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Thread: Overdrive

Forum to discuss Austin Healey Sports Cars

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    Overdrive

    My OD doesn't engage when I hit the switch but I know that it does work. While taking a test drive with the transmission tunnel off I hit the switch and nothing happened. Then with the switch still on I reached over to the little lever on the passenger side of the transmission and with a little push of my fingertip, it kicked in.Do you think a new switch and silanoid will fix her up?

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    Great Pumpkin Keoke's Avatar
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    Re: Overdrive



    -Nope you still need afactory manual which will tell you how to set up that little lever properly it is maladjusted.--Keoke----
    1966 Daimler V8 Saloon; Safely Fast, Built to Last & and; Smooth as Glass.
    1966 BJ8 [ 2 ] Lil Red & Miss bLU
    1985 XJ6 Saloon
    1948 & 70 Lincoln continentals
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    Re: Overdrive

    LOL You crack me up Keoke!! Is that going to require me to open up the guts of the trans&OD? If thats the case I don't think I'll ever have a working OD

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    Obi Wan Patrick67BJ8's Avatar
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    Re: Overdrive

    Quote Originally Posted by Donny_L
    My OD doesn't engage when I hit the switch but I know that it does work. While taking a test drive with the transmission tunnel off I hit the switch and nothing happened. Then with the switch still on I reached over to the little lever on the passenger side of the transmission and with a little push of my fingertip, it kicked in.Do you think a new switch and silanoid will fix her up?
    A very frequent problem and it is caused by a weak solenoid. You can hear it click but it won't move. I had a very similar problem and fixed it by installing a new solenoid. I did not measure the amp draw on bad versus new so I can't give you those figures.
    Patrick
    Patrick
    '67 Metallic Golden Beige/Red
    Owned since '72

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    Re: Overdrive

    If it's adjusted by tinkering with the switch under the hood, I've made that adjustment more than a dozen times,following the step by step instructions in the book. I'm pretty sure I got that right.

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    Re: Overdrive

    Speaking of overdrives, how does one insure that one never destroys his overdrive when backing up ?
    A wise man knows he knows not. Lao Tsu

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    Re: Overdrive

    No, Keoke is talking about the lever that the solenoid lifts up. It is accessible from the side cover (driver's side of the transmission). There is a procedure to adjust it.


    You could have a weak solenoid, but the adjustment is easy and free. Try that first and if it doesn't work, then replace the solenoid.

    The procedure is available from British Car Specialists. It also may be in your repair manual.
    Tim K.
    1960 3000 BN7 (owned since 1981)
    1973 Yamaha TX500 (Owned since new -- 11,000 lifetime miles)
    Former LBCís: 1961 TR3, 1966 MGB (SCCA race car)
    First car: Volvo 122S

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    Re: Overdrive

    Just make sure the shift lever switch is working (with the ignition on and the main OD switch on, you should hear the solenoid click when the shift lever is pushed to the right and "unclick" when the lever is returned to the center). The switch allows the OD to engage only when the shift lever is pushed to the right of neutral (away from 1st, 2nd, and reverse).
    Tim K.
    1960 3000 BN7 (owned since 1981)
    1973 Yamaha TX500 (Owned since new -- 11,000 lifetime miles)
    Former LBCís: 1961 TR3, 1966 MGB (SCCA race car)
    First car: Volvo 122S

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    Yoda
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    Re: Overdrive

    1) Design - there is a switch by the gear lever that only allows the O/D to be used in 3rd and 4th
    2) Technique - I always flip the O/D off when decelerating to a stop (else it will kick in when you may not want it when upshifting). If I forget, see #1

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    Re: Overdrive

    I read a thread in the Triumph section wherein the fellow claimed that due to wear internally sometimes the operating valve setting lever had to be set past it's normal 3/16 bar insertion placement. What do you think of that? Not that i am suggesting this for Donny.
    A wise man knows he knows not. Lao Tsu

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    Re: Overdrive





    Keoke-----------
    1966 Daimler V8 Saloon; Safely Fast, Built to Last & and; Smooth as Glass.
    1966 BJ8 [ 2 ] Lil Red & Miss bLU
    1985 XJ6 Saloon
    1948 & 70 Lincoln continentals
    1973 Volvo P1800ES

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    Re: Overdrive

    I'm not sure about that. I'd be cautious because the solenoid pull-rod has to travel all the way up to the top of the solenoid cylinder to turn off the high amp circuit that draws the pull-rod up, and activate the lower amp holding circuit. If it is misadjusted, it would quickly burn out the solenoid or blow a fuse.
    Tim K.
    1960 3000 BN7 (owned since 1981)
    1973 Yamaha TX500 (Owned since new -- 11,000 lifetime miles)
    Former LBCís: 1961 TR3, 1966 MGB (SCCA race car)
    First car: Volvo 122S

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    Yoda glemon's Avatar
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    Re: Overdrive

    It coul be a weak solenoid or out of adjustment operating lever, but since "I flipped the switch and nothing happened" with the trans cover off it also could be a bad switch or wiring problem, I woould check this before I start buynig parts, operate o/d with the engine off but iginition on, tunnel off, click into od in 4th, solenoid should at least try to click, make a little jump or noise, then shift into reverse and it should click again. If it doesn't something isn't getting juice or the solenoid isn't just weak, it is dead

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    Re: Overdrive

    I got your back, Keoke! [img]<<GRAEMLIN_URL>>/grin.gif[/img]
    Tim K.
    1960 3000 BN7 (owned since 1981)
    1973 Yamaha TX500 (Owned since new -- 11,000 lifetime miles)
    Former LBCís: 1961 TR3, 1966 MGB (SCCA race car)
    First car: Volvo 122S

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    Obi Wan
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    Re: Overdrive

    My switch musta been messed up when i destroyed mine. I replaced it and the solenoid when I slid a used replacement onto my tranny ." Slid " may not be the right term as I remember it involved compressing a number of springs only to find that the cam was in the wrong position and had to be realigned in order to bring the trans. and overdrive together. I have since seen a thin wire used to keep said cam in place. It worked fine when i was done after I reset the the operating valve and throttle switch. Thanx for the info. Bob, Elrey
    A wise man knows he knows not. Lao Tsu

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    Re: Overdrive

    I do hear the click when in the garage with the ignition on and engine off. On the road at speed I could not hear it because of all the nois. Especially with the trans tunnel off. By "nothing happened" I meant that it didn't drop the RPM untill I helped it out by moving that lever on the psngr side of the trans.

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    Jedi Knight TimK's Avatar
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    Re: Overdrive

    If you hear the click, you have electric power, so it is down to the lever travel which is controlled by the solenoid pull-rod travel and the adjustment of the left-side lever which is connected to the right side manual lever by a rod. A weak solenoid will click, but not pull all the way up; a misadjusted lever will not travel far enough to lift the ball valve to release the oil pressure in the accumulator to move the OD cone into place.
    Tim K.
    1960 3000 BN7 (owned since 1981)
    1973 Yamaha TX500 (Owned since new -- 11,000 lifetime miles)
    Former LBCís: 1961 TR3, 1966 MGB (SCCA race car)
    First car: Volvo 122S

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    Obi Wan RAC68's Avatar
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    Re: Overdrive

    Hi Donny,

    A couple of quick thoughts. Can we assume that the OD was working prior to your recent problem discover? Have you examined the solenoid to make sure it is dry (no oil fouling the piston) and that the rubber bumper is still in place below the piston?

    If you have recently changed the oil and used a synthetic (ie Red Line MTL), it is not unheard of for the oil to escape into, and flood, the solenoid chamber. This, of cause, would only be a problem if your OD has a cover plate sealing the solenoid compartment.

    Also, a small rubber piston bumper is fitted below the solenoid to stop the piston from extending further than the solenoid can retrieve. If for any reason this is not in place, the piston probably will not recover and the result could be a burned out solenoid.

    Good luck,
    Ray (64BJ8P1)

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    Re: Overdrive

    Can the solenoid get stuck in the ON position? Last question for awhile. Going back to watching and learning. Thanx, Elrey
    A wise man knows he knows not. Lao Tsu

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    Jedi Knight TimK's Avatar
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    Re: Overdrive

    There is a spring that pushes down on the ball valve that the solenoid lever lifts up. So the solenoid has to overcome spring pressure to go up. Spring pressure and gravity would tend to bring the solenoid pull-rod down when the electro-magnet circuit that holds the solenoid pull-rod up is turned off.
    Tim K.
    1960 3000 BN7 (owned since 1981)
    1973 Yamaha TX500 (Owned since new -- 11,000 lifetime miles)
    Former LBCís: 1961 TR3, 1966 MGB (SCCA race car)
    First car: Volvo 122S

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