[TR] Overdrive issues

[Rye Livingston]

Yes they've been focused on the hydraulics, and they said all the components looked "pristine". They've swapped out pistons, seals, etc.  I've forwarded the emails from others to double check the solenoids as well.

Also, FYI, this symptom does it right off the bad when everything is cold, or after hours of driving and everything very warmed up.  In all ranges of temperature, it doesn't do it any more or less.  Very consistent symptom.
Rye

On Jun 11, 2016, at 03:07 AM, "hdrider570 at att.net" <hdrider570 at att.net> wrote:

When I had this problem with a J type OD, it was wear in the pump piston/bore.  This pump uses no seals so I expect that your mechanics are talking about the accumulator piston(s).  Basically when the piston/bore wears the clearances increase which allows oil to bypass the piston resulting in lower pressure.  One thing that I noticed was that the slippage was more pronounced once the OD warmed up thus reducing the viscosity of the oil.

I expect that a worn drive pin in the piston could cause a similar problem by shortening the piston sweep.

Bottom line is if you are not getting enough oil pressure, it is a hydraulic problem which is either not enough supply (pump wear?) or excessive losses somewhere such as bad piston seals etc.

Edward Hamer
Petaluma CA

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