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[Healeys] Overdrive wiring question

Subject: [Healeys] Overdrive wiring question
From: bspidell at comcast.net (Bob Spidell)
Date: Mon, 4 Sep 2017 21:38:50 -0700
References: <51ff01d324c2$54f7d5e0$fee781a0$@roadrunner.com> <002d01d324ca$4f09ea80$ed1dbf80$@rr.com> <b3f834a2-ae06-6598-457e-0065286dbf96@comcast.net> <005c01d324eb$775e4e60$661aeb20$@rr.com> <20170903204030.4612180.89464.9263@gmail.com> <E44E8133C5AC44E783310D0B0ED0CCC3@KagsLaptop> <008c01d32579$fd12bad0$f7383070$@rr.com> <186fb978-eba5-022c-65eb-085774f163b4@comcast.net> <00e901d325cb$624e3e00$26eaba00$@rr.com>
I used the ol' 2x4 braced against the pedal to get the nominal setting 
(but I thought it required too much pedal and the OD didn't always 
deactivate when I assumed it would).? I think it's a bit of personal 
preference; I adjusted mine so just a quarter of a clutch pedal and a 
quick blip--less than a downshift--would disengage the OD.? Done just 
right, it's smoother than my best downshift, so I gotta believe it's OK 
on the internals.? This OD has almost 200K miles and the only problems 
(2) I've had with it were electrical.

Anyway, glad it's in the manual; I was beginning to wonder ...


On 9/4/2017 3:15 PM, BJ8Healeys wrote:
>
> The manual says:
>
> "Connect a low-consumption test lamp (a 12 volt 2.2 watt fascia panel 
> light bulb is suitable) [I made a test lamp out of a single filament 
> turn signal bulb and a spare bulb holder I had lying around] between 
> the top terminal "A" (Fig. G.13)[of the throttle switch] and a 
> convenient earthing point.
>
> ? The bulb should light when the overdrive and the ignition are both 
> switched on, and the gear lever is set in the third or top gear position.
>
> ? When the overdrive is switched off, the bulb should remain alight 
> with the throttle still closed.
>
> ? Progressively open the throttle by means of the accelerator pedal 
> until the light goes out. Check the position of the throttle opening 
> when this occurs:? it should be one-fifth open.? This position of the 
> throttle has been reached when a 3/16 in. (5 mm.) diameter rod can be 
> just passed between the throttle stop screw and the stop lever on the 
> HD type of carburetter, or when a feeler gauge of 0.048 in. (1.22 mm.) 
> thickness can be inserted between the throttle stop screw and the stop 
> on the H4 type of carburetter used on earlier engines."
>
> The manual procedure would account for any system slack, but it also 
> requires two people:? one to operate the pedal and another to monitor 
> the light and check the position of the throttle plates when it goes 
> out. It would also require access to the throttle plates, and an 
> estimate of what is "one fifth open".? If that is related to the 3/16" 
> rod, then why not just use the rod and adjust until the light goes out?
>
> I have an "overdrive warning" light just above the dash switch that I 
> installed back in the '80s when I didn't mind drilling a new hole in 
> the dash.? When the switch is adjusted properly, the light stays on 
> when the dash switch is turned off and then goes off with what seems 
> to me a reasonable movement of the pedal.? I would say it isn't 
> necessary to account for slack in the system when using the 3/16" rod.
>
> Steve Byers
>
> HBJ8L/36666
>
> BJ8 Registry
>
> AHCA Delegate at Large
>
> Havelock, NC
>
> *From:*Healeys [mailto:healeys-bounces at autox.team.net] *On Behalf Of 
> *Bob Spidell
> *Sent:* Monday, September 04, 2017 1:14 PM
> *To:* healeys at autox.team.net
> *Subject:* Re: [Healeys] Overdrive wiring question
>
> I'm working from memory--will check the manual later--but the way I 
> interpreted the instructions were to adjust the switch with the 
> throttles a spec distance--prob. the 3/16" as Steve mentions--opened.? 
> For some reason, I thought this should be achieved by pressing on the 
> accelerator pedal to achieve this setting which, of course, would pull 
> up any slack in the Rube Goldberg throttle mechanism.? So, I set it 
> this way but felt that it required too much pedal when disengaging the 
> OD.? I just fiddled with the adjustment to where the OD disengaged 
> with what I felt was appropriate pedal.? Maybe the 3/16" should be 
> measured without allowing for linkage slack, maybe not; does anyone 
> know for sure?
>
> Bob
>
>

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