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[Healeys] BN6 Overdrive

Subject: [Healeys] BN6 Overdrive
From: rick at ewilkins.com (Rick Wilkins)
Date: Tue, 3 Jan 2017 08:48:07 -0800
References: <B3AAE6AF-5302-4A44-BFB1-9EDE5A94B072@gmail.com> <e9fb9dfb-72e9-0636-62cd-755231f83708@comcast.net> <DM3PR19MB056992512147329E4597D7EDA56F0@DM3PR19MB0569.namprd19.prod.outlook.com> <C63390C0-55C3-4289-9AFA-DA3AF926358F@gmail.com> <749F94B05E660FF2.07577162-f9ce-43fe-b0bc-96d17c26096a@mail.outlook.com> <93717BF2-8D4E-4526-A79D-DA71ED00FB19@gmail.com>
I've found that one of the simplest, and easiest to miss is the starting point 
of the actuating lever. Make sure it has a rubber rest attached to the flange. 
If that lever is too low from start, it will always be hard to engage.

Wilko

On Jan 3, 2017, at 7:02 AM, Neil McDonald wrote:

> Wonderful feedback. Thanks everyone. 
> 
> I have concluded that the most likely cause of my problems are low OD fluid 
> levels and/or inadequate opening of the actuating valve. Both I can  readily 
> deal with. 
> 
> Right now I am five thousand miles away from my Healey so it will be a couple 
> of months before I can confirm a fix.  
> _____________________
> Neil McDonald
> 
> Email: nmcd10 at gmail.com
> 
> Sent from my IPhone 
> 
> On Jan 3, 2017, at 2:03 PM, michael.salter at gmail.com wrote:
> 
>> Yes Neil, David is referring to the pump non return valve however if you are 
>> able to confirm that you have 390 p.s.i. in the overdrive that valve is not 
>> in need of checking. 
>> Michael S 
>> BN1 #174
>> 
>> Correct diagnosis is half of the repair.
>> 
>> 
>> 
>> On Mon, Jan 2, 2017 at 9:02 PM -0500, "Neil McDonald" <nmcd10 at gmail.com> 
>> wrote:
>> 
>> By referencing the check valve on the side of the pump, David Nock has taken 
>> me into new and uncharted territory! 
>> 
>> I assume this valve is totally different from the ball lifted by the OD 
>> actuating lever? The mystery deepens with the reference to multiple balls 
>> and the need to ensure that they are in the right way.
>> 
>> More help on this please.
>> _____________________
>> Neil McDonald
>> 
>> Email: nmcd10 at gmail.com
>> 
>> 
>> On 2 Jan 2017, at 23:31, WILLIAM B LAWRENCE <YNOTINK at msn.com> wrote:
>> 
>>> If the OD engages when cold, but disengages when it warms up your problem 
>>> could be with leakage through the o-rings that seal the accumulator body to 
>>> the housing. It's an easy fix, but removing the accumulator body is 
>>> somewhat of a trick. I was advised to remove the side plate and the 
>>> accumulator springs, place a dowel in the center of the accumulator piston 
>>> to keep it from moving and apply air pressure through the actuator valve 
>>> hole (after removing the valve and ball). The accumulator body is the large 
>>> sleeve in which the accumulator piston resides.
>>> 
>>> 
>>> Bill Lawrence
>>> 
>>> From: Healeys <healeys-bounces at autox.team.net> on behalf of Bob Spidell 
>>> <bspidell at comcast.net>
>>> Sent: Monday, January 2, 2017 9:11:48 PM
>>> To: healeys at autox.team.net
>>> Subject: Re: [Healeys] BN6 Overdrive
>>>  
>>> The OD and gearbox share fluid supply.  Take the car out for a run to 
>>> get the fluid warmed-up, then get it up on a rack--preferably--or SAFELY 
>>> on jackstands, as high as they'll go. There is a dipstick on top of the 
>>> gearbox; check your fluid level before emptying--if it's low that could 
>>> be at least part of your problem.  There is a drain plug on the bottom 
>>> left side of the gearbox, and a big brass disk on the OD.  Older cars 
>>> had a sensible square 'nut' on the OD plug, which can be turned with a 
>>> big crescent wrench, and newer ones have a notched disk that requires a 
>>> tool to be undone properly, but you can use a brass punch and hammer or 
>>> other method.  When you drop the brass plug, there should be a 
>>> cup-shaped screen and, possibly, a couple of soft, circular magnets.
>>> 
>>> Let the fluid drain completely, then re-install the gearbox and OD 
>>> plugs, being sure to a) place the magnets inside the plug and b) place 
>>> the screen on top of the magnets.  It's difficult to stop leakage from 
>>> the OD plug; use a new fiber washer and, possibly, some teflon tape on 
>>> the threads of the plug (being careful to not get any inside the OD).  
>>> Top off with the fluid of your choice--'book' is 30W non-detergent, but 
>>> most motor (20W-50) and synthetic gearbox oils work well--checking the 
>>> level often with the dipstick.  Should take about 3.75 quarts.
>>> 
>>> Don't know how you 'persuaded myself that the OD electrics are fine,' 
>>> but my money's on the electrics--esp. the relay.
>>> 
>>> Bob
>>> 
>>> 
>>> On 1/2/2017 10:56 AM, Neil McDonald wrote:
>>> > One of my New Years resolutions, before I put the car back on the road 
>>> > after sitting in the garage for several years, is to fix the overdrive so 
>>> > the car is comfortable highway driving. It once (and once only) went into 
>>> > OD once very briefly - which suggests that nothing mechanical is broken.
>>> >
>>> > So far I have persuaded myself that the OD electrics are fine and there 
>>> > is adequate hydraulic pressure - around 390 psi if I recall correctly. I 
>>> > have also checked the hydraulic valve adjustment using the "drill through 
>>> > the actuating lever" method but not the direct "is the valve ball lifting 
>>> > by at least 1/32 inch when the solenoid is actuated?" method.
>>> >
>>> > Somewhere I read that there is a small passage around the hydraulic valve 
>>> > area which can get blocked and thus needs cleaning out with a wire. Is 
>>> > there an internet link elaborating on this?
>>> >
>>> > Online research also suggests that I should change out the OD fluid which 
>>> > is certainly old and a significant amount could have leaked out. I assume 
>>> > that the gear box has a drain and filler plug but have yet to find them. 
>>> > Should I refill to just short of overflowing or ......?
>>> >
>>> > I don't have the resources to pull and strip the OD myself so am hoping 
>>> > that I can get it working without hiring a professional. Does anyone have 
>>> > any words of wisdom and/or comfort?
>>> > _____________________
>>> > Neil McDonald
>>> >
>>> > Email: nmcd10 at gmail.com
>>> >
>>> >
>>> >
>>> 
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