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EFV-8 Club Forum / General Ford Discussion / overdrive solenoid

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Discussion Topic: overdrive solenoid -- page: 1 2

tomlud

07-18-2017 @ 3:01 PM

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I have a 51 ford custom deluxe tudor v8 with 3 on the tree and overdrive. after several miles usually 50 or more, sometimes 150+ the overdrive will disengage and I find my self freewheeling. when I put in a new 30 amp fuse the overdrive works again, ( only after system has cooled down). Thinking that I have an electrical issue I had an auto electric specialist look at it. He examined and tested all the wiring and can find no fault. I should mention that when I drove it to him and then he test drove it the OD works fine. I'm not a mechanic but assume that I may have a bad solenoid and that when it heats up it goes out. Assuming I do need to replace the solenoid can anyone tell me the correct shaft length for my car without having to remove the one on the car and where to buy one. I'd appreciate any and all thoughts on this. Thanks. Tom

JT Ford

07-19-2017 @ 8:05 AM

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I' pretty sure the '49, '50 and '51 are the same. The convertible is different than the sedans. www. fifthaveinternetgarage.com sells new ones. About $265. in the 2014 catalog. They show that the shaft is 1 inch long for your car.

supereal

07-19-2017 @ 2:02 PM

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The problem is likely the "hold" set of points in the solenoid. There are two sets under the end cap, one to energize the solenoid to engage the overdrive, and the other to hold it engaged until the power is off. This reduces the amount of current needed to pull the solenoid, and lets the "hold" points keep it engaged. Either the "pull" points are stuck together, or the "hold" set is dirty or burned. At our shop we see this when a 6 volt car is converted to 12 volts. As for the difference between the open and closed cars, it is in the "elbow" adapted that lets the solenoid clear the "X" brace on the frame. The rest is the same.

tomlud

07-19-2017 @ 4:07 PM

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if any of the points are "burned" can they be cleaned and can the solenoid likely be salvaged or does it need to be replaced? The car is still a 6 volt system.

sarahcecelia

07-19-2017 @ 7:54 PM

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"Everything on the overdrive system will work with 6 or 12 volts, with the exception of the solenoid. It will work on 12 volts for a short time, but then it will go bad.You have to buy a 12 volt solenoid if you convert to 12 volts." per, Randy Rundle, Fifth Garage, Clay Center, Kansas City, Kansas.

Regards, Steve Lee

This message was edited by sarahcecelia on 7-19-17 @ 8:03 PM

sarahcecelia

07-19-2017 @ 8:08 PM

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Randy Rundle sells a booklet, at a nominal cost, telling you everthing you need to know about overdrive and how it works, trouble shooting it, and drawings of the wireing. With that booklet, you can fix it yourself.

Regards, Steve Lee

sarahcecelia

07-20-2017 @ 6:36 AM

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You can test the solenod by running a "hot" jumper wire to the terminal that is closest to the end cap. Just "strike it" on the terminal. You should hear the solenoid "jump." You can also test it out of the car. Just ground it and touch a hot wire to that terminal. You can clean the points with a small piece of 400 sandpaper, or something close to that like 320. After cleaning them , pull a paper business card between the contacts to take off any residue. If you need to take the solenoid out , you have to turn it about 1/4 turn to the right to remove it. Putting it back in you have to engage the pawl on it into the trans, and turn it 1/4 turn to the left. If it is in properly, before you put the two bolts back in, you should be able to pull on it and feel a sprng tension. All of this is explained in Randy Rundles O'drive booklet. You should really get one before you damage something by not knowing what your doing! Call him @785-632-3450. keep trying he's very busy!

Regards, Steve Lee

39 Ken

07-21-2017 @ 3:23 AM

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The original Borg Warner overdrive manual is on line
thanks to the Studebaker Club in Ga.

http://www.studebakerclubs.com/NorthGeorgia/Overdrive.pdf

tomlud

07-21-2017 @ 11:24 AM

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Thanks to all of you who responded. I'm in the process of moving to SW Fla so hopefully when I get settled their the local regional chapter can assist me in finding a good mechanic. Thanks again. Tom.

sarahcecelia

07-21-2017 @ 4:24 PM

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Your right all of those solenoids for sedans and convertibles are the same.The convertible had a special Ell brackett, to make it clear the x frame but stll used the same solenoid.

Regards, Steve Lee

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