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cylinder head stripped...

Discussion in 'Mechanic and Repair' started by lawnmaniac883, Oct 25, 2005.

  1. lawnmaniac883

    lawnmaniac883 LawnSite Silver Member
    Messages: 2,613

    Was replacing some rocker arms on a buddies old proline today. Get to last one and of course, it had to strip out on me. So, I suggested drilling and tapping to the next larger size thread. Is this a good idea? Any suggestions are appreciated.
     
  2. grass_cuttin_fool

    grass_cuttin_fool LawnSite Gold Member
    Messages: 3,526

    MAybe heli-coil it. To move up a complete size is gonna be taking alot of metal out.
     
  3. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    I second the heli-coil idea, Less chance of further problems and you may not be able to get a larger screw in the rocker. (you didn't state which engine)
     
  4. lawnmaniac883

    lawnmaniac883 LawnSite Silver Member
    Messages: 2,613

    Engine has non-adjustable valves in it. True that a larger screw would not fit without being drilled. Now to go about installin a heli-coil, I have to re tap the hole then torque these things in? Never used one before, so instruction on the topic is appreciated.
     
  5. jblawns123

    jblawns123 LawnSite Senior Member
    Messages: 340

    You get a Heli-coil kit. It comes with the right sized drill, then you tap with the included tap. Then you screw in the heli-coil with supplied tool. Then your threads are new again.

    The kits come in all different sizes, see a good auto supply store.

    I would like to add that in all my heli-coil experiences I have had 100% success!
     
  6. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    Just a pointer, When installing the coil with the supplied tool put a SLIGHT steady pressure on the tool at all times while twisting and hold the tool centered with the hole, They can jump a thread then you have another problem.
     
  7. lawnmaniac883

    lawnmaniac883 LawnSite Silver Member
    Messages: 2,613

    Sounds good fellas, is this gonna be found at autozone or do I need to order online?
     
  8. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    You can check there or NAPA is where I get mine.
    Good Luck
     
  9. xcopterdoc

    xcopterdoc LawnSite Senior Member
    Messages: 752

    Good idea on the Helicoil... I always put a lil Loc-Tite red on the insert... that way if I ever have to remover the bolt, the insert wont come with it. Also if its a closed bottom hole, that is shallow, you may have problems with out the proper bottom tap.
     

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