Chasing threads
- Thread starter DiscoJen
- Start date
That seems correct...but it's been a while since I held one in my hand. As with any blind hole, either hose each out well with solvent/PB Blaster or somesuch or put grease on the tap to catch any swarf. Taps for chasing existing threads aren't as tapered as the ones for cutting new ones. If you find a problem like really buggered threads, you can install slightly larger Heli-Coil or Quali-Zert stainless steel threaded inserts. That's what I did and thus had stainless on stainless WRT the exhaust fittings.
Cheers
Cheers
There's a 'touch' to cutting or chasing threads. You don't want to obliterate the old ones, 'cause there won't be any metal left for the new. Then you have to go oversize with the threaded inserts, but can still use the original-sized hardware. The inserts, if you need to go that route, will specify the size drill and tap on the packaging.
When chasing threads, you want to turn 'ahead' 3/4 or so turn, the back 1/4 turn. Repeat.
When chasing threads, you want to turn 'ahead' 3/4 or so turn, the back 1/4 turn. Repeat.
5/16-24
I strongly suggest using a real chaser and not a tap. It's really easy to screw them up with a tap.
I got this set a few years back. http://www.fleetfarm.com/catalog/pr...ing+search&utm_campaign=google+product search
I strongly suggest using a real chaser and not a tap. It's really easy to screw them up with a tap.
I got this set a few years back. http://www.fleetfarm.com/catalog/pr...ing+search&utm_campaign=google+product search
I got a decent thread restoring kit from sears. It worked pretty good and cost around $40.00 for the whole set. It is not a tap set but works great for cleaning and restoring threads.