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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