Author Topic: Crankshaft bolt  (Read 1262 times)

Offline Those

  • Jr. Member
  • **
  • Posts: 73
Crankshaft bolt
« on: October 22, 2014 - 03:46:23 PM »
Hi guys. Could someone tell me what size and type of thread tap I would need to clean up the damper bolt threads on a 340 crank. I can see there's a bad spot on the first 2 threads and the bolt threads are being flattened by it. I only went in one turn and new it was tight. Thanks to all replies.




Offline blown motor

  • Resident
  • *****
  • Posts: 3013
Re: Crankshaft bolt
« Reply #1 on: October 22, 2014 - 04:08:06 PM »
Run a die over the bolt to determine the right size.
In search of the eternal buzz!

Offline Those

  • Jr. Member
  • **
  • Posts: 73
Re: Crankshaft bolt
« Reply #2 on: October 22, 2014 - 05:44:14 PM »
Good idea but my tap and die set doesn't go that big so I have to buy what ever size it is.

Offline 1 Wild R/T

  • Resident
  • *****
  • Posts: 4594
Re: Crankshaft bolt
« Reply #3 on: October 22, 2014 - 08:55:29 PM »
3/4-16
JS27N0B 70 Challenger R/T Convertible  FJ5 Sublime, Show Poodle w/90,000 miles since resto
WS27L8G 68 Coronet R/T Convertible  PP1 Bright Red, Project
RM21H9E 69 Road Runner Coupe R4 Performance Red, Sold...
5H21C  65 Falcon 2 dr Wagon... Dog Hauler...

Offline cudabob496

  • Sr. Resident
  • ******
  • Posts: 8024
Re: Crankshaft bolt
« Reply #4 on: October 22, 2014 - 09:02:00 PM »
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

2011 Kawasaki Z1000

Offline Those

  • Jr. Member
  • **
  • Posts: 73
Re: Crankshaft bolt
« Reply #5 on: October 22, 2014 - 09:53:47 PM »
Thanks guys.