MoparFins

Techical Discussions => Tech- - Engine => Topic started by: Brian on August 12, 2009, 01:58:33 PM

Title: Crank Threads...
Post by: Brian on August 12, 2009, 01:58:33 PM
OK I'm A F-N idiot!!!(http://www.moparfins.com/forum/smileys/smiley7.gif)
 
I have been working to pull the front off my 331 Hemi...has been a stow and paintful process due to so many years of sitting.  So I eventually got the harmonic balancer bolt out and then decided I would pull the balancer off. 
 
Well me having a brain fart I did not re-install the bolt and just used a cone filling on my puller straight into the threads....well the blanceer would not come loose and I really cranked on it!  Now I seem to have damaged the first couple threads and can't get the bolt to go back in.(http://www.moparfins.com/forum/smileys/smiley36.gif)
 
So is there and easy fix for this that I can do at home or is this a machine shop repair?
 
Title: Crank Threads...
Post by: Alan on August 12, 2009, 04:34:14 PM
Run  a tap into it, just be carefull getting it starting so you don't cross thread it. If the first couple of threads are too damaged, you may want to remove them with a dremel, be carefull not to go beyond the damaged threads.
67Newport2009-08-12 21:34:46
Title: Crank Threads...
Post by: Brian on August 12, 2009, 04:36:29 PM
That is what I was thinking since there is over 2 1/2" of thread going into the crank and the bolt only use maybe 3/4".
 
 
Title: Crank Threads...
Post by: Brian on August 16, 2009, 08:43:14 PM
Well had the parents over for dinner this weekend, so the old man brought over the big tap and die set.
Turned out to be a NC16 3/4" thread chaser I used.  I started the tap by hand and then got out the micrometer and measured from the outside of the balancer to the tap. All my measurements were within .002 of each other so I figured it had to be pretty straight with the crank.
 I then pushed in hard with my hand on the end of the tap and then slowly turned the tap in and out with a cresent wrench, and with lots of lube!  Chased it all the way down and man did it pull out a lot of rust, gum, rocks and crap!!
 So I can now sleep better now knowing all is well...thanks again for the advice!!
Title: Crank Threads...
Post by: Snotty on August 17, 2009, 11:18:32 AM
Glad to hear it Brian.
Title: Crank Threads...
Post by: Tom Dawson on August 17, 2009, 05:31:21 PM
have you tried heating the old balancer to get it off???
Tom
Title: Crank Threads...
Post by: Brian on August 17, 2009, 07:08:26 PM
Quote from: furyman67
have you tried heating the old balancer to get it off???
 
Yup and I then bent my puller too...I was using a steering wheel type puller not a 2 or 3 jam unit.   I'm going to borrow a big Kahoona puller from my 93 year old neighbour and see if that will break the beast loose.
Title: Crank Threads...
Post by: Steve on August 19, 2009, 12:46:41 PM
Shame. . .  (http://www.moparfins.com/forum/smileys/smiley36.gif)
 
I have that tap if you ever need ti again
Title: Crank Threads...
Post by: Brian on August 22, 2009, 07:46:00 PM
Thanks for the offer Steve....(http://www.moparfins.com/forum/smileys/smiley4.gif)
 
I'll keep it in mind but I have a feeling I WON"T be dong this again.