[Healeys] BN6 Overdrive

[J. Scott Morris]

Good Day Neil and welcome to 2017The attached OD Trouble Shooting Flow Chart may be of some help in figuring out what the problem is.Good Luck 
--Scott Morris; Simcoe, Ontario, Canada - Keep Smiling, Murphy Lives 

    On Monday, January 2, 2017 3:34 PM, Neil McDonald <nmcd10 at gmail.com> 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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