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CRAP! stripped bolt hole in cyl head for intake manifold bolts

Discussion in 'Engine Topic' started by need-for-speed, Mar 4, 2017.

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  1. Mar 5, 2017 #11
    70-camaro

    70-camaro Veteran Member

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    The drill bit should follow the hole. Spend the money on drilling/tapping fluid for aluminum and use it for both. Back the tap out every couple of threads and clean out the shavings from the tap and hole. Use fluid each time. You will be okay doing this.
     
  2. Mar 5, 2017 #12
    Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    If you're using a heli-coil repair kit... They come with a special sized bit and tap for the inserts.
    The drill bit just removes the old threads. You shouldn't have any problem keeping the hole straight.
     
  3. Mar 5, 2017 #13
    need-for-speed

    need-for-speed Veteran Member

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    That is correct. They are "thru" holes. Good idea on the grease.

    Thanks.
     
  4. Mar 5, 2017 #14
    need-for-speed

    need-for-speed Veteran Member

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    Thanks. Good idea on the long bolt visual aid. I was also thinking of using a series of bits, with the first one being just large enough to grab the threads and increasing bit size in very small increments. I don't know though, it sounds good in theory?
     
  5. Mar 5, 2017 #15
    need-for-speed

    need-for-speed Veteran Member

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    Thanks dawg. I have already used a thread chaser and it did fix one of the 2 holes. I am past the rethread option. I plan to do a thread repair such as heliciol or Timesert. I'll Probably use the timesert, I like how it has a flange on top.
     
  6. Mar 5, 2017 #16
    need-for-speed

    need-for-speed Veteran Member

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    Thank you. I will take your advice on buying the special cutting fluid.

    p.s. One guy recommended using a reamer instead of a drill bit. Would that be a worthwhile thing? Are reamers expensive? I don't mind spending some money if it's worthwhile (and saves me from pulling the cylinder head if I feck it up LOL)
     
    Last edited: Mar 5, 2017
  7. Mar 5, 2017 #17
    70-camaro

    70-camaro Veteran Member

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    Drill bit should be OK. Bit might come with heli-coil kit. No need to drill a series of holes. The bolt in the hole next to it for a visual can't hurt if it isn't in the way.
     
  8. Mar 5, 2017 #18
    TommyRS70

    TommyRS70 Veteran Member

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    Magnet in valley near open holes might help catch debris also. Good luck.
     
  9. Mar 5, 2017 #19
    70-camaro

    70-camaro Veteran Member

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    Aluminum won't stick to a magnet.
     
  10. Mar 5, 2017 #20
    Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    Get a kit.
    Comes with the proper bit and tap for the inserts.
     
    lumpy12 likes this.
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