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#1
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I stripped 2 of the valve cover threads on my cylinder head for the Daytona so I want to try this myself rather than pay $40 a hole.
Is there a kit or special tools that I need to do this? Any advice or links would be appreciated. Thanx, Rob. |
#2
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Most good parts stores will have a Heli-Coil set to fit your application. You will need to determine the size and pitch of the bolt.
Steps: 1. Drill to the correct oversize demension. Be carefull not to go too deep if it is a closed hole. 2. Use the tap provided with the kit and make clean threads for the Heli-Coil insert. 3. Put the insert on the installation tool and screw it in so that the top coil is about 1/2 a turn below the surface. 4. Remove the little tab from the bottom of the insert with a punch or something. SPECIAL NOTES: 1. Don't use a Heli-Coil that is too long! 2. Make sure you have the correct drill size 3. If you can't remove the little tab, don't use a bolt that will screw in that deep. 4. A Heli-Coil kit costs about $15 per size and has several inserts. Good luck Billy |
#3
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I'd like to add just a few note on top of Billydelrio's reply which is great.
a....use a paperclip to measure the depth of each hole you are going to drill. Mark the paperclip then put it next to the drill so it is even with the tip, then mark the drill with a paint stick so you know how far to go. b.....Make sure to completly cover (mask) everything around the holes that are being drilled so you dont get chips in the heads. c.......use motor oil on the tap. If it binds up or you feel excess pressure to turn the tap.....STOP and back it completly out to remove the chips. Then continue back in and repete as necessary. d......after you're done. use compressed air from a compresser or canned and blow out the hole completly. Keep the heads masked and glasses on when you do this......Good luck.....dj |
#4
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Here is another idea for cleanliness. Do you have a magnet? Or a magnetic tool for picking up parts you drop in hard to reach places? I snapped off a rocker arm bolt in my360. I kept cleaning the filings with it. Good luck!
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#5
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In case you don't have experience with tapping, these apply to all tapped holes.
1) Drill straight and don't make the hole oversize. 2) Clean out the hole before and during threading. This is very important in blind, ie closed holes. 3) A countersink the diameter of the tap helps starting. 4) Start the tap as straight as you can, very important. 5) Once started, turn the tap in about 3 turns, then back off 0.5 to 1.0 turns. 6) After that turn in 1 to 2 turns, then back off again. |
#6
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I have done this!!
I had to do this on my 69 Road Runner, three holes were toast! Everything that has been listed here is the way to go. The only thing I would add is, not to use a drill that has so much torque that it can turn you around when and if it binds. Take your time and use a drill that you can vary the speed, go slow!! Mine worked out great.
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#7
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Thanx for the replies guys!!
Since it is an aluminum head I will be working on I'll probably use my Makita cordless drill which is lightweight and should have enough power for the job. If it works out good maybe I'll use helicoils on my *cough* GM LT1 heads for headers. Wish me luck. Rob. |
#8
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Much thanx to you guys for the tips on the helicoil installation. So far so good. The kit from Pep-boys was expensive though, $29, but I probably would have been charged 2-3 times more for someone else doing it.
Too bad the problems never end: http://www.moparchat.com/forums/show...threadid=24294 |
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