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[Healeys] BN6 Overdrive

Subject: [Healeys] BN6 Overdrive
From: 050.rpl at gmail.com (R. Lindsay)
Date: Mon, 2 Jan 2017 18:57:35 -0500
References: <B3AAE6AF-5302-4A44-BFB1-9EDE5A94B072@gmail.com> <e9fb9dfb-72e9-0636-62cd-755231f83708@comcast.net> <CA49A3E1-47DB-4A3A-84F1-41C006072264@gmail.com>
I have had this issue.  Looked at electrics and all OK. I cleaned out the 
passage/ ball valve and the OD has worked fine for 25+ years. 

Price Lindsay

Cell: 630-841-6300
Email: 050.rpl at gmail.com

Sent from my iPhone

> On Jan 2, 2017, at 6:08 PM, Neil McDonald <nmcd10 at gmail.com> wrote:
> 
> 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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