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bwestfall
Joined: 22 Oct 2008
Posts: 131
Location: Portland, OR
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 Posted: Fri Mar 07, 2014 11:26 am Post subject: C4B5 missing boss mount hole |
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I’m using an IO-540 C4B5 off of an Aztec that’s built up as a dummy core for now so I can do the initial cowl and baffling work. The case halves are the actual ones that will be used on final re-assembly of the motor. The issue I’m seeing is a missing boss mount hole for the CB-1002E fwd left support bracket that backs the fwd left air ramp baffling. Has anyone that’s used a C4B5 ran into this? I presume the hole can be carefully located and drilled and tapped but thought I’d ask the brain trust. See attached photos.
Ben Westfall
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bcondrey
Joined: 03 Apr 2006
Posts: 580
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| Posted: Fri Mar 07, 2014 11:45 am Post subject: C4B5 missing boss mount hole |
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Yes, I had that on the engine of my first RV-10. My solution was to make a replacement bracket to fit a hole outboard of what was shown in the plans. Picture (fuzzy) attached to give you an idea of what I did. Never heard of anybody else having this issue so I just made a replacement out of 3/4 angle and moved on. Hope this helps.
Â
Bob
On Fri, Mar 7, 2014 at 2:25 PM, Ben Westfall <rv10(at)sinkrate.com (rv10(at)sinkrate.com)> wrote:
| Quote: |
I’m using an IO-540 C4B5 off of an Aztec that’s built up as a dummy core for now so I can do the initial cowl and baffling work. The case halves are the actual ones that will be used on final re-assembly of the motor. The issue I’m seeing is a missing boss mount hole for the CB-1002E fwd left support bracket that backs the fwd left air ramp baffling. Has anyone that’s used a C4B5 ran into this? I presume the hole can be carefully located and drilled and tapped but thought I’d ask the brain trust. See attached photos.
Â
Ben Westfall
Â
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http://www.matronics.com/Navigator?RV10-List |
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Jim Combs
Joined: 24 Jan 2010
Posts: 140
Location: Lexington, Ky
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| Posted: Fri Mar 07, 2014 11:54 am Post subject: C4B5 missing boss mount hole |
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I also have a C4B5, also missing mounting hole and did the same thing. It's an opportunity to make a part (Fit).
Jim Combs
On Fri, Mar 7, 2014 at 2:44 PM, Bob Condrey <condreyb(at)gmail.com (condreyb(at)gmail.com)> wrote:
[quote] Yes, I had that on the engine of my first RV-10. My solution was to make a replacement bracket to fit a hole outboard of what was shown in the plans. Picture (fuzzy) attached to give you an idea of what I did. Never heard of anybody else having this issue so I just made a replacement out of 3/4 angle and moved on. Hope this helps.
Bob
On Fri, Mar 7, 2014 at 2:25 PM, Ben Westfall <rv10(at)sinkrate.com (rv10(at)sinkrate.com)> wrote:
| Quote: |
I’m using an IO-540 C4B5 off of an Aztec that’s built up as a dummy core for now so I can do the initial cowl and baffling work. The case halves are the actual ones that will be used on final re-assembly of the motor. The issue I’m seeing is a missing boss mount hole for the CB-1002E fwd left support bracket that backs the fwd left air ramp baffling. Has anyone that’s used a C4B5 ran into this? I presume the hole can be carefully located and drilled and tapped but thought I’d ask the brain trust. See attached photos.
Ben Westfall
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[b]
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_________________
RV-10 -> N312F - Flying as of 12/2008 |
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flying-nut(at)cfl.rr.com
Guest
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| Posted: Fri Mar 07, 2014 11:56 am Post subject: C4B5 missing boss mount hole |
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Bummer. My fellow RV-10 builder found a similar 'flaw' on his case. He elected to drill/tap ..... and found the bottom of the hole isn't far from the inside of the case!!! He'll have to seal that screw well. However, it appears that the 'hole' in your picture is far larger than the screw. I'd clean out the hole real good, fill the hole with JB Weld, re-drill/tap. Use Locktite on final assembly.
Linn
IMHO, of course!!!
On 3/7/2014 2:25 PM, Ben Westfall wrote:
[quote] <![endif]--> <![endif]-->
I’m using an IO-540 C4B5 off of an Aztec that’s built up as a dummy core for now so I can do the initial cowl and baffling work. The case halves are the actual ones that will be used on final re-assembly of the motor. The issue I’m seeing is a missing boss mount hole for the CB-1002E fwd left support bracket that backs the fwd left air ramp baffling. Has anyone that’s used a C4B5 ran into this? I presume the hole can be carefully located and drilled and tapped but thought I’d ask the brain trust. See attached photos.
Ben Westfall
No virus found in this message.
Checked by AVG - www.avg.com
03/07/14 [b]
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bwestfall
Joined: 22 Oct 2008
Posts: 131
Location: Portland, OR
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| Posted: Fri Mar 07, 2014 12:20 pm Post subject: C4B5 missing boss mount hole |
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The hole you see to the right is not where it goes. That will be filled similar to Bob’s pic once the motor is assembled for real. It’s actually in the boss mount area to the left of the gaping hole. I assume the C4B5 had no reason for an accessory to mount there so Lycoming did not drill and tap that hole.
I did not think about making the smaller front hole work with a custom bracket. I guess I sorta figured that would be used for something else and just dismissed it. Good to know I’ll likely go this route.
Thanks All!
-Ben
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Linn Walters
Sent: Friday, March 7, 2014 11:56 AM
To: rv10-list(at)matronics.com
Subject: Re: C4B5 missing boss mount hole
Bummer. My fellow RV-10 builder found a similar 'flaw' on his case. He elected to drill/tap ..... and found the bottom of the hole isn't far from the inside of the case!!! He'll have to seal that screw well. However, it appears that the 'hole' in your picture is far larger than the screw. I'd clean out the hole real good, fill the hole with JB Weld, re-drill/tap. Use Locktite on final assembly.
Linn
IMHO, of course!!!
On 3/7/2014 2:25 PM, Ben Westfall wrote:
[quote]
I’m using an IO-540 C4B5 off of an Aztec that’s built up as a dummy core for now so I can do the initial cowl and baffling work. The case halves are the actual ones that will be used on final re-assembly of the motor. The issue I’m seeing is a missing boss mount hole for the CB-1002E fwd left support bracket that backs the fwd left air ramp baffling. Has anyone that’s used a C4B5 ran into this? I presume the hole can be carefully located and drilled and tapped but thought I’d ask the brain trust. See attached photos.
Ben Westfall
[b]
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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rene(at)felker.com
Guest
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| Posted: Fri Mar 07, 2014 12:30 pm Post subject: C4B5 missing boss mount hole |
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I had to do the same thing. Building is fun, I miss is sometimes. But, flying is fun also……
Rene' Felker
N423CF
801-721-6080
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Bob Condrey
Sent: Friday, March 07, 2014 12:45 PM
To: rv10-list(at)matronics.com
Subject: Re: C4B5 missing boss mount hole
Yes, I had that on the engine of my first RV-10. My solution was to make a replacement bracket to fit a hole outboard of what was shown in the plans. Picture (fuzzy) attached to give you an idea of what I did. Never heard of anybody else having this issue so I just made a replacement out of 3/4 angle and moved on. Hope this helps.
Bob
On Fri, Mar 7, 2014 at 2:25 PM, Ben Westfall <rv10(at)sinkrate.com (rv10(at)sinkrate.com)> wrote:
I’m using an IO-540 C4B5 off of an Aztec that’s built up as a dummy core for now so I can do the initial cowl and baffling work. The case halves are the actual ones that will be used on final re-assembly of the motor. The issue I’m seeing is a missing boss mount hole for the CB-1002E fwd left support bracket that backs the fwd left air ramp baffling. Has anyone that’s used a C4B5 ran into this? I presume the hole can be carefully located and drilled and tapped but thought I’d ask the brain trust. See attached photos.
Ben Westfall
[quote][b]
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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bwestfall
Joined: 22 Oct 2008
Posts: 131
Location: Portland, OR
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| Posted: Fri Mar 07, 2014 12:32 pm Post subject: C4B5 missing boss mount hole |
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Just for the record the right side has a similar boss mount area that does have holes drilled and tapped thus my assumption was the left side would support it. The attached photo shows the right side for reference. I’d much rather use the existing front hole than risk f’ing up the case that’s for sure.
Again, thanks and glad I asked. I must subconsciously love to do things the hard way as I was pretty much resigned to drill and tap before Bob pointed out what should have been obvious! Ah tunnel vision.
-Ben
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Linn Walters
Sent: Friday, March 7, 2014 11:56 AM
To: rv10-list(at)matronics.com
Subject: Re: C4B5 missing boss mount hole
Bummer. My fellow RV-10 builder found a similar 'flaw' on his case. He elected to drill/tap ..... and found the bottom of the hole isn't far from the inside of the case!!! He'll have to seal that screw well. However, it appears that the 'hole' in your picture is far larger than the screw. I'd clean out the hole real good, fill the hole with JB Weld, re-drill/tap. Use Locktite on final assembly.
Linn
IMHO, of course!!!
On 3/7/2014 2:25 PM, Ben Westfall wrote:
| Quote: |
I’m using an IO-540 C4B5 off of an Aztec that’s built up as a dummy core for now so I can do the initial cowl and baffling work. The case halves are the actual ones that will be used on final re-assembly of the motor. The issue I’m seeing is a missing boss mount hole for the CB-1002E fwd left support bracket that backs the fwd left air ramp baffling. Has anyone that’s used a C4B5 ran into this? I presume the hole can be carefully located and drilled and tapped but thought I’d ask the brain trust. See attached photos.
Ben Westfall
|
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
|
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bwestfall
Joined: 22 Oct 2008
Posts: 131
Location: Portland, OR
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| Posted: Fri Mar 07, 2014 1:06 pm Post subject: C4B5 missing boss mount hole |
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For the further record… I checked on the reason for that ½” hole right of the boss mount seeing that Bob’s appeared to be plugged. That is for a through bolt that is just not currently installed on my “fake” motor. Bob’s picture showed what appears as a plug bit is really the back end of a bolt. His case must be an older vintage where the through bolt threads into the case half, newer ones get a heavy nut and washer instead.
-Ben
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Linn Walters
Sent: Friday, March 7, 2014 11:56 AM
To: rv10-list(at)matronics.com
Subject: Re: C4B5 missing boss mount hole
Bummer. My fellow RV-10 builder found a similar 'flaw' on his case. He elected to drill/tap ..... and found the bottom of the hole isn't far from the inside of the case!!! He'll have to seal that screw well. However, it appears that the 'hole' in your picture is far larger than the screw. I'd clean out the hole real good, fill the hole with JB Weld, re-drill/tap. Use Locktite on final assembly.
Linn
IMHO, of course!!!
On 3/7/2014 2:25 PM, Ben Westfall wrote:
[quote]
I’m using an IO-540 C4B5 off of an Aztec that’s built up as a dummy core for now so I can do the initial cowl and baffling work. The case halves are the actual ones that will be used on final re-assembly of the motor. The issue I’m seeing is a missing boss mount hole for the CB-1002E fwd left support bracket that backs the fwd left air ramp baffling. Has anyone that’s used a C4B5 ran into this? I presume the hole can be carefully located and drilled and tapped but thought I’d ask the brain trust. See attached photos.
Ben Westfall
[b]
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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