Advice - Broken Radiator Drain Cock

Discussion in '40- & 55-Series Tech' started by MTBer, Nov 10, 2018 at 6:25 PM.

  1. MTBer

    MTBer

    Messages:
    9
    Likes Received:
    5
    Joined:
    Sep 25, 2018
    Location:
    San Diego
    I was feeling risky today and it didn't turn out well...I was hoping to get the radiator drain cock unstuck on my '74 FJ40 and managed to snap it right off the drain tube. If anyone has any advice on ways to go about fixing it I'd sure appreciate it.

    I see that the drain tube is threaded into the bottom of the radiator with what looks like maybe a pipe thread. I'm very afraid of trying to unscrew it since I'm pretty sure I'll either destroy the radiator or mangle the drain tube. All I can think of is trying to braze a machined fitting to it that allows me attach an off the shelf drain cock. I'd sure like to find an easier solution.
    petcock.JPG
    Thanks.
     
    RAGINGMATT likes this.
  2. bikersmurf

    bikersmurf

    Messages:
    8,528
    Media:
    60
    Albums:
    4
    Likes Received:
    1,852
    Joined:
    Apr 2, 2008
    Location:
    Victoria, BC
    Heat and then ice the tube a few time aply penetrating oil and let it sit overnight. It should come easily if you go slow.
     
  3. RAGINGMATT

    RAGINGMATT Factory Focus-Point Mind-Set Approch..... Supporting Vendor

    Messages:
    3,860
    Media:
    21
    Likes Received:
    2,332
    Joined:
    Aug 12, 2007
    Location:
    East Coast
    I offer J.I.S. Radiator Drain tube & Engine Block Drain pet-cock Kits

    I make Hand make these myself to Japanese Industrial Standards pipe thread pitch and diameter

    Made from Thick RED brass that will not Rust , has stainless steel petcock twist

    I designed the Radiator tube drain specifically with the 40 series Cross-Member access in

    mind ,

    the engine block petcock has a Thick Solid Brass Twist


    & Follow @bikersmurf 's suggestion for removal of your old broken steel tube , he's spot on




    DSCN9876.JPG
     
    Last edited: Nov 10, 2018 at 10:41 PM
    numby, allan man, Bear and 6 others like this.
  4. 65swb45

    65swb45 Elder Statesman Supporting Vendor

    Messages:
    23,849
    Likes Received:
    8,625
    Joined:
    Apr 14, 2004
    Location:
    818-953-9230
    Get some heat on the pipe, pull it out of the radiator, and put one of @RAGINGMATT setups in...

    ...unless your radiator is as old as I think it is, in which case I recommend you just order a new radiator from @beno or another vendor that supports MUD.
     
  5. MTBer

    MTBer

    Messages:
    9
    Likes Received:
    5
    Joined:
    Sep 25, 2018
    Location:
    San Diego
    Thanks guys. I just had to go grab some more PB Blast and will give it a shot with the hot and cold right now. A new radiator would be great but want to try this first and see if I have the option to just repair it.
     
  6. RAGINGMATT

    RAGINGMATT Factory Focus-Point Mind-Set Approch..... Supporting Vendor

    Messages:
    3,860
    Media:
    21
    Likes Received:
    2,332
    Joined:
    Aug 12, 2007
    Location:
    East Coast

    Make sure u place the plumbers pipe wrench near the base of the Radiator , NOT out towards the Tip of the broken tube , this will give u a

    Positive Straight , Plumb-Level-Square turn .

    if u go at it at the end Tip , the tube will bend sideways
     
  7. emac

    emac

    Messages:
    1,451
    Media:
    3
    Albums:
    1
    Likes Received:
    1,138
    Joined:
    Aug 28, 2015
    Location:
    SC
    heat and kroil oil!
     
  8. Steamer

    Steamer SILVER Star

    Messages:
    619
    Likes Received:
    198
    Joined:
    Jul 20, 2009
    Location:
    Miami, FL
    If you bugger it up trying and the radiator's in decent shape, a radiator shop can solder in a new bung for far less than a new radiator.
     
  9. Coastline

    Coastline

    Messages:
    601
    Likes Received:
    74
    Joined:
    Sep 25, 2009
    Location:
    Cucamonga but don't want to be.
    I can not understand why you guys try to save a couple bucks on a relic part. I second what Mark said. Buy a new radiator, they are cheap. Especially so compared to the the most likely outcome. Case in point: A couple weeks ago a guy was questioning whether an old oil pump would be good enough for his rebuilt 2F motor. No. No and no.
     
    Martyt and emac like this.
  10. emac

    emac

    Messages:
    1,451
    Media:
    3
    Albums:
    1
    Likes Received:
    1,138
    Joined:
    Aug 28, 2015
    Location:
    SC
    The engine builder who has done several motors for me will not even consider building a motor without a new oil pump! In my 40 I bought a new oem rad (comes with a new cap) on my 62 I took it to a shop and had it cleaned and fixed.
     
  11. numby

    numby

    Messages:
    825
    Likes Received:
    29
    Joined:
    May 3, 2009
    I was going to do this on my Cruiser after it worked out well on another vehicle (cough-Jeep-cough) but then the little T shaped piece of metal twisted free and now just spins. This would be problematic on Cruisers where the radiator is recessed up into the core support. There would be no way of getting a pair of pliers up in there if I needed to drain the radiator in a sensitive environment. I have an aftermarket radiator with what I assume is a standard pipe thread fitting and a plastic plug which has stripped out more than once. Factory drain plug components don't seem to fit so I need to address this too.
     
  12. SteveH

    SteveH

    Messages:
    3,875
    Likes Received:
    1,206
    Joined:
    Jan 17, 2005
    Location:
    Southern Colorado
    Some brand new FJ40 radiators come with a crappy, recessed nylon wing nut (not on a long stalk that protrudes through the core support) that its impossible to reach, but if you do remove it, will spray coolant all over creation when you drain the radiator. You'd have fab on the extended drain tube anyway.

    I would properly fix the old radiator if it otherwise is sound and the truck is not overheating.
     
  13. 65swb45

    65swb45 Elder Statesman Supporting Vendor

    Messages:
    23,849
    Likes Received:
    8,625
    Joined:
    Apr 14, 2004
    Location:
    818-953-9230
    You can actually tell from the fins on the OPs radiator that is an original 40+ year old unit. I’ve been pulling radiators out of 40s for four decades, so I should know.
     
  14. RAGINGMATT

    RAGINGMATT Factory Focus-Point Mind-Set Approch..... Supporting Vendor

    Messages:
    3,860
    Media:
    21
    Likes Received:
    2,332
    Joined:
    Aug 12, 2007
    Location:
    East Coast





    for those who need or want a new Radiator u have 2 options Aftermarket or OEM , a OEM Toyota one from a Supporting Vendor like @beno

    will have the Drain Tube hole for the Pet-Cock Tube properly positioned over the Cross-Member Through Hole for installation and future use

    during a coolant flush or drain for other repair related reasons



    Now , Aftermarket like @SteveH usually come with that crappy black plastic wing nut that Not in the correct location to use a drain tube

    through the cross-Member , ( this includes the quality built CSF brand too ) U will and I have been forced to remove the Lower Radiator hose

    to drain the cooling system , not only does this SUCK labor time wise , but it makes a huge Mess on the Shop Floor

    i have found only 1 exception to this aftermarket Radiator drain hole location topic , Supporting Vendor Mike @Cruiser Corps sells a

    Aluminum aftermarket

    Radiator with a Cross-Member through hole properly positioned , it comes with a Brass wing Nut and solid black rubber washer


    But u still can't reach or twist the brass wing nut after install due to its tight space above the Cross Member

    the Brass wing nut thread pitch and diameter is much smaller then the OEM toyota drain hole and tube



    so i Designed this :

    - it uses my Full size Reproduction Toyota J.I S. Tube & Pet-Cock

    - then a step-down adapter that matches the thread pitch & diameter of the New Aluminum Radiator

    - I used a special Aluminum washer with vulcanized rubber center , I also applied Toyota Black FIPG 00295-00102 oil pan & cam shaft

    housing sealant to the male tube threads & both sides of the aluminum w/ rubber washer

    - This make for a Bomb-Proof long term trouble free of leaks install ( of the drain tube assy pet-cock kit )





     
    Last edited: Nov 11, 2018 at 11:54 PM
    numby and 65swb45 like this.
  15. RAGINGMATT

    RAGINGMATT Factory Focus-Point Mind-Set Approch..... Supporting Vendor

    Messages:
    3,860
    Media:
    21
    Likes Received:
    2,332
    Joined:
    Aug 12, 2007
    Location:
    East Coast
  16. RAGINGMATT

    RAGINGMATT Factory Focus-Point Mind-Set Approch..... Supporting Vendor

    Messages:
    3,860
    Media:
    21
    Likes Received:
    2,332
    Joined:
    Aug 12, 2007
    Location:
    East Coast
  17. 65swb45

    65swb45 Elder Statesman Supporting Vendor

    Messages:
    23,849
    Likes Received:
    8,625
    Joined:
    Apr 14, 2004
    Location:
    818-953-9230
    This is really good tech!
     
    mrboatman likes this.
  18. Cruiser Corps

    Cruiser Corps Toyota Land Cruiser Parts | Oklahoma City | USA Supporting Vendor

    Messages:
    786
    Likes Received:
    303
    Joined:
    Mar 17, 2010
    Location:
    Oklahoma City, OK
    Leave it to Matt to come up with a fix!

    Good idea. My mind doesn’t ever work that way.

    Once again...... Great job!

    Now......back to work
     
    RAGINGMATT likes this.
  19. PuKE

    PuKE

    Messages:
    134
    Likes Received:
    48
    Joined:
    Jul 12, 2013
    Location:
    Inland Empire - California
  20. PuKE

    PuKE

    Messages:
    134
    Likes Received:
    48
    Joined:
    Jul 12, 2013
    Location:
    Inland Empire - California
    My temporary fix (of IGNORING IT) won't last too much longer...
     
  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.