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top engine case bolts

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indigoonlatigo(at)msn.com
Guest

Posted: Sat Jan 23, 2010 7:05 pm Post subject: top engine case bolts

I was attaching the front and aft baffle brackets to the top of the engine case. These bolts are 7/16 diameter coarse thread. 

  

 The question I have is one C why are they undersize for the hole which they fill C second C why are they coarse thread C lastly C what is the torque value. I have the lycoming torque value pages that were put on this forum C but I couldn't find the specification for these bolts. 

  

 Regular value for a 7/16 is 50 LB/Ft. I snapped the first bolt I tried to tighten. I am believing that these bolts are very special and must be designed for expansion. 

  

 Anyone have the answers and another source or will I need to call Lycoming to order another bolt and get the torque value from them. 

  

 Thanks C

  

 JOhn 

 		 	   		    [quote][b]

Kelly McMullen

Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ

Posted: Sat Jan 23, 2010 8:01 pm Post subject: top engine case bolts

Looks like the parts manual calls for LW25 in varying lengths for all

the parting line bolts, which is 1/4" bolt X20 pitch thread. The

manual calls for 75 INCH pounds. Not sure where you are finding 7/16

diameter bolts other than for the alternator mounting.

You can get engine bolts from most parts suppliers.



On Sat, Jan 23, 2010 at 8:02 PM, John Gonzalez <indigoonlatigo(at)msn.com> wrote:

 	  Quote: 	
		   I was attaching the front and aft baffle brackets to the top of the engine

 case. These bolts are 7/16 diameter coarse thread.



 The question I have is one, why are they undersize for the hole which they

 fill, second, why are they coarse thread, lastly, what is the torque value.

 I have the lycoming torque value pages that were put on this forum, but I

 couldn't find the specification for these bolts.



 Regular value for a 7/16 is 50 LB/Ft. I snapped the first bolt I tried to

 tighten. I am believing that these bolts are very special and must be

 designed for expansion.



 Anyone have the answers and another source or will I need to call Lycoming

 to order another bolt and get the torque value from them.



 Thanks,



 JOhn

_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor
KCHD

indigoonlatigo(at)msn.com
Guest

Posted: Sat Jan 23, 2010 8:18 pm Post subject: top engine case bolts

Thanks that's about everything I need

  

 Appreciate it.

  

 DO Not archive

 

 	  Quote: 	
		   Date: Sat C 23 Jan 2010 20:59:13 -0700

 Subject: Re: top engine case bolts

 From: apilot2(at)gmail.com

 To: rv10-list(at)matronics.com

 

 --> RV10-List message posted by: Kelly McMullen <apilot2(at)gmail.com>

 

 Looks like the parts manual calls for LW25 in varying lengths for all

 the parting line bolts C which is 1/4" bolt X20 pitch thread. The

 manual calls for 75 INCH pounds. Not sure where you are finding 7/16

 diameter bolts other than for the alternator mounting.

 You can get engine bolts from most parts suppliers.

 

 On Sat C Jan 23 C 2010 at 8:02 PM C John Gonzalez <indigoonlatigo(at)msn.com> wrote:

 > I was attaching the front and aft baffle brackets to the top of the engine

 > case. These bolts are 7/16 diameter coarse thread.

 >

 > The question I have is one C why are they undersize for the hole which they

 > fill C second C why are they coarse thread C lastly C what is the torque value.

 > I have the lycoming torque value pages that were put on this forum C but I

 > couldn't find the specification for these bolts.

 >

 > Regular value for a 7/16 is 50 LB/Ft. I snapped the first bolt I tried to

 > tighten. I am believing that these bolts are very special and must be

 > designed for expansion.

 >

 > Anyone have the answers and another source or will I need to call Lycoming

 > to order another bolt and get the torque value from them.

 >

 > Thanks C

 >

 > JOhn

 >

 >

 >

&gt===================
	


[quote] 

 

 

 		 	   		     	  Quote: 	
		  [b]

n801bh(at)netzero.com
Guest

Posted: Sat Jan 23, 2010 8:26 pm Post subject: top engine case bolts

Ya know. I think he is assuming the head size of the bolt, 7/16" is the bolt size. A 1/4" bolt has a socket/wrench size of 7/16..... No wonder it broke at 50 ft lbs.

Ben Haas

N801BH

www.haaspowerair.com



--------

Kelly McMullen

Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ

Posted: Sat Jan 23, 2010 8:49 pm Post subject: top engine case bolts

If you haven't already, I suggest downloading the parts and overhaul

manual from Tim's site.

The bolts are on page 1-13 for the case parting line.



On Sat, Jan 23, 2010 at 9:16 PM, John Gonzalez <indigoonlatigo(at)msn.com> wrote:

 	  Quote: 	
		   Thanks that's about everything I need



 Appreciate it.



 DO Not archive



> Date: Sat, 23 Jan 2010 20:59:13 -0700

> Subject: Re: top engine case bolts

> From: apilot2(at)gmail.com

> To: rv10-list(at)matronics.com

>

> 

>

> Looks like the parts manual calls for LW25 in varying lengths for all

> the parting line bolts, which is 1/4" bolt X20 pitch thread. The

> manual calls for 75 INCH pounds. Not sure where you are finding 7/16

> diameter bolts other than for the alternator mounting.

> You can get engine bolts from most parts suppliers.

>

> On Sat, Jan 23, 2010 at 8:02 PM, John Gonzalez <indigoonlatigo(at)msn.com>

> wrote:

> > I was attaching the front and aft baffle brackets to the top of the

> > engine

> > case. These bolts are 7/16 diameter coarse thread.

> >

> > The question I have is one, why are they undersize for the hole which

> > they

> > fill, second, why are they coarse thread, lastly, what is the torque

> > value.

> > I have the lycoming torque value pages that were put on this forum, but

> > I

> > couldn't find the specification for these bolts.

> >

> > Regular value for a 7/16 is 50 LB/Ft. I snapped the first bolt I tried

> > to

> > tighten. I am believing that these bolts are very special and must be

> > designed for expansion.

> >

> > Anyone have the answers and another source or will I need to call

> > Lycoming

> > to order another bolt and get the torque value from them.

> >

> > Thanks,

> >

> > JOhn

> >

> >

> >

 &gt===================

>

_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor
KCHD

indigoonlatigo(at)msn.com
Guest

Posted: Sat Jan 23, 2010 8:58 pm Post subject: top engine case bolts

I was about to make that admission C what was I thinking

  From: n801bh(at)netzero.com

Date: Sun C 24 Jan 2010 04:22:43 +0000

To: rv10-list(at)matronics.com

Subject: Re: top engine case bolts

Ya know. I think he is assuming the head size of the bolt C 7/16" is the bolt size. A 1/4" bolt has a socket/wrench size of 7/16..... No wonder it broke at 50 ft lbs.

Ben Haas

N801BH

www.haaspowerair.com

--------

n801bh(at)netzero.com
Guest

Posted: Sat Jan 23, 2010 9:12 pm Post subject: top engine case bolts

For penance you need to say 2 our fathers, 3 hail mary's and log 2.4 PIC in the next two weeks. By doing that you will stay out purgatory... Or filling out FAA form 75747, which is alot worse then hell. <GG> 

do not archive

Ben Haas

N801BH

www.haaspowerair.com



--------

indigoonlatigo(at)msn.com
Guest

Posted: Sat Jan 23, 2010 9:40 pm Post subject: top engine case bolts

Actually what is better is to retrace the thought process which led me down that path so that it doesn't happen again. 

  

 The repetitive nature of constructing the baffles lulled me into stupidity. Without plans to callout the size of the bolt C as is done with the building plans C my mind went into dumb mode.

  

  

  

  

  

  From: n801bh(at)netzero.com

Date: Sun C 24 Jan 2010 05:08:16 +0000

To: rv10-list(at)matronics.com

Subject: RE: top engine case bolts



 For penance you need to say 2 our fathers C 3 hail mary's and log 2.4 PIC in the next two weeks. By doing that you will stay out purgatory... Or filling out FAA form 75747 C which is alot worse then hell. <GG>

 do not archive

Ben Haas

N801BH

www.haaspowerair.com



--------

indigoonlatigo(at)msn.com
Guest

Posted: Sat Jan 23, 2010 9:43 pm Post subject: top engine case bolts

Where is it? 

  

 That good stuff used to be in the builders only section. I can't find that section anymore

  

 Thanks

  

 JOhn 

 

 	  Quote: 	
		   Date: Sat C 23 Jan 2010 21:46:52 -0700

 Subject: Re: top engine case bolts

 From: apilot2(at)gmail.com

 To: rv10-list(at)matronics.com

 

 --> RV10-List message posted by: Kelly McMullen <apilot2(at)gmail.com>

 

 If you haven't already C I suggest downloading the parts and overhaul

 manual from Tim's site.

 The bolts are on page 1-13 for the case parting line.

 

 On Sat C Jan 23 C 2010 at 9:16 PM C John Gonzalez <indigoonlatigo(at)msn.com> wrote:

 > Thanks that's about everything I need

 >

 > Appreciate it.

 >

 > DO Not archive

 >

 >> Date: Sat C 23 Jan 2010 20:59:13 -0700

 >> Subject: Re: RV10-List: top engine case bolts

 >> From: apilot2(at)gmail.com

 >> To: rv10-list(at)matronics.com

 >>

 >> --> RV10-List message posted by: Kelly McMullen <apilot2(at)gmail.com>

 >>

 >> Looks like the parts manual calls for LW25 in varying lengths for all

 >> the parting line bolts C which is 1/4" bolt X20 pitch thread. The

 >> manual calls for 75 INCH pounds. Not sure where you are finding 7/16

 >> diameter bolts other than for the alternator mounting.

 >> You can get engine bolts from most parts suppliers.

 >>

 >> On Sat C Jan 23 C 2010 at 8:02 PM C John Gonzalez <indigoonlatigo(at)msn.com>

 >> wrote:

 >> > I was attaching the front and aft baffle brackets to the top of the

 >> > engine

 >> > case. These bolts are 7/16 diameter coarse thread.

 >> >

 >> > The question I have is one C why are they undersize for the hole which

 >> > they

 >> > fill C second C why are they coarse thread C lastly C what is the torque

 >> > value.

 >> > I have the lycoming torque value pages that were put on this forum C but

 >> > I

 >> > couldn't find the specification for these bolts.

 >> >

 >> > Regular value for a 7/16 is 50 LB/Ft. I snapped the first bolt I tried

 >> > to

 >> > tighten. I am believing that these bolts are very special and must be

 >> > designed for expansion.

 >> >

 >> > Anyone have the answers and another source or will I need to call

 >> > Lycoming

 >> > to order another bolt and get the torque value from them.

 >> >

 >> > Thanks C

 >> >

 >> > JOhn

 >> >

 >> >

 >> >

 > &gt===================

 >>

 >>

 >>

 >

 >

 >

 >

&gt==============
	


[quote] 

 

 

 		 	   		     	  Quote: 	
		  [b]

Tim Olson

Joined: 25 Jan 2007
Posts: 2879

Posted: Sat Jan 23, 2010 10:13 pm Post subject: top engine case bolts

I replied offline.



Tim Olson - RV-10 N104CD

do not archive

John Gonzalez wrote:

 	  Quote: 	
		   Where is it?

  

 That good stuff used to be in the builders only section. I can't find 

 that section anymore

  

 Thanks

  

 JOhn 

  

  > Date: Sat, 23 Jan 2010 21:46:52 -0700

  > Subject: Re: top engine case bolts

  > From: apilot2(at)gmail.com

  > To: rv10-list(at)matronics.com

  >

  > 

  >

  > If you haven't already, I suggest downloading the parts and overhaul

  > manual from Tim's site.

  > The bolts are on page 1-13 for the case parting line.

  >

  > On Sat, Jan 23, 2010 at 9:16 PM, John Gonzalez 

 <indigoonlatigo(at)msn.com> wrote:

  > > Thanks that's about everything I need

  > >

  > > Appreciate it.

  > >

  > > DO Not archive

  > >

  > >> Date: Sat, 23 Jan 2010 20:59:13 -0700

  > >> Subject: Re: top engine case bolts

  > >> From: apilot2(at)gmail.com

  > >> To: rv10-list(at)matronics.com

  > >>

  > >> 

  > >>

  > >> Looks like the parts manual calls for LW25 in varying lengths for all

  > >> the parting line bolts, which is 1/4" bolt X20 pitch thread. The

  > >> manual calls for 75 INCH pounds. Not sure where you are finding 7/16

  > >> diameter bolts other than for the alternator mounting.

  > >> You can get engine bolts from most parts suppliers.

  > >>

  > >> On Sat, Jan 23, 2010 at 8:02 PM, John Gonzalez 

 <indigoonlatigo(at)msn.com>

  > >> wrote:

  > >> > I was attaching the front and aft baffle brackets to the top of the

  > >> > engine

  > >> > case. These bolts are 7/16 diameter coarse thread.

  > >> >

  > >> > The question I have is one, why are they undersize for the hole 

 which

  > >> > they

  > >> > fill, second, why are they coarse thread, lastly, what is the torque

  > >> > value.

  > >> > I have the lycoming torque value pages that were put on this 

 forum, but

  > >> > I

  > >> > couldn't find the specification for these bolts.

  > >> >

  > >> > Regular value for a 7/16 is 50 LB/Ft. I snapped the first bolt I 

 tried

  > >> > to

  > >> > tighten. I am believing that these bolts are very special and 

 must be

  > >> > designed for expansion.

  > >> >

  > >> > Anyone have the answers and another source or will I need to call

  > >> > Lycoming

  > >> > to order another bolt and get the torque value from them.

  > >> >

  > >> > Thanks,

  > >> >

  > >> > JOhn

  > >> >

  > >> >

  > >> >

  > > &gt===================

  > >>

  > >>

  > >>

  > >

  > >

  > >

  > >

  >==============

  >

  >

  >

 

 *

 

 

 *

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