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Post by islandscrub on Jul 31, 2017 2:10:17 GMT -5
Aloha!
So, yea.
Any guidance? There's a little meat left (6 or so threads) at the deepest part of the threaded hole, seems tight but worst case, what can be done? I know I can drill and tap, but not sure how to get that straight without F-ing it up as I have no drill press. I was poking around and saw something called time-serts mentioned, and a supposed post by 90gtvert about it, but I can't find that one.
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Post by geoffh on Jul 31, 2017 15:47:22 GMT -5
This is not what you you wanted to read,but even with the barrel inverted in drill press it,s still a tricky job,I,ve tried several times and spent too much time trying to save a barrel.I,d just put a new stud in and wing it for a while,long term if your keeping the scoot like me,I just replace the barrel as I need to, I buy the cheapest cast iron kit I can find and I have studs in my toolbox along with a top end gasket set ready to go.Most of my barrel failiers are due to puncture repairs and the British weather ganging up on me.Try thread insert or thread repair kit, over here we call them Heli coil kits they sound great but you need a machine shop to use them properly
geoff
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Post by jackrides on Jul 31, 2017 18:20:30 GMT -5
Heli-coil inserts can be installed by hand if done Carefully. The engine has to come out of the frame to have working clearance. Before you begin, install the stud as far as it can go. Wrap tape around the stud where it goes into the case. Remove the stud and hold it inside the cylinder hole in the case with the tape flush with the top of the case. Mark the case at the bottom of the stud. Now measure how far you could drill before drilling into the crankcase, cause you don't want to put metal shavings in there. Wrap tape around the helicoil drill bit that distance from the bottom of the drill bit. Hold the drill bit as you did the stud to be Sure it won't go into the crankcase. Sure you want to go on?
Here's what you need. A good electric drill. Clean rags to stuff into the crankcase hole. Heli-coil kit. Blue Loctite. Compressed air. A friend to stand or sit on the engine to hold it very steady. Beers for after.
Really tighten the bit in the drill. Do not start yet. Get friend, drill, and yourself in comfortable position and practice moving the drill Straight into the hole. Remember why the tape is there, deep breath, exhale and begin. Don't push in too fast and hold the drill tight. It'll be over quick. Done right, it didn't hurt a bit, did it. Use the compressed air to blow the shavings out of the hole. Follow the Heli-coil instructions. One drop of Loctite on the stud and install. Go to your computer and print out your apprentice machinist certificate. Open beers.
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Post by 90GTVert on Aug 1, 2017 6:37:48 GMT -5
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Post by islandscrub on Aug 1, 2017 12:39:47 GMT -5
Thanks guys. I actually just went with the cheapo option and high heat JB welded the thing in there. I checked and there is enough threads deeper in to hold the pin, but because the first handful of threads are stripped it wiggled a bit. Feels solid now but torquing it down to 12 ft. lb. will be the real test.
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