Speedo Drive

andrewh · Post by **andrewh** » Thu Jan 22, 2015 4:06 pm

that is tight, I see what you mean. Oh well, I will check the speedo cable first off I actually wonder whether the speedo inner cable was not fully pushed home into the angle drive and therefore not driving correctly. I need to as you say investigate a bit more. thanks as always David, photo is brilliant help,

andrewh · Post by **andrewh** » Thu Jan 22, 2015 4:45 pm

snap

before my restoration obviously

christopher storey · Post by **christopher storey** » Thu Jan 22, 2015 6:54 pm

Andrew : I should try David's suggestion from underneath first. I only have experience of 4.2 cars, but the same problem often arises , albeit on the RH rather than LH side. However, I've always found it possible to lever the box across the car enough to get the angle drive out. However, if I may give a tip, use a piece of 2 X 1.5 wood about 2 feet long rather than a crowbar - there is much less chance of damaging anything. If this doesn't work then I'm afraid there's no real option but to remove the left seat and the console, and cut a new hole - I do this by drilling radially around a point centred on the angle drive using a 2.5mm bit and then using tin snips, finishing off with a dremel

andrewh · Post by **andrewh** » Thu Jan 22, 2015 7:36 pm

Thank you Christopher, that's good advice. I am trying to arrange To borrow a lift and have a good look from underneath. I am struggling to remember ever tightening up the cable onto the angle drive so it may have fallen off! These things come to try us

Post by **Heuer** » Thu Jan 22, 2015 9:27 pm

christopher storey wrote: I do this by drilling radially around a point centred on the angle drive using a 2.5mm bit and then using tin snips, finishing off with a dremel

I would use a Q-max cutter as it saves time and produces a clean round cut to suit whatever rubber bung you intend to use.

christopher storey · Post by **christopher storey** » Fri Jan 23, 2015 9:26 am

I'm sure that is a neater solution if you have a set of rotary cutters, although I would worry a little about the bits going everywhere over his new trim - perhaps some gaffer tape over the cut area is the answer

PeterCrespin · Post by **PeterCrespin** » Fri Jan 23, 2015 9:57 am

There will be more swarf produced by cutting a ring of 2.5mm holes and snipping / trimming / abrading than by cutting using a hole cutter. However, hole cutters use a pilot bit and if you centre on the drive you might damage it with the protruding drill. I would still use a cutter though for neatness.

However, I wouldn't do anything unless/until it was proven to be necessary. I don't recall if the car is a runner but has the cable been observed to turn with the rear wheels in the air? Is it the correct oength and rightcway round? Has the inner cable been removed, checked, reinserted all the way home? Is there resistance to turning from the top end (apart from slight 'wind-up'? A lot can be checked sans removing speedo angle drive. Is it fully screwed on? Is the cable fully screwed on? I'm assuming the speedo has been proven to work.

Post by **Heuer** » Fri Jan 23, 2015 10:25 am

I have to admit the Q-max cutter would only work if there was space behind it and there is not so it is not an option unless the gearbox is out.

Agree with Pete, more investigation before taking drastic action and the cable is the first suspect.

288gto · Post by **288gto** » Fri Jan 23, 2015 2:44 pm

PeterCrespin wrote:There will be more swarf produced by cutting a ring of 2.5mm holes and snipping / trimming / abrading than by cutting using a hole cutter. However, hole cutters use a pilot bit and if you centre on the drive you might damage it with the protruding drill. I would still use a cutter though for neatness

IF you do unfortunately end up using this type of hole cutter there is way of using it without the pilot drill Peter. Firstlty cut a hole in a piece of 12mm ply then take the pilot drill out and clamp the ply to the transmission tunnel in the desired position as a guide. Place a further piece of ply on the inside of the tunnel to protect things as the cutter goes through.

Simon

andrewh · Post by **andrewh** » Fri Jan 23, 2015 3:31 pm

this is looking more and more of a nightmare the more I get into it!

Basically I stripped out all the console in order to take the gearbox aperture cover off and see whats going on. Err no. I had asked the trimmer to use sound deadening material under the carpet and of course he has stuck it all over the cover and you cannot remove it. Its stuck like , well like a very sticky thing. I cannot even see the screws or the seam to cut along to release it. Access from below is hampered by the large foam that I ordered to put on top of the gearbox to insulate fumes and noise etc. Its looking a lot like it would be easier and simpler to drop the gearbox just to sort this out, which I am not going to do so at the moment I am at a standstill whilst I re assess my predicament.

Yes Peter I have of course observed that the speedo cable is not turning whilst the car is driving and yes the inner has been removed and replaced fully. It is most definitely looking like the angle drive or the drive in the box which I doubt.

Post by **Heuer** » Fri Jan 23, 2015 3:47 pm

It is only insulation which can be easily replaced so cut and lever it off. Once you can get a corner lifted you should be able to work a scraper underneath. No matter what you end up doing it has got to come off so dive in!

David Oslo · Post by **David Oslo** » Fri Jan 23, 2015 3:56 pm

Applying some heat from a hot air gun (on low) or hair dryer (on max) should help to soften both the glue and the sound deadening. Sorry if this was totally obvious already....

On the upside, once said hole has been cut, and problem solved, you then have piece of mind for the next 20 years that if the angle drive should ever fail again, you have an easy access 5-minute solution to change it. On reflection, my gearbox is out, and now is probably a good time to drill all feasible access holes. Bung them up. Future proof the car.

JimmyS · Post by **JimmyS** » Fri Jan 23, 2015 4:34 pm

On reflection, my gearbox is out, and now is probably a good time to drill all feasible access holes. Bung them up. Future proof the car.

Good idea David, my gearbox is out too. If you are future proofing a 4.2, please post dimensions to the new hole's centre.
Thanks,
Jim

andrewh · Post by **andrewh** » Fri Jan 23, 2015 4:36 pm

thanks chaps I was being a bit of a girl. its off now and amazingly I was able to remove the angle drive easily with no need for a new hole it had the clearance necessary. And.....its broken. The male drive which locates in the gearbox was broken . Now I need to get a new angle drive and incase the cable is suspect I am going to fit a new cable as well as it may have been stressing the angle drive ?

I read that Speedograph Richfield sell them as do SNG. Any thoughts on these parts? thanks guys.

photos on their way

Post by **Heuer** » Fri Jan 23, 2015 4:41 pm

Well done Andrew! I would use Speedograph Richfield for this one as they specialise in making these gearboxes. They also sell the cable.

andrewh · Post by **andrewh** » Fri Jan 23, 2015 5:05 pm

the problem matting. Problem soon solved once I overcame the hurdle of pulling apart my mint new interior.

and the problem angle drive. must have just been old age

plenty of room to remove this, and after pulling my interior out I am not 100% sure but I think I could have done this from underneath.

Post by **Heuer** » Fri Jan 23, 2015 5:10 pm

Interestingly that gearbox looks a lot narrower than mine :?

Perhaps you need to be circumspect in finding a replacement otherwise it may not go back on? Correct one is BG2402/02

andrewh · Post by **andrewh** » Fri Jan 23, 2015 5:20 pm

yes, I just thought that! I wonder whether the length of the inner drive is the problem. Earlier in this thread it shows different length drives which maybe worth considering.

I am sure the cable was the fault as I recall the speedo needle wavering and I had the speedo refurbished at SR. I only kept the original cable as it was the correct sand colour whereas the new cables are black. Frustrating, but not half as frustrating as the thought I could get this out from underneath. Its time for me to buy a lift now, this could have been the final straw!

Post by **Heuer** » Fri Jan 23, 2015 5:49 pm

3.8 on left, 4.2 on right and the one SNGB seem to supply for all cars. If you had the Moss box version with the longer input would you be able to get it back on?

andrewh · Post by **andrewh** » Fri Jan 23, 2015 6:01 pm

Interesting the differnent lengths. Not sure whether the one you refer to as being Moss box would actually accommodate the length of that drive or indeed why it would need a drive that long. I estimate mine to be one of the other two , probably the short one. In fact I have a photo somewhere of it pre break. Let me dig that out, I am sure it would be original

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