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Technical Chevy 230 inline 6 leaking water from a head bolt

Discussion in 'The Hokey Ass Message Board' started by GearSlammer, Nov 18, 2015.

  1. GearSlammer
    Joined: Feb 27, 2013
    Posts: 203

    GearSlammer
    Member

    I have very little experience when it comes to these inline engines. Do the head bolts run through a water jacket or is it something worse?
     

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  2. squirrel
    Joined: Sep 23, 2004
    Posts: 42,943

    squirrel
    Member

    it's too dark and cold to go out to the barn and check...but I would not be surprised, since the same vintage Chevy V8s have all the head bolts threaded into water.
     
  3. shivasdad
    Joined: May 27, 2007
    Posts: 516

    shivasdad
    ALLIANCE MEMBER
    from Texas

    I can check tomorrow morning. I have a bare block in the corner of the shop. I think @squirrel is right . Is it in the middle?
     
  4. GearSlammer
    Joined: Feb 27, 2013
    Posts: 203

    GearSlammer
    Member

    So im hoping thats the case and if so, it just needs to be backed out and new thread sealant?
     
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  5. GearSlammer
    Joined: Feb 27, 2013
    Posts: 203

    GearSlammer
    Member

    No its the second to the last bolt.
     
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  6. chessterd5
    Joined: May 26, 2013
    Posts: 502

    chessterd5
    Member
    from u.s.a.

    I'll check my book when I get home, but I think the answer is yes. If I remember right, even the front head bolt on the driver's side actually threads into the opening for the thermostat housing at the front of the head.
     
  7. shivasdad
    Joined: May 27, 2007
    Posts: 516

    shivasdad
    ALLIANCE MEMBER
    from Texas

    @GearSlammer, Here is a picture of the 230 Chevy block in my shop. All the head bolts clearly hit water, as you can see if my picture is good enough. I also stuck a drill bit into them all to verify. I can't answer your question on sealing it with any authority, but I would take the chance on getting it out, sealing it with thread sealant, and retorquing the single bolt. If you were a bit more cautious, you could take them all out one at a time, apply thread sealant, and then torque in proper sequence. No need to remove the head or break the seal on the gasket. Someone please correct me if I'm wrong. Hope this helps. Take care.



    20151119_095239.jpg
     
  8. chessterd5
    Joined: May 26, 2013
    Posts: 502

    chessterd5
    Member
    from u.s.a.

    what he said ^^. Drain the coolant system so when you pull the bolt it doesn't siphon out anyway & make a mess. Then pull the one bolt & reseal it. Or if you want to make sure find the torque sequence for the head bolts. Pull them out one at a time, reseal them IN ORDER so not to warp the head gasket seal. IT should be fine.
     
  9. GearSlammer
    Joined: Feb 27, 2013
    Posts: 203

    GearSlammer
    Member

    Thanks for the help guys I'll post an update and let you know if that fix the problem.
     
  10. Moselli
    Joined: Feb 16, 2009
    Posts: 90

    Moselli
    Member

    What is everyone's preference for sealant on head bolts that go into a water jacket? Thanks!
     
  11. Engine man
    Joined: Jan 30, 2011
    Posts: 3,476

    Engine man
    Member
    from Wisconsin

    On a new build with everything clean, I use Loctite Head Bolt & Water Jacket Sealant. To re-seal one on a used engine, I've used Teflon tape.
     
  12. GearSlammer
    Joined: Feb 27, 2013
    Posts: 203

    GearSlammer
    Member

    I would have never thought to use teflon. I wonder how it holds up on those high temps
     
  13. Ebbsspeed
    Joined: Nov 11, 2005
    Posts: 4,620

    Ebbsspeed
    ALLIANCE MEMBER

    Teflon tape will hold up fine.
     
  14. Engine man
    Joined: Jan 30, 2011
    Posts: 3,476

    Engine man
    Member
    from Wisconsin

    We use Teflon tape on steam pipes. Pipe thread is tapered. Bolts are straight thread so it doesn't take a very thick layer. It acts as both a lubricant and sealer.
     
  15. squirrel
    Joined: Sep 23, 2004
    Posts: 42,943

    squirrel
    Member

    I use pipe thread sealer with teflon...seems to work ok.

    I'll have to look around for the special loctite head bolt stuff.
     

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