[Healeys] OD Good news Bad news

[Bob Spidell]

Either the pump, actuating pistons or the accumulator.  My guess would 
be the accumulator; mine still worked at 200K miles, but the cylinder 
was scored a little from the metal rings on the piston. The actuating 
pistons have rubber O-rings that wear so may not provide enough pressure 
to override the heavy springs that keep the OD a 'single shaft' when the 
it's not operating.  I believe the accumulator and pump can be replaced 
in situ, but I've not done it.  Or some combination of the three.  If 
you end up replacing the accumulator I recommend the DWM 'uprated' one 
if you like crisp activation.

Check: 1) pressure at the actuating valve port (should be over 400psi at 
speed, but I think it'll work as low as 350--not sure), 2) that the 
actuating shaft rises the correct distance--I believe it's 1/32"--when 
activated.  If you have good pressure that rules out the pump.  If you 
got the DWM accumulator, and it wasn't the problem, at least you'll have 
a crisper OD when after you tear into it to replace the O-rings.

I'm not surprised it disengages quickly; all the hydraulics are there to 
override the 8 heavy springs; the springs shouldn't fail (it's 
recommended to replace them if you do a complete rebuild, though I'm not 
convinced it's entirely necessary unless the OD was slipping when 
engaged; I think it's a 'might as well while it's on the bench' thing).

Bob

ps.  My stock accumulator still worked normally, and I kept it; if you 
want it I'll let it go for shipping cost.


On 6/29/2019 7:20 AM, Warren wrote:
>
> Recently had the OD quit working. First time in 52 yrs. Luck? Removed 
> tunnel and checked electrics and switches and solenoid seemed to work. 
> Some hesitancy with solenoid at first. Replaced solenoid and 
> interrupter switch as these were original parts and with close to 200K 
> on the car thought it prudent to do so. Tranny oil topped off 
> regularly and drained and cleanout of screen and magnets every two 
> years. Using Redline MT90 for many years. Before that used ND 30wt.
>
> Now I got it to go into OD. Every time. *_The good news_*_._ But it 
> takes a loooong time. Many seconds. Just flip the switch at speed and 
> “eventually” it slowly slides into OD. Not crisp and instant like 
> before.*_The bad news_*. It disengages normally as before. Flip, 
> depress clutch slightly, blip accelerator.
>
> I’ve researched the archives as much as possible on all the forums but 
> am hesitant to proceed without forum\list wisdom.
>
> WD     67 BJ8
>
>
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