Home » Public Forums » GMCnet » [GMCnet] Output shaft bolt size
| Re: [GMCnet] Output shaft bolt size [message #224919 is a reply to message #224914] |
Tue, 08 October 2013 21:22   |
Dave Mumert
Messages: 272
Registered: February 2004
Location: Olds, AB, Canada
Karma: 0
|
Senior Member |
|
|
Hi
In case anyone wants to get their hands on Nord-Lock washers they are available from Amazon ($21 for 50 pieces- 25 pairs)
Dave
> On my own coach i will be using new bolts and some nord-lock washers. These washers actually increase clamping forces on the
> fastener should it start to rotate loose. I've used them for years on some of my VWs & AUDIs to prevent the inner CVJ bolts from
> coming loose and they work as advertised.
>
> http://www.nord-lock.com
>
> Les Burt
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
|
|
| Re: [GMCnet] Output shaft bolt size [message #224943 is a reply to message #224919] |
Wed, 09 October 2013 08:56 |
GMC_LES
Messages: 569
Registered: October 2009
Location: Montreal
Karma: 0
|
Senior Member |
|
|
I was able to get my supply of Nord-lock washers from Fastenal.
Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
On Oct 8, 2013, at 10:22 PM, "Dave Mumert" <dave@mumert.com> wrote:
> Hi
>
> In case anyone wants to get their hands on Nord-Lock washers they are available from Amazon ($21 for 50 pieces- 25 pairs)
>
> Dave
>
>> On my own coach i will be using new bolts and some nord-lock washers. These washers actually increase clamping forces on the
>> fastener should it start to rotate loose. I've used them for years on some of my VWs & AUDIs to prevent the inner CVJ bolts from
>> coming loose and they work as advertised.
>>
>> http://www.nord-lock.com
>>
>> Les Burt
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
|
|
|
|
|
|
|
|
| Re: [GMCnet] Output shaft bolt size [message #225018 is a reply to message #224907] |
Wed, 09 October 2013 18:48 |
 |
Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
|
Senior Member |
|
|
Too Much - It needs to be done right!
| Quote: |
I did some quick research and found that the axial clamping force of a 180000 psi 3/8"-24 fastener at 70 lb-ft of torque is right around 10,000 lbs. This pressure is borne on the interface surface between the CV flange's bolt-hole perimeter and the surface under the head of the bolt. If for whatever reason that tremendous amount of friction cannot keep the bolt from loosening then I do not think a piece of 0.030 safety wire is going to stop it either - at least not for long.
--Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
|
I really didn't want to step into this thread just now. I have plenty to do recovering from the harddrive failure in my laptop and the loss of a memory stick and something else (yet undiscovered) in my desktop system. So, I have been busy and annoyed for the last three days.....
Now, having been a fastener engineer, I can tell you that in a hard joint (no crushable gasket), it would take little to no rotation at all to loose a very serious amount of fastener tension. We used to do tension/rotation studies of hard joints all the time (like mains and rods). I can assure you that the tension curve gets pretty near vertical at the design load.
Would safety wire help?
It wouldn't hurt, except that drilling (OK EDM) the head of that hard a fastener might well cause it to fail during tensioning. And, you better learn to do the safety wire job correctly so it holds tension or it will be worse than a waste of time. (I learned that trying to keep the drive axles on a 175hp Karman Ghia shaped "modified stock sedan" long before I even finished my first bachelor's.)
Something else to be aware of.... The fasteners that McMaster-Carr has have a 3/8 12 point head and the OE parts are 7/16. So, while you are ordering screws and washers, get the socket at the same time and carry them all in a plastic jar in your Oh-S... kit.
I have to believe that the responsible engineer for that joint was counting on the developed friction. Very simply, if he had been counting on the shear strength of the fasteners, they would have had to be much larger and then there would also be the issue of that same fastener embedding in the drive flange and distorting the threads.
Do they really have to be pulled to a tightening torque of 70#ft?
I would not want to do less, but when I have pulled mine up, I am trying to be very aware of the torque/angle relationship. If it does not feel right, it probably isn't. If you stop there and check things out, you may save yourself a lot of grief.
If you are going to do the red Loctite job, then be ready to spend a little longer under the coach to clean things and juice the screws for the last assembly.
The practical matter is that properly tensioned fasteners do not get loose without something else going really wrong. So, if the job gets done right, it will be right. I think we have forty years of sample to prove that the joint works. This may be the only place that ethanol doesn't cause problems.
Break is over, back to reloading the new drive and hoping I can catch the other thing going out again.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
|
|
|
|
| Re: [GMCnet] Output shaft bolt size [message #225020 is a reply to message #225018] |
Wed, 09 October 2013 19:49 |
Jim Miller
Messages: 501
Registered: March 2008
Karma: 10
|
Senior Member |
|
|
On Oct 9, 2013, at 7:48 PM, Matt Colie wrote:
> Now, having been a fastener engineer, I can tell you that in a hard joint (no crushable gasket), it would take little to no rotation at all to loose a very serious amount of fastener tension.
Matt, thank you for pointing that out. It is something that I've intuitively known for some time and is precisely why I kept saying all through this thread that if they loosen any at all that they are at that point ineffective. The safety wire will arrest the rotation only AFTER that critical few degrees of loosening has occurred - and at that point there's simply no meaningful clamping force remaining so the bolt might have well as fallen out.
> I have to believe that the responsible engineer for that joint was counting on the developed friction.
Amen! There's no other way the joint can work!
> The practical matter is that properly tensioned fasteners do not get loose without something else going really wrong. So, if the job gets done right, it will be right. I think we have forty years of sample to prove that the joint works.
My belief is that those people who cannot keep their CV bolts in place without safety wire are having said problem because they are trying to assemble a joint that has experienced damage at some point in the past - most likely the threads in the driving flange are distorted - so even if they torque the fasteners to spec the distorted threads cannot provide the proper amount of anti-rotational friction thus they loosen up almost immediately. Safety wire only acts as a delay fuse for them.
Before attending college I worked at a machine shop that did a substantial amount of work on mineral processing machinery - multi-hundred horsepower hammer mills, rolling mills, ball mills and the like. I saw all sorts of large couplings that had been destroyed because of improper assembly - the mechanics at the mills thought they were more intelligent than the coupling engineers so they used incorrect fasteners, disregarded fastener torques, tried to weld bolt heads and coupling parts together among other things. When we went to the plants and put the equipment together to spec the stuff lasted as we did not second-guess the engineers that had designed the equipment.
--Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
|
|
|
|
| Re: [GMCnet] Output shaft bolt size [message #225023 is a reply to message #225018] |
Wed, 09 October 2013 20:00 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
|
Senior Member |
|
|
Matt,
Back in May of 2008 I posted an email entitled "Inner CV Joint to Final Drive Flange Bolts."
I did some testing of the OEM and Socket head bolts I got from the USA. I did a search for the title in the Forum but nothing was
found.
Anyone know how to find a link to that old a message?
Regards,
Rob M.
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Matt Colie
Sent: Wednesday, October 09, 2013 6:49 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Output shaft bolt size
Jim Miller wrote on Tue, 08 October 2013 20:56
> On Oct 8, 2013, at 8:15 PM, A. wrote:
>
> > Wired like this, how much can it loosen?
> > http://www.gmcmhphotos.com/photos/data/1/safetywired.jpg
Too Much - It needs to be done right!
Quote:
> I did some quick research and found that the axial clamping force of a 180000 psi 3/8"-24 fastener at 70 lb-ft of torque is right
around 10,000 lbs. This pressure is borne on the interface surface between the CV flange's bolt-hole perimeter and the surface under
the head of the bolt. If for whatever reason that tremendous amount of friction cannot keep the bolt from loosening then I do not
think a piece of 0.030 safety wire is going to stop it either - at least not for long.
>
> --Jim Miller
> 1977 Eleganza II
> 1977 Royale
> Hamilton, OH
I really didn't want to step into this thread just now. I have plenty to do recovering from the harddrive failure in my laptop and
the loss of a memory stick and something else (yet undiscovered) in my desktop system. So, I have been busy and annoyed for the
last three days.....
Now, having been a fastener engineer, I can tell you that in a hard joint (no crushable gasket), it would take little to no rotation
at all to loose a very serious amount of fastener tension. We used to do tension/rotation studies of hard joints all the time (like
mains and rods). I can assure you that the tension curve gets pretty near vertical at the design load.
Would safety wire help?
It wouldn't hurt, except that drilling (OK EDM) the head of that hard a fastener might well cause it to fail during tensioning.
And, you better learn to do the safety wire job correctly so it holds tension or it will be worse than a waste of time. (I learned
that trying to keep the drive axles on a 175hp Karman Ghia shaped "modified stock sedan" long before I even finished my first
bachelor's.)
Something else to be aware of.... The fasteners that McMaster-Carr has have a 3/8 12 point head and the OE parts are 7/16. So,
while you are ordering screws and washers, get the socket at the same time and carry them all in a plastic jar in your Oh-S... kit.
I have to believe that the responsible engineer for that joint was counting on the developed friction. Very simply, if he had been
counting on the shear strength of the fasteners, they would have had to be much larger and then there would also be the issue of
that same fastener embedding in the drive flange and distorting the threads.
Do they really have to be pulled to a tightening torque of 70#ft?
I would not want to do less, but when I have pulled mine up, I am trying to be very aware of the torque/angle relationship. If it
does not feel right, it probably isn't. If you stop there and check things out, you may save yourself a lot of grief.
If you are going to do the red Loctite job, then be ready to spend a little longer under the coach to clean things and juice the
screws for the last assembly.
The practical matter is that properly tensioned fasteners do not get loose without something else going really wrong. So, if the
job gets done right, it will be right. I think we have forty years of sample to prove that the joint works. This may be the only
place that ethanol doesn't cause problems.
Break is over, back to reloading the new drive and hoping I can catch the other thing going out again.
Matt
--
Matt & Mary Colie
'73 Glacier 23 Chaumière (say show-me-air)
Now with 4 working Rear Brakes
SE Michigan - Twixt A2 and Detroit
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
|
|
|
|
|
|
| Re: [GMCnet] Output shaft bolt size [message #225029 is a reply to message #225023] |
Wed, 09 October 2013 20:31 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
|
Senior Member |
|
|
Rob,
This is probably what you're looking for:
https://groups.google.com/forum/#!searchin/gmcnet-archive/Drive$20Flange$20Bolts%7Csort:relevance/gmcnet-archive/1s9HTwnOmMM/TlaseBJJhwAJ
Ken H.
On Wed, Oct 9, 2013 at 9:00 PM, Rob Mueller <robmueller@iinet.net.au> wrote:
> Matt,
>
> Back in May of 2008 I posted an email entitled "Inner CV Joint to Final
> Drive Flange Bolts."
>
> I did some testing of the OEM and Socket head bolts I got from the USA. I
> did a search for the title in the Forum but nothing was
> found.
>
> Anyone know how to find a link to that old a message?
>
> Regards,
> Rob M.
>
> -----Original Message-----
> From: gmclist-bounces@temp.gmcnet.org [mailto:
> gmclist-bounces@temp.gmcnet.org] On Behalf Of Matt Colie
> Sent: Wednesday, October 09, 2013 6:49 PM
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] Output shaft bolt size
>
>
>
> Jim Miller wrote on Tue, 08 October 2013 20:56
> > On Oct 8, 2013, at 8:15 PM, A. wrote:
> >
> > > Wired like this, how much can it loosen?
> > > http://www.gmcmhphotos.com/photos/data/1/safetywired.jpg
>
> Too Much - It needs to be done right!
> Quote:
> > I did some quick research and found that the axial clamping force of a
> 180000 psi 3/8"-24 fastener at 70 lb-ft of torque is right
> around 10,000 lbs. This pressure is borne on the interface surface between
> the CV flange's bolt-hole perimeter and the surface under
> the head of the bolt. If for whatever reason that tremendous amount of
> friction cannot keep the bolt from loosening then I do not
> think a piece of 0.030 safety wire is going to stop it either - at least
> not for long.
> >
> > --Jim Miller
> > 1977 Eleganza II
> > 1977 Royale
> > Hamilton, OH
>
> I really didn't want to step into this thread just now. I have plenty to
> do recovering from the harddrive failure in my laptop and
> the loss of a memory stick and something else (yet undiscovered) in my
> desktop system. So, I have been busy and annoyed for the
> last three days.....
>
> Now, having been a fastener engineer, I can tell you that in a hard joint
> (no crushable gasket), it would take little to no rotation
> at all to loose a very serious amount of fastener tension. We used to do
> tension/rotation studies of hard joints all the time (like
> mains and rods). I can assure you that the tension curve gets pretty near
> vertical at the design load.
>
> Would safety wire help?
> It wouldn't hurt, except that drilling (OK EDM) the head of that hard a
> fastener might well cause it to fail during tensioning.
> And, you better learn to do the safety wire job correctly so it holds
> tension or it will be worse than a waste of time. (I learned
> that trying to keep the drive axles on a 175hp Karman Ghia shaped
> "modified stock sedan" long before I even finished my first
> bachelor's.)
>
> Something else to be aware of.... The fasteners that McMaster-Carr has
> have a 3/8 12 point head and the OE parts are 7/16. So,
> while you are ordering screws and washers, get the socket at the same time
> and carry them all in a plastic jar in your Oh-S... kit.
>
> I have to believe that the responsible engineer for that joint was
> counting on the developed friction. Very simply, if he had been
> counting on the shear strength of the fasteners, they would have had to be
> much larger and then there would also be the issue of
> that same fastener embedding in the drive flange and distorting the
> threads.
>
> Do they really have to be pulled to a tightening torque of 70#ft?
> I would not want to do less, but when I have pulled mine up, I am trying
> to be very aware of the torque/angle relationship. If it
> does not feel right, it probably isn't. If you stop there and check
> things out, you may save yourself a lot of grief.
>
> If you are going to do the red Loctite job, then be ready to spend a
> little longer under the coach to clean things and juice the
> screws for the last assembly.
>
> The practical matter is that properly tensioned fasteners do not get loose
> without something else going really wrong. So, if the
> job gets done right, it will be right. I think we have forty years of
> sample to prove that the joint works. This may be the only
> place that ethanol doesn't cause problems.
>
> Break is over, back to reloading the new drive and hoping I can catch the
> other thing going out again.
>
> Matt
> --
> Matt & Mary Colie
> '73 Glacier 23 Chaumière (say show-me-air)
> Now with 4 working Rear Brakes
> SE Michigan - Twixt A2 and Detroit
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
|
|
|
|
|
|
| Re: [GMCnet] Output shaft bolt size [message #225034 is a reply to message #225030] |
Wed, 09 October 2013 20:53 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
|
Senior Member |
|
|
I safety wire propellers and oil filters, among other things, on airplanes.
I have never had one come loose in flight yet.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
|
|
|
|
| Re: [GMCnet] Output shaft bolt size [message #225036 is a reply to message #225030] |
Wed, 09 October 2013 21:02 |
Jp Benson
Messages: 649
Registered: October 2011
Location: Fla
Karma: 2
|
Senior Member |
|
|
Sorry to hear about Matt's computer. His reply begs one of my original questions. Why is there a 7/16+ hole for a 3/8 bolt. This arrangement reduces the surface area available for the "developed friction" that the engineer for that joint was counting on. By about 20%.
JP
On Wednesday, October 9, 2013 9:41 PM, A. <markbb1@netzero.com> wrote:
>
>Robert Mueller wrote on Wed, 09 October 2013 20:08
>> Gentlemen,
>>
>> Please look at the link to the photo I posted of correct safety wiring procedure and explain to me how a bolt can turn at all if it is safety wired as per that photo and the safety wire is tight?
>>
>> Regards,
>> Rob M.
>Jim Miller wrote on Tue, 08 October 2013 19:56
>> I did some quick research and found that the axial clamping force of a 180000 psi 3/8"-24 fastener at 70 lb-ft of torque is right around 10,000 lbs. This pressure is borne on the interface surface between the CV flange's
bolt-hole perimeter
and the surface under the head of the bolt. If for whatever reason that tremendous amount of friction cannot keep the bolt from loosening then I do not think a piece of 0.030 safety wire is going to stop it either - at least not for long.
>>
>> --Jim Miller
>> 1977 Eleganza II
>> 1977 Royale
>> Hamilton, OH
>Interesting discussion.
>--
>'73 23' Sequoia For Sale
>'73 23' CanyonLands For Sale
>UA (Upper Alabama)
>CanyonLands most likely for a parts coach. Sequoia being restored to service.
>
>_______________________________________________
>GMCnet mailing list
>Unsubscribe or Change List Options:
>http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
>
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: [GMCnet] Output shaft bolt size [message #225060 is a reply to message #225024] |
Thu, 10 October 2013 09:42 |
GMC_LES
Messages: 569
Registered: October 2009
Location: Montreal
Karma: 0
|
Senior Member |
|
|
Rob,
You suffering from CRS again?
I'm sure you know this based on your previous employment.
If you have played with lock-wire long enough you will have already discovered that the easy stuff to work with is quite soft. There are a varying assortment of wire specs out there and some of them are very stiff, making them prone to breaking if twisted or bent too tight. The most popular lock-wire among most techs is the soft stuff. The point here is that the softer wire will allow more stretch when put under tension, allowing some fastener rotation. Employing the stiffer wire may reduce stretch, but increases the risk of wire failure due to work hardening at any bend of the wire.
Most aviation manufacturers have a specific spec stated in their manuals regarding what lock-wire to use. In rare situations It can actually vary depending on location, environment, etc. in such situations, techs can unknowingly use the same spec wire throughout a job.
An example of two extremes might be flight control fasteners which see cool temps & low harmonics Versus an exhaust jet pipe which sees high temps and high harmonics. The specs may also come from different manufacturers as most aircraft use a variety of different sources.
I think I've dragged this topic far enough off topic now.
Lets see what is said about the 7/16 bolt hole size.
Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
On Oct 9, 2013, at 9:08 PM, "Rob Mueller" <robmueller@iinet.net.au> wrote:
> Gentlemen,
>
> Please look at the link to the photo I posted of correct safety wiring procedure and explain to me how a bolt can turn at all if it
> is safety wired as per that photo and the safety wire is tight?
>
> Regards,
> Rob M.
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
|
|
|
|
| Re: [GMCnet] Output shaft bolt size [message #225061 is a reply to message #225060] |
Thu, 10 October 2013 09:54 |
|
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
|
Senior Member |
|
|
Les,
To make sure I've got it right in your opinion the inner CV joint bolts torqued to 75 ft lb as per the MM and safety wired properly
with 0.032 stainless steel safety wire can turn allowing the bolt to loosen?
Regards,
Rob M.
-----Original Message-----
From: Les Burt
Rob,
You suffering from CRS again?
I'm sure you know this based on your previous employment.
If you have played with lock-wire long enough you will have already discovered that the easy stuff to work with is quite soft. There
are a varying assortment of wire specs out there and some of them are very stiff, making them prone to breaking if twisted or bent
too tight. The most popular lock-wire among most techs is the soft stuff. The point here is that the softer wire will allow more
stretch when put under tension, allowing some fastener rotation. Employing the stiffer wire may reduce stretch, but increases the
risk of wire failure due to work hardening at any bend of the wire.
Most aviation manufacturers have a specific spec stated in their manuals regarding what lock-wire to use. In rare situations It can
actually vary depending on location, environment, etc. in such situations, techs can unknowingly use the same spec wire throughout
a job.
An example of two extremes might be flight control fasteners which see cool temps & low harmonics Versus an exhaust jet pipe which
sees high temps and high harmonics. The specs may also come from different manufacturers as most aircraft use a variety of
different sources.
I think I've dragged this topic far enough off topic now.
Lets see what is said about the 7/16 bolt hole size.
Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
|
|
|
|
| Re: [GMCnet] Output shaft bolt size [message #225062 is a reply to message #225061] |
Thu, 10 October 2013 10:04 |
Gary Worobec
Messages: 867
Registered: May 2005
Karma: -1
|
Senior Member |
|
|
Hi,
When I did my 1 ton from Manny I bought new 12 point bolts from
McMaster-Carr. They are right on the limit at 75 ft lbs. I actually snapped
two and then backed off the torque wrench to 70 ft lbs. I think it is most
important to use the proper heavy duty lock washer and red LOCTITE with the
bolts. My torque wrench is a decent Craftsman "clicker" so it might have
been off a bit. Fortunately when the bolts snap they are easy to get out
with pliers.
Thanks,
Gary and Joanne Worobec
1973 GMC Glacier
Anza, CA
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Rob Mueller
Sent: Thursday, October 10, 2013 7:54 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Output shaft bolt size
Les,
To make sure I've got it right in your opinion the inner CV joint bolts
torqued to 75 ft lb as per the MM and safety wired properly with 0.032
stainless steel safety wire can turn allowing the bolt to loosen?
Regards,
Rob M.
-----Original Message-----
From: Les Burt
Rob,
You suffering from CRS again?
I'm sure you know this based on your previous employment.
If you have played with lock-wire long enough you will have already
discovered that the easy stuff to work with is quite soft. There are a
varying assortment of wire specs out there and some of them are very stiff,
making them prone to breaking if twisted or bent too tight. The most popular
lock-wire among most techs is the soft stuff. The point here is that the
softer wire will allow more stretch when put under tension, allowing some
fastener rotation. Employing the stiffer wire may reduce stretch, but
increases the risk of wire failure due to work hardening at any bend of the
wire.
Most aviation manufacturers have a specific spec stated in their manuals
regarding what lock-wire to use. In rare situations It can actually vary
depending on location, environment, etc. in such situations, techs can
unknowingly use the same spec wire throughout a job.
An example of two extremes might be flight control fasteners which see cool
temps & low harmonics Versus an exhaust jet pipe which sees high temps and
high harmonics. The specs may also come from different manufacturers as
most aircraft use a variety of different sources.
I think I've dragged this topic far enough off topic now.
Lets see what is said about the 7/16 bolt hole size.
Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: [GMCnet] Output shaft bolt size [message #225063 is a reply to message #225062] |
Thu, 10 October 2013 10:31 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
|
Senior Member |
|
|
Gary you should check the calibration of that nice craftsman wrench. I sent my craftsman in for calibration back when I was working cause it was way out of calibration. A friend was tightening his head bolts on a ford a few years ago with his craftsman I could see he was pulling too hard on the wrench it was 50lbs out. The trick is to remember to set it back to zero after each use.
Roy Keen
Minden,NV
76 X Glenbrook
|
|
|
|
|
|
|
|
|
|
Goto Forum:
Current Time: Sat Oct 05 22:59:26 CDT 2024
Total time taken to generate the page: 0.01305 seconds
|
GMCforum
Search
Help
Register
Login
Home
