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flathead, new radiator=new problems.

Discussion in 'The Hokey Ass Message Board' started by DOUBLEZO, Mar 28, 2010.

  1. DOUBLEZO
    Joined: Aug 5, 2005
    Posts: 204

    DOUBLEZO
    Member
    from SACramento

    i just had my radiator re-cored and now i have a leak at the rear of one head. nothing was changed exept the radiator. i think its the head gasket but wonder why this would happen after getting my radiator done. any thoughts or suggestions before i tear it apart? motor always runs cool. 8ba 7lb cap. [​IMG] [​IMG] [​IMG]
     
  2. what lb cap did you have before you re-did the radiator?
     
  3. Butch11443
    Joined: Mar 26, 2003
    Posts: 353

    Butch11443
    Member

    Sure it's not a couple of head bolts. Never seen water run uphill yet. Take them out and use #2 permetex on them before you pull the head.
    Butch
     
  4. Pete1
    Joined: Aug 23, 2004
    Posts: 1,920

    Pete1
    Member
    from Wa.

    Looks like bolt seepage. Permatex on the threads will usually stop that.
    Next time use hard flat washers under the bolts.
     

  5. Saxon
    Joined: Aug 9, 2008
    Posts: 2,157

    Saxon
    Member
    from MN

    I believe your cap should be a 4lb cap, not 7lbs.
     
  6. DOUBLEZO
    Joined: Aug 5, 2005
    Posts: 204

    DOUBLEZO
    Member
    from SACramento

    im using the same cap, 7 lbs. all the head bolts are dry. i should of put the third picture first. im pretty sure its leaking where the head and block meet, then leaking down onto manifold as seen in the first and second picture. i havent changed anything but the radiator.
     
    Last edited: Mar 28, 2010
  7. Pete1
    Joined: Aug 23, 2004
    Posts: 1,920

    Pete1
    Member
    from Wa.

    Wait awhile and see if it dries up by itself...
    A small can of Silver Seal helps also.
     
  8. Da Tinman
    Joined: Dec 29, 2005
    Posts: 4,226

    Da Tinman
    Member

    if you changed the radiator because it was leaking, the new radiator is putting more pressure in your system and causing the next weak link to leak.
     
  9. flatjack
    Joined: Feb 13, 2007
    Posts: 912

    flatjack
    Member

    Did you try torquing head bolt(s)?
     
  10. I'd try a 4lb cap...a flathead shouldn't need more than that. I would not recommend any "stop leak".
     
  11. Flatheadguy
    Joined: Dec 2, 2008
    Posts: 2,037

    Flatheadguy
    Member

    Another vote for the above quote. That was my first thought. There MAY be a stud or gasket problem, but if it didn't leak before, this might be correct.
     
  12. DOUBLEZO
    Joined: Aug 5, 2005
    Posts: 204

    DOUBLEZO
    Member
    from SACramento

    alright guys, the radiator did leak, now it doesnt. im going with the thought of the head gasket at the leak point is the next weak link. i dont want to use stop leak etc. so off comes the head. ill let you guys know what i find. thanks for the help.
     

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