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[Healeys] BN6 Overdrive

Subject: [Healeys] BN6 Overdrive
From: nmcd10 at gmail.com (Neil McDonald)
Date: Mon, 2 Jan 2017 18:56:57 +0000
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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