[DeTomaso] Fwd: Re: Oil Leak Fixed. What Torque?
Joseph F. Byrd, Jr.
byrdjf at embarqmail.com
Thu Sep 29 00:50:28 EDT 2016
Well, I have been known to provide answers with gross errors just to see if any one actually cares.
I just plugged the bolt sizes into calc sheet I had used for other gasketed joints. But as a sanity check here is a generic torque/clamping load chart for small bolts including ¼ 20
http://www.spaenaur.com/pdf/sectionD/D48.pdf
Joe/5177
From: Guido deTomaso [mailto:guido_detomaso at prodigy.net]
Sent: Thursday, September 29, 2016 0:03 AM
To: Joseph F. Byrd, Jr.; detomaso at server.detomasolist.com
Subject: Re: [DeTomaso] Fwd: Re: Oil Leak Fixed. What Torque?
Late to the party but I can't believe the sheet metal valve covers are "pushing down" with ~4.5 tons of force. Visualize lifting a 4.5 ton vehicle off the ground by one valve cover ( hook a hoist to the oil filler hole ? )
I mean, come on.
GD
_____
From: "Joseph F. Byrd, Jr." <byrdjf at embarqmail.com>
To: detomaso at server.detomasolist.com
Sent: Wednesday, September 14, 2016 8:32 PM
Subject: Re: [DeTomaso] Fwd: Re: Oil Leak Fixed. What Torque?
Not something I worked with, BUT
Assuming the valve cover gasket has an effective diameter of 23” and 0.3”
wide.
Using neoprene cork with 30% compression at 400 psi loading
The torque to provide 30% compression would be 4.7 ft-lbs.
Given the gasket will be compressing as the next bolt is tighten, several
passes at desired torque till no rotation would be needed.
Each of the 8 bolts would be pushing down 1,100 lbf for a total of 8,900 lbf
per valve cover
The “normal” ¼-20 torque resulting in a bolt loading of 45Kpsi (high grade
bolt) would be 6.3 ft-lbs
Sort of a rule of thumb I have observed, If allen, using a long key with the
short arm for torquing, using the thumb and index finger only provides the
max torque
Sorry for my ramblings,
Joe
-----Original Message-----
From: DeTomaso [mailto:detomaso-bounces at server.detomasolist.com] On Behalf
Of Joseph F. Byrd, Jr.
Sent: Wednesday, September 14, 2016 20:01 PM
To: 'detomasolist'
Subject: Re: [DeTomaso] Fwd: Re: Oil Leak Fixed. What Torque?
I haven't been able to find on line, so if someone knows the dimensions of a
valve cover gasket (length, width, width) I would appreciate.
I am now curious and need to calculate!
BTW, 10ft-lbs just for a 1/4-20 seems pretty high. That should have the
bolt torque sufficient to prevent backing off (once retorqued after gasket
relaxed)
-----Original Message-----
From: DeTomaso [mailto:detomaso-bounces at server.detomasolist.com] On Behalf
Of Dave Londry
Sent: Wednesday, September 14, 2016 19:24 PM
To: detomasolist
Subject: [DeTomaso] Fwd: Re: Oil Leak Fixed. What Torque?
My collection of other peoples Torque info, these 2 agree at 10 ft.lb.
Needs a 1/4 drive torque wrench - you're in the weeds with the tension
spring fully unwound if you use 3/8.
(I have a bunch nor added yet - another roundtuit job)
Dave
On 2016-09-14 12:36 PM, Himes, Terry (397C) wrote:
> Hey Pantera Guru's,
> I finally got to my Pantera last night. (work is getting in the way of
> my fun!!)
> Simple fix. ALL my valve cover bolts were loose. Every one of them.
> I tightened them all
> but didn't want to over tighten them. Anyone know what the correct
> torque should be?
> I have roller rockers and the taller Ford Racing valve covers for
> clearance.
> Your thoughts?
> Terry
>
> "A Purple Heart proves you were smart enough to hatch a plan,
>
> stupid enough to try it and lucky enough to survive!"
>
> Terry W. Himes
>
> JPL Jet Propulsion Laboratory
>
> Dawn Spacecraft Team
>
> Rosetta Sequence Team Lead
>
> Phone: (818) 393-6261
>
> Cell: (818) 653-8213
>
> Fax: (818) 393-3147
>
> [1]thimes at jpl.nasa.gov
>
> References
>
> 1.mailto:thimes at jpl.nasa.gov
>
>
>
> _______________________________________________
>
>
> Detomaso Email List is not managed by POCA Posted emails must not
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>
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They also grant the list owner permission to maintain an archive or approve
the archiving of list messages.
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-------------- next part --------------
Well, I have been known to provide answers with gross errors just to
see if any one actually cares.
I just plugged the bolt sizes into calc sheet I had used for other
gasketed joints. But as a sanity check here is a generic
torque/clamping load chart for small bolts including 1/4 20
http://www.spaenaur.com/pdf/sectionD/D48.pdf
Joe/5177
From: Guido deTomaso [mailto:guido_detomaso at prodigy.net]
Sent: Thursday, September 29, 2016 0:03 AM
To: Joseph F. Byrd, Jr.; detomaso at server.detomasolist.com
Subject: Re: [DeTomaso] Fwd: Re: Oil Leak Fixed. What Torque?
Late to the party but I can't believe the sheet metal valve covers are
"pushing down" with ~4.5 tons of force. Visualize lifting a 4.5 ton
vehicle off the ground by one valve cover ( hook a hoist to the oil
filler hole ? )
I mean, come on.
GD
_______________________________________________________________________
From: "Joseph F. Byrd, Jr." <[1]byrdjf at embarqmail.com>
To: [2]detomaso at server.detomasolist.com
Sent: Wednesday, September 14, 2016 8:32 PM
Subject: Re: [DeTomaso] Fwd: Re: Oil Leak Fixed. What Torque?
Not something I worked with, BUT
Assuming the valve cover gasket has an effective diameter of 23" and
0.3"
wide.
Using neoprene cork with 30% compression at 400 psi loading
The torque to provide 30% compression would be 4.7 ft-lbs.
Given the gasket will be compressing as the next bolt is tighten,
several
passes at desired torque till no rotation would be needed.
Each of the 8 bolts would be pushing down 1,100 lbf for a total of
8,900 lbf
per valve cover
The "normal" 1/4-20 torque resulting in a bolt loading of 45Kpsi (high
grade
bolt) would be 6.3 ft-lbs
Sort of a rule of thumb I have observed, If allen, using a long key
with the
short arm for torquing, using the thumb and index finger only provides
the
max torque
Sorry for my ramblings,
Joe
-----Original Message-----
From: DeTomaso [mailto:[3]detomaso-bounces at server.detomasolist.com] On
Behalf
Of Joseph F. Byrd, Jr.
Sent: Wednesday, September 14, 2016 20:01 PM
To: 'detomasolist'
Subject: Re: [DeTomaso] Fwd: Re: Oil Leak Fixed. What Torque?
I haven't been able to find on line, so if someone knows the dimensions
of a
valve cover gasket (length, width, width) I would appreciate.
I am now curious and need to calculate!
BTW, 10ft-lbs just for a 1/4-20 seems pretty high. That should have
the
bolt torque sufficient to prevent backing off (once retorqued after
gasket
relaxed)
-----Original Message-----
From: DeTomaso [mailto:[4]detomaso-bounces at server.detomasolist.com] On
Behalf
Of Dave Londry
Sent: Wednesday, September 14, 2016 19:24 PM
To: detomasolist
Subject: [DeTomaso] Fwd: Re: Oil Leak Fixed. What Torque?
My collection of other peoples Torque info, these 2 agree at 10 ft.lb.
Needs a 1/4 drive torque wrench - you're in the weeds with the tension
spring fully unwound if you use 3/8.
(I have a bunch nor added yet - another roundtuit job)
Dave
On 2016-09-14 12:36 PM, Himes, Terry (397C) wrote:
> Hey Pantera Guru's,
> I finally got to my Pantera last night. (work is getting in the
way of
> my fun!!)
> Simple fix. ALL my valve cover bolts were loose. Every one of
them.
> I tightened them all
> but didn't want to over tighten them. Anyone know what the
correct
> torque should be?
> I have roller rockers and the taller Ford Racing valve covers for
> clearance.
> Your thoughts?
> Terry
>
> "A Purple Heart proves you were smart enough to hatch a plan,
>
> stupid enough to try it and lucky enough to survive!"
>
> Terry W. Himes
>
> JPL Jet Propulsion Laboratory
>
> Dawn Spacecraft Team
>
> Rosetta Sequence Team Lead
>
> Phone: (818) 393-6261
>
> Cell: (818) 653-8213
>
> Fax: (818) 393-3147
>
> [1][5]thimes at jpl.nasa.gov
>
> References
>
> 1.mailto:[6]thimes at jpl.nasa.gov
>
>
>
> _______________________________________________
>
>
> Detomaso Email List is not managed by POCA Posted emails must not
> exceed 1.5 Megabytes DeTomaso mailing list
> [7]DeTomaso at server.detomasolist.com
> [8]http://server.detomasolist.com/mailman/listinfo/detomaso
>
> To manage your subscription (change email address, unsubscribe, etc.)
> use
the links above.
>
> Members who post to this list grant license to the list to forward
any
message posted here to all past, current, or future members of the
list.
They also grant the list owner permission to maintain an archive or
approve
the archiving of list messages.
_______________________________________________
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use
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list.
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the archiving of list messages.
_______________________________________________
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References
1. mailto:byrdjf at embarqmail.com
2. mailto:detomaso at server.detomasolist.com
3. mailto:detomaso-bounces at server.detomasolist.com
4. mailto:detomaso-bounces at server.detomasolist.com
5. mailto:thimes at jpl.nasa.gov
6. mailto:thimes at jpl.nasa.gov
7. mailto:DeTomaso at server.detomasolist.com
8. http://server.detomasolist.com/mailman/listinfo/detomaso
9. mailto:DeTomaso at server.detomasolist.com
10. http://server.detomasolist.com/mailman/listinfo/detomaso
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