Register now to get rid of these ads!

Technical Fried distributor y block

Discussion in 'The Hokey Ass Message Board' started by Coopertough, Feb 21, 2018.

  1. Coopertough
    Joined: Jun 11, 2016
    Posts: 35

    Coopertough
    Member

    Any insight on why my wire melted from coil to dist.? Heres the background so blew the motor in my 64 f250 (292 y block) tracked down new motor came from 58 or 59 ford car possibly fairlane or country squire swapped my parts over to make it mountable in the truck (oil pan and pickup tube timing cover and water pump exhaust manifolds alternator brackets((gm one wire)) intake manifold) using all my parts on the new motor like coil and starter and solenoid new cap rotor plugs wires after everything was hooked up I dropped in a battery and went to crank it after about 10 seconds of cranking I noticed some smoke got out to check and noticed I'd melted a wire so I'm wondering does anyone have any idea what would have caused it? From my searching there's no real difference in the distributors and all my wiring is exactly the same as when I pulled the old motor hell most of the parts are the same ones could it be a bad ground from the block? I still have my old distributor from the 64 block but would like to figure out any issue before swapping it in and melting it too. Thanks in advance -Mike.
     
  2. squirrel
    Joined: Sep 23, 2004
    Posts: 52,797

    squirrel
    Member

    the time I did that was when I hot wired an engine to start it, and accidentally clipped the hot wire on the negative coil terminal (which goes to the points), instead of the positive terminal.

    But we'd probably need to know more about the wiring in the car to be able to help you figure it out.
     
  3. PM GMC_BUBBA, he is the Dizzy Master.... :)
     
    Coopertough likes this.
  4. Coopertough
    Joined: Jun 11, 2016
    Posts: 35

    Coopertough
    Member

    Ill take some pictures this afternoon and post them so you can see what I have going on .
     

  5. Got points ? Probably lack of a ballist resistor ?

    Oldmics
     
    Coopertough likes this.
  6. Coopertough
    Joined: Jun 11, 2016
    Posts: 35

    Coopertough
    Member

    Its still points maybe ill go buy an internal ballast coil for the 58 fairlane I believe my old one was external. I was assuming it was somehow voltage related as I know too high or too low voltage will melt a points eliminator
     
  7. External ballist is kosher to use.
    Just make sure that the "run" voltage is filtered thru it to reduce the current.

    Oldmics
     
    Coopertough likes this.
  8. squirrel
    Joined: Sep 23, 2004
    Posts: 52,797

    squirrel
    Member

    Still should not fry the wire.
     
    olscrounger and sunbeam like this.
  9. The ballast resistor should be bypassed when the ignition switch is in the crank position.
     
  10. Yeah, it will .Ask me how I know !

    Also check that the internals on the fried distributor were wired correctly.

    Oldmics
     
  11. squirrel
    Joined: Sep 23, 2004
    Posts: 52,797

    squirrel
    Member

    I guess it might depend on the coil, and how thick the wire is.
     
  12. Truck64
    Joined: Oct 18, 2015
    Posts: 5,325

    Truck64
    Member
    from Ioway

    That was my thought as well.

    Measure the primary winding resistance (ohms) - between the coil terminals, if you don't know what it is offhand.

    Report back what it is.
     
    Coopertough likes this.
  13. I've had the wire short out where it passes thru the distributor body. It didn't melt; but found it was getting pretty hot while checking for loss of spark on the side of road.
     
  14. squirrel
    Joined: Sep 23, 2004
    Posts: 52,797

    squirrel
    Member

    That's the thing, the wire will let a certain amount of current go through it, and not get hot enough to melt the insulation. The amount of current it sees is limited by the resistance of the coil, and the ballast resistor (if there is one). Ohm's law will let you figure out the current, based on voltage and resistance. There are tables where you can look up the current capacity of different wire sizes, which is usually based on the temperature that the insulation is allowed to get up to.

    It's all pretty complicated, if you're an engineer.
     
    Truckdoctor Andy likes this.
  15. I was going to say the same thing. Many years ago I was hot wiring a car and clipped the jumper to the neg side of the coil. Let the smoke out I did.

    I guess a careful look over is warranted.
     
  16. Coopertough
    Joined: Jun 11, 2016
    Posts: 35

    Coopertough
    Member

    So here's a few pics the ones out of the motor are of the 58/9 that was in that fried the last pic of the one in the motor are of my original 64 I went ahead and swapped it in already the difference being the single wire instead of a jumper wire looking at it out of the truck it appears to be a later style or a replacent only a guess bybthe stamping saying motorcraft instead of ford so I'm gonna wire up my 64 with a new coil I had in the glove box
     

    Attached Files:

  17. squirrel
    Joined: Sep 23, 2004
    Posts: 52,797

    squirrel
    Member

    hard to tell how the coil was wired, from your pics...

    The tag says C5... which means 1965 or later.
     
    Coopertough likes this.
  18. sunbeam
    Joined: Oct 22, 2010
    Posts: 5,899

    sunbeam
    Member

    It got to be the coil even a dead short in the distributor would not fry the wire closed points are a dead short. The only other choice is way more than 12v going to the coil.
     
  19. greybeard360
    Joined: Feb 28, 2008
    Posts: 2,021

    greybeard360
    Member

    Look at the wire on the condensor. It may be shorted to the distributor body.

    Yes, that would fry the wire if any of them are going to dead short. If the points are closed with key on and not running... Can do it too.

    Sent from my Moto G Play using The H.A.M.B. mobile app
     
    Coopertough likes this.
  20. Coopertough
    Joined: Jun 11, 2016
    Posts: 35

    Coopertough
    Member

    Well not too sure what it was but with the 64 dist. And new coil it fired I just have to adjust timing. My only guess is it had something to do with that bridge wire on the 58/9 (decoded as 65-or later) dist. I pulled but here's a pic of how its all wired .
     

    Attached Files:

  21. Coopertough
    Joined: Jun 11, 2016
    Posts: 35

    Coopertough
    Member

    From what I've looked at on the problem dist. Is a little bit of surface rust on the condenser and a crack in the ground so possibly a combination of little things caused it to short
     
  22. Coopertough
    Joined: Jun 11, 2016
    Posts: 35

    Coopertough
    Member

    That was my original thought that maybe it was an earlier one and possibly only 6 volt but as someone else pointed out its a 65 or later dist.
     
  23. sunbeam
    Joined: Oct 22, 2010
    Posts: 5,899

    sunbeam
    Member

    Question 1- 65 or later Y block?? question 2 what does the green wire in the picture go to Tach?
     
  24. I'm with Sunbeam, last year for the Y block was 64, and those distributors do not fit anything else.
     
  25. Truck64
    Joined: Oct 18, 2015
    Posts: 5,325

    Truck64
    Member
    from Ioway

    64 was the last year for Y Blocks, at least domestically.
     
    squirrel likes this.
  26. brigrat
    Joined: Nov 9, 2007
    Posts: 5,527

    brigrat
    Member
    from Wa.St.

    Check engine ground........................................................
     
    Coopertough likes this.
  27. Coopertough
    Joined: Jun 11, 2016
    Posts: 35

    Coopertough
    Member

    64 last year and yes tach is green wire .
     
  28. Coopertough
    Joined: Jun 11, 2016
    Posts: 35

    Coopertough
    Member

    So my truck is 64 the motor date stamps 58 the distributor another member mentioned to be 65 or later and another had mentioned something like up to 78? Body's were the same but different length shaft but ive got the 64 dist. In it now and got it to fire still would like to determine what the issue might have been for future references but as mentioned above a short in the dist. Was the likely cause .
     
  29. The C5 could designate a service replacement....
     
    Coopertough likes this.
  30. squirrel
    Joined: Sep 23, 2004
    Posts: 52,797

    squirrel
    Member

    Yes, it could.
     

Share This Page

Register now to get rid of these ads!

Archive

Copyright © 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.