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Weird overdrive issue 120-130

posted by  robsvolvos on  Sun May 5 21:50 CST 2019
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last visit: Tue Aug 5 19:55 CST 2014
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Hi guys,
I'm having weird issues with my overdrive. It will engage and disengage sporadically with no switch input, and in all gears! Here's the weird part- after isolating all cables and testing the fourth gear switch(everything tested 100 %), I disconnected the wire from the solenoid altogether and had the same problem! How is this even possible? I didn't think you could have overdrive functional without electrical power. Any thoughts?
Thanks!

Rob








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    Weird overdrive issue 120-130

    posted by  Ron Kwas on  Mon May 6 05:33 CST 2019
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    last visit: Fri Oct 24 04:03 CST 2014
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    Rob;

    All the electrical parts and circuits controlling the OD are just for the convenience of controlling the activation lever with a simple switch on the dash...so if you disconnect all of the elec control stuff and it still self-activates, the issue is clearly within the OD itself...I'd start by opening the cover plate to access the activation lever (I'm presuming a "D" Type here), and inspecting conditions of the Sol to Act Lever connection, as well as unactivated Lever position. It should be positioned away from Sol, and have preload keeping it there...if it has no preload, I don't think this can be repaired from the outside, but OD must be removed for internal repairs of the control valving...I'd refer to an internal exploded assembly diagram next...

    Good Hunting!








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      Weird overdrive issue 120-130

      posted by  robsvolvos on  Mon May 6 21:08 CST 2019
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      last visit: Tue Aug 5 19:55 CST 2014
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      Thanks, guys. Sorry, I should have specified- it's a J-type from a 140. Nice to learn to that I'm not losing my mind and that it is possible to have activation with electrical. I just got this car and haven't checked the fluid yet. Could a low level or the wrong type of oil cause this? The tranny is quite wet, so it's possible it's down.
      Thanks!
      Rob








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        Weird overdrive issue 120-130

        uid 5322's pic
        posted by  alschnertz on  Tue May 7 00:51 CST 2019
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        last visit: Fri Oct 24 10:32 CST 2014
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        Going back a few years since I rebuilt my D and J-type overdrives, but if i recall, the OD pump is making pressure whenever the gearbox output shaft is turning.
        When you activate the solenoid, that pressure is bypassed through a valve and the overdrive is engaged.

        The scary part of your situation is that even with the vehicle moving in reverse, the pump will still make pressure.
        And you DON'T want the OD to engage in reverse, period! It will destroy a gear inside the OD that is intended to only move in a forward direction.

        My suspicion is that the seals are gone on the valve.
        Pretty sure you can access the valve and seals by removing the plate on the bottom of the gearbox, though you may need a special tool to remove a couple plugs.







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          Weird overdrive issue 120-130

          posted by  derek uk on  Tue May 7 03:56 CST 2019
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          last visit: Fri Oct 24 12:33 CST 2014
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          I'd straight away think low oil level. As the car is new to you, might as well check and then change it out for fresh 20-50.








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            Weird overdrive issue 120-130

            posted by  Ron Kwas on  Tue May 7 06:41 CST 2019
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            last visit: Fri Oct 24 04:03 CST 2014
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            Rob;

            Assuring the oil level is right certainly cant hurt...and Al has given good info also...when the shaft is turning, so is the eccentric on it, therefore generating hydraulic pressure, and if OD likes to self-engage, there's a chance that it might do this when in reverse...deadly to the OD...you should check and understand/sort this issue ASAP.

            Cheers








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    Weird overdrive issue 120-130

    posted by  planetman on  Sun May 5 22:41 CST 2019
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    last visit: Fri Oct 24 09:29 CST 2014
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    Which overdrive, D or J?
    --
    Eric
    Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
    Torrance, CA 90502
    hiperformanceautoservice.com or oldvolvosonly.com







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