[Healeys] Overdrive disengages

[m.g.sharp at sympatico.ca]

Perhaps I am missing something, but 0.040” is not equivalent to 3/16”

 

From: Healeys <healeys-bounces at autox.team.net> On Behalf Of Hank Leach via Healeys
Sent: Sunday, July 2, 2023 1:24 PM
To: 'Bob Spidell' <bspidell at comcast.net>
Cc: 'healeys at autox.team.net' <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

-----------------------------------------

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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