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Speedo/trip recorder drive #655315
10/08/20 03:42 PM
10/08/20 03:42 PM
Joined: Jun 2010
Posts: 17
N
nicmog Offline OP
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nicmog  Offline OP
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Hello- looking for some advice. My '82 4/4 4 seater (4 speed CVH) Spedo/trip recorder stopped working the other day. Presumably its the same cable driving both but where does it drive from at the other end (car is not accessible at the moment)? Is it likely to be the cable or drive? The Speedo has been wavering around for a long time so presumably it was only a matter of time before this happened... Thanks for any help.

Re: Speedo/trip recorder drive [Re: nicmog] #655332
10/08/20 04:26 PM
10/08/20 04:26 PM
Joined: Jul 2019
Posts: 1,237
L
Luddite Offline
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I have no idea which speedo type is fitted to your car, however...

Assuming it is possible that your mention of trip may be the register of overall miles covered which may have stopped working but the speed indication may still be..? In that case it may well be the speedo head that has issues. As for the wavering speed indication, were it that alone it might be worth replacing the cable, I had a wavering speedo needle which was cured with cable replacement.

However when you mention TRIP.. if you are relating to a mechanical re-set to zero trip journey indicator... That perhaps being the case, it may be that the spring loaded reset plunger has stuck in the compressed position thus inhibiting the miles covered being registered...?

Of course I have been wrong before.. oldgit

Re: Speedo/trip recorder drive [Re: nicmog] #655354
10/08/20 05:40 PM
10/08/20 05:40 PM
Joined: Nov 2018
Posts: 2,087
Northants, UK
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All this instructions are based on your system being similar to my 1972 set-up. It may not be!

First thing I'd do is to disconnect the speedo cable from the back of the speedo. Let it dangle into the cockpit and then go for a drive (with a passenger if possible).

If the cable end is still spinning when you drive then the problem is likely to be with your speedo.

However, get your passenger to lightly hold the cable and put a tiny bit of pressure on it - if it carries on spinning then it's definitley the speedo. It it starts slipping then the speedo is probably OK

If the speedo is duff - there are several places that fix them. Melvyn Rutter offers the service, and there's Caerbont in Wales.

If it isn't spinning, or it slips as above then it's either the cable/ the 90 degree drive adaptor, or the gear drive.

On mine, the speedo attaches to the gearbox on the drivers side - there's a cut out on the gearbox cover. I made mine bigger to make access easier.

Disconnect the cable - you can then check if it's OK or broken by spinning by hand.

If the cable is OK, then it's probably the 90 degree adaptor. These are a bugger to get hold off. I'll link to a thread where I finally managed to fix mine after several months of frustration!

If the 90 degree adaptor is OK, then there's a chance that the worm gear on the gearbox drive has stripped a few teeth. These are fairly easy to replace and there are several online guides.

Apologies if your 1980 set up is different, but some of the principles will be similar.


1972 4/4 4 seater
Too many ratty motorbikes
Re: Speedo/trip recorder drive [Re: nicmog] #655355
10/08/20 05:43 PM
10/08/20 05:43 PM
Joined: Nov 2018
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Northants, UK
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Here it is - check out the last page for the solution if it is a 90 degree drive issue:

Speedo drive replacement


1972 4/4 4 seater
Too many ratty motorbikes
Re: Speedo/trip recorder drive [Re: nicmog] #655356
10/08/20 05:44 PM
10/08/20 05:44 PM
Joined: Jun 2015
Posts: 637
North Somerset, UK
Deejay Offline
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North Somerset, UK
Wavering is usually a sign of worn or dry speedo cable, before it finally breaks. Probably goes to the gearbox somewhere but I leave it to others to tell you exactly where. You could always undo it from the back of the speedo and extract the flexi-drive from the outer to see if it has a broken end.


Doug

2011 +4 in Rich Maroon
1972 750 “ComDom” sprinter
1958 Triton 650
1992 Triumph Trophy 900
Re: Speedo/trip recorder drive [Re: nicmog] #655357
10/08/20 05:56 PM
10/08/20 05:56 PM
Joined: Jun 2010
Posts: 17
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nicmog Offline OP
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Hi, thanks for the reply. Its the speedo, overall mile recorder and the trip recorder that have stopped working and all at the same time. This is the old Smiths one with geared mileage recorders. Thanks.

Re: Speedo/trip recorder drive [Re: nicmog] #655358
10/08/20 05:59 PM
10/08/20 05:59 PM
Joined: Jun 2010
Posts: 17
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nicmog Offline OP
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nicmog  Offline OP
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Posts: 17
Thanks all, very helpful. Will work from the top down as TBM's instructions and see where I end up!

Re: Speedo/trip recorder drive [Re: nicmog] #655360
10/08/20 06:18 PM
10/08/20 06:18 PM
Joined: Nov 2016
Posts: 81
Dorset
J
Jads Offline
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Posts: 81
Dorset
For what it's worth, you might find the speedo is OK. I had an '83 car with the same issue and it's a design fault. The problem is that speedo cable has to be bent in an extreme 90 degree angle as it comes out of the gearbox, (where the cable chews up), and goes inside the tunnel forwards to come back onto the speedo from the bulkhead. If that's the issue, a fix is simple. Remove the tunnel covering and on the drivers side there is a hole which accesses the speedo cable to gearbox area. Get a new cable and bring it into the car through the hole, then under the carpet and up to the back of the speedo. Worked perfectly for me, good luck but please PM if I can provide more info.
Cheers, John.

Re: Speedo/trip recorder drive [Re: Jads] #655363
10/08/20 06:31 PM
10/08/20 06:31 PM
Joined: Nov 2018
Posts: 2,087
Northants, UK
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Northants, UK
Originally Posted by Jads
I had an '83 car with the same issue and it's a design fault. The problem is that speedo cable has to be bent in an extreme 90 degree angle as it comes out of the gearbox, (where the cable chews up), and goes inside the tunnel forwards to come back onto the speedo from the bulkhead.


Do you not have the 90 degree drive adaptor like the earlier models?

Like these
[Linked Image]

or this:

[Linked Image]

:


1972 4/4 4 seater
Too many ratty motorbikes
Re: Speedo/trip recorder drive [Re: nicmog] #655366
10/08/20 06:51 PM
10/08/20 06:51 PM
Joined: Nov 2018
Posts: 2,087
Northants, UK
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Just looked at the listings on MR, and the post 1977 cables are not threaded both ends like mine, so the 90 degree bit may not apply.


1972 4/4 4 seater
Too many ratty motorbikes
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