[Healeys] Speedo cable routing.

Bob Spidell bspidell at comcast.net
Fri Nov 5 10:56:36 MDT 2021


re: "I wonder if the speedo cable’s routing was so far out of line that 
it needed a slight short cut to achieve its destination. My cable goes 
through a grommet to the left of the bottom left corner of the control 
box. Is that correct? Or should it take a more central route?"

Disclaimer: I've not owned nor worked on a RHD car.

Since the speedometer gearing is on the left/port side of the O/D 
housing--unless RHD cars are different--on a LHD car the cable has to 
make, in effect, a 'hard' 90deg left turn. Yet, besides the occasional 
glitch speedos in LHD cars work, well, OK (what matters is that routing 
isn't so drastic as to kink or bind the cable). I can't see any purpose 
for the optional hole as the speedo cable would make a more graceful, 
easier turn to the right in a RHD car. My LHD BN2 has its cable just 
wedged between the gearbox cover and the scuttle, unless I installed it 
wrong.

I can't imagine why /any /speedo cable would need to go through the 
scuttle/firewall, if that's what you mean by 'control box' (aka voltage 
regulator). Mechanical tach cables have to, though.


On 11/5/2021 9:04 AM, Simon Lachlan via Healeys wrote:
>
> Looking back through my files, I have contradictory info on this. So, 
> here goes…..
>
> My car is a RHD MkII BT7 with a centre shift box. It thus has the 
> fibre glass tunnel cover which, I gather, continued to the bitter end 
> in ’67.
>
> You may recall that I sent in a pic of my tunnel cover a few weeks 
> back and asked if it was an original or a latterly made repro. 
> Thankfully, you said that it was original but it was pointed out that 
> it had an extra hole. See attached. As I interpreted it, the “extra 
> hole” is to the right and the correct way in is through the centrally 
> located “correct routing for speedo cable”.
>
> Assuming that is correct, I am led to wonder for what purpose some PO 
> had drilled that extra hole……I wonder if the speedo cable’s routing 
> was so far out of line that it needed a slight short cut to achieve 
> its destination. My cable goes through a grommet to the left of the 
> bottom left corner of the control box. Is that correct? Or should it 
> take a more central route?
>
> Thanks,
>
> Simon
>
>
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