408ci stripped crank threds!!!!!!
408ci stripped crank threds!!!!!! so were putting a march pulley that by the way is hard to do but anyways the threads decided to go out.. Im using the arp bolt that speed inc sells but i guess since theres was so much pressure when the crank was going in the threads went out. what i wanted to know is that what size tap and bolt did guys use when you guys had this similar problem, I've seen a bunch of guys that did something similar but they never put what size tap and bolt did they end up using..?? any how to's would help with this issue? thnx
How many threads did the bolt have a hold of when you were installing the pulley? Most of the time you want to use a longer crank bolt so you are grabbing as much thread as possible so you dont strip them out. You may be SOL and end up gettin a new crank...depends on how bad it is. Did you strip out just the front threads or all of them? The stock thread pitch is M16 x 2.0.
I helicoiled mine a few years ago.Its a 16m x 2.0.Its not easy to find a helicoil that big,luckily I found a place local to me called Mcfaden Dale that stocks it.You might be able to get a local car parts place to order it.Its not cheap as well.I think it was a little under a $100 to get everything.Drill,tap,helicoils, and the insert tool.I also bought a group of extra helicoils.
Originally Posted by joshp14
How many threads did the bolt have a hold of when you were installing the pulley? Most of the time you want to use a longer crank bolt so you are grabbing as much thread as possible so you dont strip them out. You may be SOL and end up gettin a new crank...depends on how bad it is. Did you strip out just the front threads or all of them? The stock thread pitch is M16 x 2.0.
i think somewhere near the beginning. i think like 1/2 inch into the threads.. i was thinking of getting a tap that is m16x2.0 and try re-threading the bad threads hoping the bolt will grab good threads again and go all the way in..
Trending Topics
Originally Posted by GuitsBoy
Try mcmaster carr for the helicoil and tap. Drill is 20, tap is 47, inserts are $3.
hey bro what is this mcmaster carr?? by the way If i get to the point that i need to tap the threads again your suggesting using #20 drill, and tap 47?
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
If you have a good bolt cut a groove in it with a cut off wheel or a dremel. Go the length of the threads. Thread that in and it will clean up the remaining threads. Flush it out good when your done..
Timesert is another choice if you need to fix the threads.Ive used there kits and they make some nice stuff you would put in a insert instead of a heicoil.www.timesert.com
Originally Posted by pewter 01 SS
hey bro what is this mcmaster carr?? by the way If i get to the point that i need to tap the threads again your suggesting using #20 drill, and tap 47?
Thos numbers were prices. Youll need a M16x2 helicoil tap (not a regular 16x2 tap) then youll also need the recommended M16.5 drill.
Originally Posted by CANNIBAL
Never use a bolt to install the balancer. Always use a proper balancer installer (threaded rod w/nut and thrust bearing).
i made a setup like this using parts from mcmaster carr for like $20. it works great.
TECH Regular
Joined: Aug 2005
Posts: 470
Likes: 0
From: Home
I guess I'm you're brother from a parallel universe because I had EXACTLY the same thing happen to me.
I worked on it for seriously 3-4 weeks on/off and in the end I ended up drilling out the threads and retapping them.
I worked on it for seriously 3-4 weeks on/off and in the end I ended up drilling out the threads and retapping them.
Originally Posted by Zeus
I guess I'm you're brother from a parallel universe because I had EXACTLY the same thing happen to me.
I worked on it for seriously 3-4 weeks on/off and in the end I ended up drilling out the threads and retapping them.
I worked on it for seriously 3-4 weeks on/off and in the end I ended up drilling out the threads and retapping them.
by any chance do you remember what size tap and drill bit you used?? by the way what type of bolt did you end up using? high quality or what
i know the fustration now, i never thought this would happen to me..
