connecting rod nuts
I am rebuilding a 350 Chevy small block engine. Having seen what happens
when a connecting rod is "thrown" I am wondering if it might be beneficial to use Loctight thread locker. Anyone ever use thread locker with disastrous results? Recommendations for or against using thread locker on the connecting rod bolts would be appreciated? Blue, Red or High temp? Dave |
"David A." > wrote in message
... >I am rebuilding a 350 Chevy small block engine. Having seen what happens > when a connecting rod is "thrown" I am wondering if it might be beneficial > to use Loctight thread locker. Anyone ever use thread locker with > disastrous results? Recommendations for or against using thread locker on > the connecting rod bolts would be appreciated? > > > > Blue, Red or High temp? > > > > Dave > > Do not use anything on the bolts use new conrod bolts and torque properly. If your conrods bolt holes are sloppy get new ones. -- HarryS > |
the proper way to torque rod bolts is
to measure the rod bolt stretch while torqing to specified value. rod bolts/nuts should not be re-used especially in a H/P application. -- Mad-Dog '79 Chevy K-10 Slightly modified http://mad-dog16.tripod.com/ -- "David A." > wrote in message ... > I am rebuilding a 350 Chevy small block engine. Having seen what happens > when a connecting rod is "thrown" I am wondering if it might be beneficial > to use Loctight thread locker. Anyone ever use thread locker with > disastrous results? Recommendations for or against using thread locker on > the connecting rod bolts would be appreciated? > > > > Blue, Red or High temp? > > > > Dave > > > |
I have never heard of measuring bolt stretch before, not that I would have any reason to know such things. How would that be done? I have a few Micrometers and a set of calipers so I could measure each bolt before installation to get a base line, but measuring each bolt for stretch while in the process of, would present a few obvious difficulties. Is the suggested torque based on the stretch that will theoretically occur to the given bolt? Is this a percentage of the length or the diameter of the bolt? I did feel what seemed to be a slight give while tortuing down the connecting rod bolts but assumed that I was in the early stages of stripping the threads. To be honest I thought I had over torqued the bolts and did order new ones. I then posted to the news group with my question. Being ignorant of the proper technique I thought it best to ask for help. Perhaps my first attempt was correct and I just didn't know it. Either way I have new bolts now and would very much like to feel confident in my assembly of same. Dave. "Mad Dog" > wrote in message ... > the proper way to torque rod bolts is > to measure the rod bolt stretch while torqing to specified value. > rod bolts/nuts should not be re-used > especially in a H/P application. > > -- > Mad-Dog > '79 Chevy K-10 > Slightly modified > http://mad-dog16.tripod.com/ > -- > "David A." > wrote in message > ... > > I am rebuilding a 350 Chevy small block engine. Having seen what happens > > when a connecting rod is "thrown" I am wondering if it might be beneficial > > to use Loctight thread locker. Anyone ever use thread locker with > > disastrous results? Recommendations for or against using thread locker on > > the connecting rod bolts would be appreciated? > > > > > > > > Blue, Red or High temp? > > > > > > > > Dave > > > > > > > > |
Should I lightly oil the bolts before I install them or just install dry?
45 lbs. of torque as per the guidelines or a different torque when dry? "HarryS" > wrote in message ... > "David A." > wrote in message > ... > >I am rebuilding a 350 Chevy small block engine. Having seen what happens > > when a connecting rod is "thrown" I am wondering if it might be beneficial > > to use Loctight thread locker. Anyone ever use thread locker with > > disastrous results? Recommendations for or against using thread locker on > > the connecting rod bolts would be appreciated? > > > > > > > > Blue, Red or High temp? > > > > > > > > Dave > > > > > Do not use anything on the bolts use new conrod bolts and torque properly. > If your conrods bolt holes are sloppy get new ones. > > -- > HarryS > > > > > |
Bolt stretch is the BEST way to measure the actual clamping force of a
fastener, BUT for some applications it isn't possible. So folks came up with a torque table and the angle gauge systems as a tool to help in those applications. However con-rod bolts are easy if you have a gauge. Since you don't you could use mics but it may take a while. I have a bolt gauge that slides over the rod and reads stretch directly off the bolt (looks like a C-clamp with a dial indicator on the top. The stretch amount varies though depending on grade of the bolt and manufacturers specs. -- Steve Williams Near Cooperstown NY "David A." > wrote in message ... > > > I have never heard of measuring bolt stretch before, not that I would have > any reason to know such things. How would that be done? I have a few > Micrometers and a set of calipers so I could measure each bolt before > installation to get a base line, but measuring each bolt for stretch while > in the process of, would present a few obvious difficulties. > > > > Is the suggested torque based on the stretch that will theoretically occur > to the given bolt? Is this a percentage of the length or the diameter of > the bolt? > > > > I did feel what seemed to be a slight give while tortuing down the > connecting rod bolts but assumed that I was in the early stages of stripping > the threads. To be honest I thought I had over torqued the bolts and did > order new ones. I then posted to the news group with my question. > > > > Being ignorant of the proper technique I thought it best to ask for help. > Perhaps my first attempt was correct and I just didn't know it. Either way > I have new bolts now and would very much like to feel confident in my > assembly of same. > > > > > > Dave. > > > "Mad Dog" > wrote in message > ... > > the proper way to torque rod bolts is > > to measure the rod bolt stretch while torqing to specified value. > > rod bolts/nuts should not be re-used > > especially in a H/P application. > > > > -- > > Mad-Dog > > '79 Chevy K-10 > > Slightly modified > > http://mad-dog16.tripod.com/ > > -- > > "David A." > wrote in message > > ... > > > I am rebuilding a 350 Chevy small block engine. Having seen what > happens > > > when a connecting rod is "thrown" I am wondering if it might be > beneficial > > > to use Loctight thread locker. Anyone ever use thread locker with > > > disastrous results? Recommendations for or against using thread locker > on > > > the connecting rod bolts would be appreciated? > > > > > > > > > > > > Blue, Red or High temp? > > > > > > > > > > > > Dave > > > > > > > > > > > > > > > -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
David A. wrote:
> Should I lightly oil the bolts before I install them or just install dry? > > 45 lbs. of torque as per the guidelines or a different torque when dry? > > Most torques specs are based on dry threads if it is not stated otherwise. If you use oil, you will over torque and amy strip them. If you felt them *give* as was stated in your previous post, throw them out and start over. |
yes, I will start over. thank you.
"Rob Munach" > wrote in message ... > David A. wrote: > > > Should I lightly oil the bolts before I install them or just install dry? > > > > 45 lbs. of torque as per the guidelines or a different torque when dry? > > > > > > Most torques specs are based on dry threads if it is not stated > otherwise. If you use oil, you will over torque and amy strip them. If > you felt them *give* as was stated in your previous post, throw them out > and start over. |
Steve W. > wrote:
> Bolt stretch is the BEST way to measure the actual clamping force of a > fastener, BUT for some applications it isn't possible. So folks came up > with a torque table and the angle gauge systems as a tool to help in > those applications. However con-rod bolts are easy if you have a gauge. > Since you don't you could use mics but it may take a while. I have a > bolt gauge that slides over the rod and reads stretch directly off the > bolt (looks like a C-clamp with a dial indicator on the top. The stretch > amount varies though depending on grade of the bolt and manufacturers > specs. > -- > Steve Williams > Near Cooperstown NY > "David A." > wrote in message > ... > > > > > > I have never heard of measuring bolt stretch before, not that I would > have > > any reason to know such things. How would that be done? I have a few > > Micrometers and a set of calipers so I could measure each bolt before > > installation to get a base line, but measuring each bolt for stretch > while > > in the process of, would present a few obvious difficulties. > > > > > > > > Is the suggested torque based on the stretch that will theoretically > occur > > to the given bolt? Is this a percentage of the length or the diameter > of > > the bolt? > > > > > > > > I did feel what seemed to be a slight give while tortuing down the > > connecting rod bolts but assumed that I was in the early stages of > stripping > > the threads. To be honest I thought I had over torqued the bolts and > did > > order new ones. I then posted to the news group with my question. > > > > > > > > Being ignorant of the proper technique I thought it best to ask for > help. > > Perhaps my first attempt was correct and I just didn't know it. > Either way > > I have new bolts now and would very much like to feel confident in my > > assembly of same. > > > > > > > > > > > > Dave. > > > > > > "Mad Dog" > wrote in message > > ... > > > the proper way to torque rod bolts is > > > to measure the rod bolt stretch while torqing to specified value. > > > rod bolts/nuts should not be re-used > > > especially in a H/P application. > > > > > > -- > > > Mad-Dog > > > '79 Chevy K-10 > > > Slightly modified > > > http://mad-dog16.tripod.com/ > > > -- > > > "David A." > wrote in message > > > ... > > > > I am rebuilding a 350 Chevy small block engine. Having seen what > > happens > > > > when a connecting rod is "thrown" I am wondering if it might be > > beneficial > > > > to use Loctight thread locker. Anyone ever use thread locker with > > > > disastrous results? Recommendations for or against using thread > locker > > on > > > > the connecting rod bolts would be appreciated? > > > > > > > > > > > > > > > > Blue, Red or High temp? > > > > > > > > > > > > > > > > Dave A little overkill don't you think? For stock rods with stock bolts just torque to spec's and all should be well. Rod failure tends to happen once the bearing spins. |
>From: Edward Strauss
> Rod failure tends to >happen once the bearing spins. > > its all connected(no pun intended).... the bearing usually spins due to too much clearance, which can alot of times be a direct result of the rod bolts stretching, causing excessive clearance. this usually does not happen in stock engines that are run the way they were intended, but does happen when stock rods are used in performance applications.... ARP rod bolts are a great upgrade for this reason.... ------------------- Chris Perdue "Sometimes you're the windshield, sometimes you're the bug!" Remove "PANTS" to e-mail |
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