[Healeys] Overdrive problem

[Austin Healey]

Measure the pressure as per manual,

Gergo

2012/10/13 Michael Salter <michaelsalter at gmail.com>

> Hi Neil,
> Based upon my experience i would think that the oil type is not likely to
> be the real problem.
> You should check that the operating valve is opening all the way as per the
> workshop manual as that is very easy and can cause problems but again not
> the most likely cause.
> My bet would be that the pressure accumulator bore and piston are badly
> scored and allowing oil to pass. This can, with considerable effort be
> corrected without removing the gearbox.
> Wear and damage on other parts can contribute to the leakage but most of
> those, like the operating pistons require removal of the unit for repair.
>
> --
> Michael Salter
>
>                          *I have BJ8 water pump kits!!*
>
>
> On Sat, Oct 13, 2012 at 1:20 PM, Neil Blackshire
> <neilblackshire at gmail.com>wrote:
>
> > Hi Listers,
> >
> > I just got back from 2000 mile round trip in my 1960 3000, after about
> 1000
> > miles sometimes the overdrive would not stay engaged up hill, as journey
> > continued it gradually got worse until it would disengage straight away.
> I
> > was reading about possible causes and solutions and in the workshop
> manual
> > it says not to use extreme pressure oil,  I have been adding 75w80
> extreme
> > pressure oil to the gearbox since I have owned the car, 3 years (several
> > litres) and before leaving on the journey I used 80w90 by mistake. I know
> > that there are different views on which oil to use, but I thought to try
> > draining oil and replacing with 20w50 engine oil but manual says removing
> > filter drain plug  leaves about < pint in the overdrive. Could this small
> > amount of oil still be a problem? Or am I just wasting my time anyway as
> > the
> > problem is more likely to be the clutches or an oil pressure problem.
> >
> > Any comments please.
> > _______________________________________________
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