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[Healeys] BN6 Overdrive

Subject: [Healeys] BN6 Overdrive
From: healeydoc at sbcglobal.net (David Nock BCS)
Date: Mon, 2 Jan 2017 16:10:21 -0800
References: <B3AAE6AF-5302-4A44-BFB1-9EDE5A94B072@gmail.com> <e9fb9dfb-72e9-0636-62cd-755231f83708@comcast.net> <CA49A3E1-47DB-4A3A-84F1-41C006072264@gmail.com>
The oil bypass in the operating rod will not cause you this problem. If it 
is plugged the overdrive will be slow to disengage. Like Mike said the most 
likely problem is the adjustment of the solenoid. You probably are not 
raising the check ball on the operating rod the correct 1/32 or .0312.
If the ball is not raised correctly insufficent oil will be sent into the 
system and the overdrive will be slow to engage.

The next place that could cause the problem is if the seat for the check 
valve on the side of the pump is bad you will be slow to build pressure and 
when you operate the overdrive the system will be slow to recover the 
pressure.

ALso check that the check balls are in there correct location. It is easy to 
switch the check balls.



David Nock
British Car Specialists
209-948-8767
www.britishcarspecialists.com
-----Original Message----- 
From: Neil McDonald
Sent: Monday, January 02, 2017 3:08 PM
To: Bob Spidell
Cc: healeys at autox.team.net
Subject: Re: [Healeys] BN6 Overdrive

Thanks for the replies so far. Pleased that nobody yet is suggesting OD 
internal mechanical problems. What about cleaning out the mysterious oil 
passage that might be blocked?

I concluded that electrics are OK because the solenoid is brand new and 
moves and holds the hydraulic valve actuating lever when called upon.
_____________________
Neil McDonald

Email: nmcd10 at gmail.com


> On 2 Jan 2017, at 21:11, Bob Spidell <bspidell at comcast.net> wrote:
>
> 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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