Mike Phillips Posted October 12, 2008 Report Share Posted October 12, 2008 Went to bolt on my exhaust manifold and found the first threads in the front most hole to be a little stripped. Bolt size is 8mm x 1.25 I have a tap but it just seems to want to cut everything up as I start it. I have a known good threaded bolt but it just gets tighter as I try to thread it in. Is there a better tool for cleaning these threads? Ugh.... Mike Quote Link to comment
datzenmike Posted October 12, 2008 Report Share Posted October 12, 2008 Bolt size is 8mm x 1.25 I have a tap but it just seems to want to cut everything up as I start it. I have a known good threaded bolt but it just gets tighter as I try to thread it in. Mike Sure about the bolt and tap size cause it should thread in. On the plus side you can oversize and tap it. Quote Link to comment
]2eDeYe Posted October 12, 2008 Report Share Posted October 12, 2008 I like heli-coils, steel threads in aluminum are stronger than threads in aluminum. Stud's also enable more clamping force than bolts. Quote Link to comment
Mike Phillips Posted October 12, 2008 Author Report Share Posted October 12, 2008 Sure about the bolt and tap size cause it should thread in. On the plus side you can oversize and tap it. I'll try again tomorrow, I have a longer bolt of the same thread that I think I'll bolt into the head and then use my Moto-Tool to cut the head off turning it into a stud and then deal with any thread issues down the road. The goal is to get the truck on the road running and dependable. Thanks! :) Quote Link to comment
dat521gatherer Posted October 12, 2008 Report Share Posted October 12, 2008 i hate heli coils. i think there are 2 different taps. one for cutting new threads and one for cleaning old threads. i read that somewhere and dont know if it's true. Quote Link to comment
Duke Posted October 12, 2008 Report Share Posted October 12, 2008 i hate heli coils. i think there are 2 different taps. one for cutting new threads and one for cleaning old threads. i read that somewhere and dont know if it's true. Thats true. To clean threads you use a thread chaser, not an actual tap. Quote Link to comment
datzenmike Posted October 12, 2008 Report Share Posted October 12, 2008 Not a perfect answer but I have taken old head bolts and ground off the threads down 3 narrow strips along the thread length. Rub a little grease into these cavities and as you thread it in, the threads cut and push any debris into the ground out area and the grease holds it. Back it out, wipe it off and do it again till it comes out clean. Quote Link to comment
Mike Phillips Posted October 12, 2008 Author Report Share Posted October 12, 2008 Thats true. To clean threads you use a thread chaser, not an actual tap. That's the tool. Couldn't think of the name. Thread Chaser I've already taken care of it but will check with NAPA and see if they can get me one if needed in the future. :) Quote Link to comment
banzai510(hainz) Posted October 17, 2008 Report Share Posted October 17, 2008 Redeye You mean Keenserts(steel threaded in to the aluminum) Quote Link to comment
]2eDeYe Posted October 17, 2008 Report Share Posted October 17, 2008 Hey there Hainz :) yep...or threaded inserts, they have many names and styles. I like heli-coils because they have a smaller OD than some other styles. You don't remove much material to install them in a stripped out hole. In my line of work you never thread aluminum unless that bolt will stay there forever. I've probably used about every style http://www.mcmaster.com sells at one time or another. Aluminum is really soft and can lose it's grip after a pulling a steel bolt a few times. Quote Link to comment
ppeters914 Posted October 19, 2008 Report Share Posted October 19, 2008 That's the tool. Couldn't think of the name. Thread Chaser I've already taken care of it but will check with NAPA and see if they can get me one if needed in the future. Yeah, I bought a set from Sears. Invaluable for general clean-up. Quote Link to comment
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