Rod Bolt Stretch
Moderator: Team
Rod Bolt Stretch
What would cause large increase of torque to achieve correct rod bolt stretch,3rd use of bolts and original rods?
-
- Guru
- Posts: 9633
- Joined: Tue Nov 27, 2007 9:27 am
- Location: Chicago
- Contact:
Re: Rod Bolt Stretch
An increase in friction of the bolt and nut (rod) threads will increase the torque required
for a given bolt stretch.
Check for distorted or damaged threads of rod and bolt.
-
- Guru
- Posts: 4607
- Joined: Sun Sep 18, 2011 11:31 am
- Location: Heading for a bang up with Andromeda as we all are.
Re: Rod Bolt Stretch
Your bolts could have stretched in the thread area which has changed the thread pitch some.
I would not chance reusing them unless you had 100% no choice!
I would not chance reusing them unless you had 100% no choice!
You can cut a man's tongue from his mouth, but that does not mean he’s a liar, it just shows that you fear the truth he might speak about you!
-
- Guru
- Posts: 1758
- Joined: Wed Aug 26, 2009 8:30 pm
- Location: Beautiful Southern Maryland
- Contact:
Re: Rod Bolt Stretch
Are you using the same lubricant as originally ? Same torque wrench ? What are you considering a "large" difference ? Have the bolts stretched from their original unstretched length ?
Also how are you actually checking it ??
Also how are you actually checking it ??
Bill Koustenis
Advanced Automotive Machine
Waldorf Md
www.enginerepairshop.com
Advanced Automotive Machine
Waldorf Md
www.enginerepairshop.com
-
- Expert
- Posts: 537
- Joined: Mon Dec 12, 2016 3:37 pm
- Location:
Re: Rod Bolt Stretch
perhaps you torqued them to spec in the past, correct?
and now you are using the stretch method to reach the desired preload and are saying to yourself "wow, that's more torque than I would have imagined" to get the bolt stretched .006"
and now you are using the stretch method to reach the desired preload and are saying to yourself "wow, that's more torque than I would have imagined" to get the bolt stretched .006"
-
- Pro
- Posts: 414
- Joined: Sat Aug 23, 2008 7:12 am
- Location: