be released

Re: Speedo Not Working

Posted: Thu Jul 18, 2024 1:21 pm
by Lightweight_911
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I've found in the past that inner cable breakage can also be aggravated by the outer cable being routed through too tight a radius ...

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Re: Speedo Not Working

Posted: Thu Jul 18, 2024 2:21 pm
by knapmann
Lightweight_911 wrote: Thu Jul 18, 2024 1:21 pm .

I've found in the past that inner cable breakage can also be aggravated by the outer cable being routed through too tight a radius ...

.
This is the problem with trying to fit a longer than standard cable in the car, even though im sure sellers will say they can still be made to work...