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Freeze plug

Discussion in 'Flat Fender Tech' started by Chuck, Jun 8, 2005.

  1. Chuck

    Chuck Sponsor

    Ha, Flattie Tech! Ok, let me jump into the water first.

    Would anyone know what size the freeze plugs are in a L-head. If not I can measure it with a caliper gauge. Can’t find the one that popped out. Thanks.
     
    Chuck, Jun 8, 2005
    #1
  2. w3srl

    w3srl All-around swell dude Staff Member

    Stand by, checking the FSM now....
     
    w3srl, Jun 8, 2005
    #2
  3. w3srl

    w3srl All-around swell dude Staff Member

    Sorry Chuck, the FSM doesn't say. I do know that not everyone stocks the flat-style plugs since they're essentially obsolete nowadays. If NAPA can't get them, I'd call Walck's. BTW- Replace them all. if one went, the others aren't far behind. ;)

    You know how the flat-type plugs install, right?
     
    w3srl, Jun 8, 2005
    #3
  4. jpflat2a

    jpflat2a what's that noise?

    parts manual says 1-1/4" diameter
    they're never wrong :rofl:
     
    jpflat2a, Jun 8, 2005
    #4
  5. Chuck

    Chuck Sponsor

    Thanks Steve for checking. I have always installed others with a dowel, is there a special technique with the flat style?

    Thanks Jim for the info. :beer:
     
    Chuck, Jun 8, 2005
    #5
  6. w3srl

    w3srl All-around swell dude Staff Member

    Yeah, slightly different. The cup-type plugs drive in with a large dowel as you mentioned; The flat-type plugs are actually dished a bit. You want to install them with the dished part rounded OUTWARD, and the plug will just about drop into the boss in the block. Then you center you big dowel (about 1" or better) on the plug and give it a coupla taps with a mallet to flatten it out slightly, which makes it seal in the block. Oh, and I always use a bit of the old-style Permatex sealer on them too. Better safe than sorry! ;)
     
    w3srl, Jun 8, 2005
    #6
  7. jpflat2a

    jpflat2a what's that noise?

    Permatex High Tac (k) I believe
    good stuff, purple and sticky
     
    jpflat2a, Jun 8, 2005
    #7
  8. Chuck

    Chuck Sponsor

    Good heads up Steve, I’m glad you asked thank you. :beer:
     
    Chuck, Jun 8, 2005
    #8
  9. speedbuggy

    speedbuggy Looking for a Jeep now

    I learned something new today...

    Definately worth reading ;)
     
    speedbuggy, Jun 8, 2005
    #9
  10. nickmil

    nickmil In mothballs.

    Those kind of plugs are called either welsh or welch plugs, don't remember which :oops: . I like using a little Permatex Aviation Form-a-gasket on them. Works great. Make sure you lightly sand the inside of the boss to clean up and give a good sealing surface. Nickmil.
     
    nickmil, Jun 8, 2005
    #10
  11. m38willys

    m38willys Jeep Vice 2024 Sponsor

    welch plugs IIRC Nick
     
    m38willys, Jun 8, 2005
    #11