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Old 11-11-2010, 03:46 PM
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Can't "shove it on down into overdrive..."

Just got my 1950 all original Merc' running, with a 3 on the tree, only problem being that I am stuck out of overdrive...I am a bit confused by the fact that there seems to be three electrical wires running to the trans, and they are connected to what seems to be a relay and something larger than that...

Any idea what I am looking at? And/or if there is a way to make it "stick" in overdrive so I can get it 60 miles down the road to my mechanic with a lift?

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Old 11-11-2010, 09:21 PM
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Hi,
Wont the car move? You can drive the car 60 miles without putting it in overdrive. The other thing your looking at is a solenoid, you can run a hot wire to it & if it clicks it's working & you will probably have to trace the wires back from the solenoid to the switch, check the relay. I seam to remember a T handle mounted to the lower left side of the dashboard that you could manually engage & disengage the overdrive with. When we put the overdrives in later models (53s & 4s), we just ran wires from a toggle switch on the dash to the solenoid, because those cars weren't factory wired for overdrive.
Rich
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Old 11-11-2010, 09:26 PM
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The two electrical components on the trans are a solenoid, and the governor. If you connect the two governor wires to a toggle switch, it will bypass the governor. You can not bypass the solenoid. In addition there will be a relay on the firewall that these wires connect to, and other wires into the car, and to the coil. I would recommend a factory manual to trace wires and troubleshoot one of these.
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Old 11-11-2010, 09:37 PM
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Here's a wiring diagram.

http://www.vanpeltsales.com/FH_web/F...ing1949-54.jpg
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Old 11-11-2010, 10:19 PM
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how the o/d works

the governor powers the solenoid in the Mid 20's MPH, you have to let up on the gas pedal to let it shift up. when you push the pedal to the floor the kickdown switch cuts off the power to the solenoid and temporarily cuts off power to the ignition coil so the engine stops running for a second or two. This lets the spring on the solenoid retract and shifts out of overdrive. when you drive less than the governor speed setting in overdrive it cuts off power to the solenoid If you are going up a hill and the car does not coast the solenoid will not retract and you will still be locked in overdrive. When you are in overdrive you can not go backwards. This was called the hill hold feature. The pull out T handle is used to lock up the trans into regular 3 speed mode. This is usefull when pulling a trailer uphill and important when going down hill. If the handle is pushed in you can coast and not have any engine braking !!!. When you were cruzing and in overdrive secong gear and some one pulled along side and wanted to race you could stick your toe under the gas pedal and push down on the kick down switch to gear down before hitting the gas and opening all three carbs...When you wire in a toggle switch to operate the relay to power the solenoid you could shift it into overdrive in any gear and not have to be above the governot speed in first gear. Just like driving a big truck with a two speed rear end. Just remember you have to let up on the gas to let it shift up into overdrive and when you turn off the switch you also have to let up on the gas to let the spring retract the solenoid to shift out of overdrive. If you leave the switch on and are in overdrive you can not shift into reverse and you cannot roll backwards.
...PS.. I have a Packard all syncro OD trans in My steel body 15 T bucket, With the toggle switch. A Packard trans was the TREMEC of their day. The high school build over 50 years ago.
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Old 04-27-2011, 07:18 PM
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Thanks!

Thanks to all of you, I will be rolling to my first car show with overdrive this Friday!!
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Old 04-27-2011, 07:57 PM
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Hi
Glad you have it going. And thanks for replying. Will be looking for pictures of you receiving your first place award.
Good luck
Rich
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Old 04-28-2011, 03:53 PM
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well maybe not.

Okay, so I tried running a toggle bringing hot back to the solenoid but got no 'click'. So I'm guessing I have a bad solenoid. Any ideas hear guys?
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Old 04-28-2011, 04:01 PM
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Does it look like the one it the pic i posted ?


Cole
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Old 04-28-2011, 04:11 PM
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yes

exactly like that!
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Old 04-28-2011, 04:28 PM
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Have you checked ebay yet ? there are two guy's on there selling trans parts for your merc. I sent them both e-mails just to see if either one still had these parts.


Cole
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Old 04-28-2011, 04:30 PM
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Oh I am sure that I will be able to find them..Was just hoping someone might know of a part I could buy at an autostore than might work in its place
Thanks for your help and shoot me a line if you get a response back on ebay.
Ebay: zaorockabilly
email: tanberg@uni.edu
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Old 04-28-2011, 04:31 PM
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Quote:
Originally Posted by LuckyBoy
Oh I am sure that I will be able to find them..Was just hoping someone might know of a part I could buy at an autostore than might work in its place
Thanks for your help and shoot me a line if you get a response back on ebay.
Ebay: zaorockabilly
email: tanberg@uni.edu
I will get in touch if and when i hear back from them, i will send you a "PM" on here though ok.


Cole
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Old 04-28-2011, 04:53 PM
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Well one of them already got back to me and has already sold the one he had and don't have any more, One more left to contact me, I don't know of anything you can do to the one you have or of something different that might work but maybe someone else will see your thread and know something about it.


Cole
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Old 04-28-2011, 06:13 PM
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Hi
On the page the link takes you to at the bottom is a phone # for "Fifth Avenue Antique Auto Parts" They may be able to help you. Also on the page is a full wiring diagram for the OD & info about the solenoids.
Rich

http://www.hemmings.com/hmn/stories/...feature29.html

PS Why don't you try & open that solenoid & check the inside connections, it may just be corrosion.

Last edited by richard stewart 3rd; 04-28-2011 at 06:25 PM.
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