[Healeys] Overdrive disengages

Mon Jul 3 14:29:41 MDT 2023

Hi Hank, I have the 100-6/3000 factory shop manual in it does not detail the procedure like the Haynes Manual. It has several important points.

1. Attach lead to terminal A and to a convenient earth point. If you attach to the fuse block the light will be bright or dim, but it never fully goes out when the setting is correct.

2. .048 is correct for my BT7.

With that information it was easy to adjust and all is perfect now. I can reinstall the tunnel, carpet and seats. It will be great to have the O/D fully functional.

Thanks for the help and sending the information.

John

From: Hank Leach [mailto:gradea1 at charter.net] 
Sent: Monday, July 3, 2023 9:06 AM
To: 'John Spaur' <jmsdarch at sbcglobal.net>
Cc: 'Bob Spidell' <bspidell at comcast.net>; 'healeys at autox.team.net' <healeys at autox.team.net>
Subject: RE: [Healeys] Overdrive disengages

Hi John-hope this helps-not an easy book to copy from (Roger Moment's book has a spiral binding which lays flat) In any event, here is the procedure to adjust the switch which as it says; once set its good unless you muck with the carbs.

I hope everyone agrees with this procedure-no one seems to criticize Haynes Manuals. I could not locate this diagram in the 100 workshop book, but I have seen it; probably in the 100-6/3000 manual. Regards, Hank

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From: "John Spaur" 
To: "Hank Leach"
Cc: "Bob Spidell"
Sent: Sunday July 2 2023 7:12:15PM
Subject: RE: [Healeys] Overdrive disengages

Hank, I have the workshop manuals but the Haynes guide may have something I am missing so please send it.

I will try resetting the static setting, fine setting it and then the throttle switch

Thanks!

John

From: Hank Leach [mailto:gradea1 at charter.net]
Sent: Sunday, July 2, 2023 6:49 PM
To: 'John Spaur' <jmsdarch at sbcglobal.net <mailto:jmsdarch at sbcglobal.net> >
Cc: 'Bob Spidell' <bspidell at comcast.net <mailto:bspidell at comcast.net> >; 'healeys at autox.team.net' <healeys at autox.team.net <mailto:healeys at autox.team.net> >
Subject: RE: [Healeys] Overdrive disengages

John- it is a .040 feeler gauge that goes under the throttle stop- That is equivalent to about 1/5 throttle opening. That is to set the throttle switch. 

The 3/16 drill bit is used to "static set" the position of the solenoid lever. I agree, that position is not alway ideal. Fine adjustment is made at the arm of the solenoid in which you get it to the maximum lift and then when it drops it clears the base about 1/32" at the same time gently pushing it in toward the casing to make sure it does not bind. Solenoid plunger must drop freely. I can send you that page from Haynes manual if it helps you to set the throttle switch Hank

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From: "John Spaur"
To: "Hank Leach", "Bob Spidell"
Cc: healeys at autoxteam.net <mailto:healeys at autoxteam.net> 
Sent: Sunday July 2 2023 6:01:07PM
Subject: RE: [Healeys] Overdrive disengages

I think I understand now.

I need to loosen the arm on the throttle switch, put a 3/16 spacer under the throttle stop and adjust the throttle switch so the test light goes out and then tighten everything up.

Correct?

-john

From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of Hank Leach via Healeys
Sent: Sunday, July 2, 2023 10:24 AM
To: 'Bob Spidell' <bspidell at comcast.net <mailto:bspidell at comcast.net> >
Cc: healeys at autox.team.net <mailto:healeys at autox.team.net> 
Subject: Re: [Healeys] Overdrive disengages

Bob's got the procedure.  Use a .040" feeler gauge (or 3/16 drill) under the throttle stop (1/5 of the throttle opening).  Connect a 12V test light to the fuse box and the top terminal on the throttle switch. (Good example in Haynes Manual page 124). Light should go out at this adjustment. Solenoid adjustment should be as Bob describes and work smoothly-no binding. Hank

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From: "Bob Spidell"
To: healeys at autox.team.net <mailto:healeys at autox.team.net> 
Cc:
Sent: Sunday July 2 2023 9:20:10AM
Subject: Re: [Healeys] Overdrive disengages

Hi John,

What keeps the O/D from disengaging immediately when you open the dash switch is the 'throttle switch.' When the O/D is actuated there is a parallel circuit that will keep the O/D activated until you press the accelerator pedal, theoretically preventing reverse thrust from damaging the O/D. The parallel circuit runs through the throttle switch on the scuttle (firewall); it sounds like you need to adjust it. It's a simple adjustment using a certain diameter--I don't recall it offhand, but I'll look it up if you need it--drill bit under the throttle stop levers. There's a small shaft off the throttle mechanism that opens this switch--it's just a set of points and a cam inside--with a lever with a pinch clamp. Just loosen the pinch clamp, set the bit under the throttle stop plate and tighten the clamp.

If you O/D is actuating consistently within a couple seconds or so then your solenoid, operating lever, operating shaft and ball 'valve' are correct. The 'stick-a-drill-bit-through-the-lever-into-the-housing' method is notoriously unreliable; the proper setting is best achieved by measuring the lift--IIRC, it's 1/32" but not sure--of the operating shaft at the top of the O/D hydraulic section.

Bob

On 7/1/2023 11:55 AM, John Spaur via Healeys wrote:

Hi All,

My overdrive is functioning again after replacing the accumulator housing and piston but it is exhibiting an odd behavior which I believe is related to the adjustment of the setting lever.

When I open the toggle switch, the OD will sometimes disengage immediately instead of waiting until I blip the accelerator. When I adjusted the setting lever, I could not use a 3/16” dowel to line up the lever with the hole in the housing I had to advance the lever clockwise a bit to get the OD to engage when the toggle switch was closed. This has always been the case and this issue is mentioned in some articles.

Do I need to fiddle with the setting lever adjustment some more? If so, do I rotate it clockwise or counter clockwise?

Any other thoughts?

TIA,

John Spaur

’62 BT7

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