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10-03-2018, 07:12 PM
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Join Date: Oct 2005
Location: Melbourne, Australia
Posts: 1,868
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The questions you are asking and your assembly mistakes would seem to indicate that you may not have the appropriate expertise to assemble your own engine. You would be much safer getting a qualified person to do it for you. If the engine parts are already overhauled then getting it reassembled should not be a costly exercise. An aircraft engine is a life support system. This is not an area where you want to put your life, and your passengers lives, at risk just to save a modest amount of money.
__________________
You’re only as good as your last landing 
Bob Barrow
RV7A
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10-03-2018, 08:02 PM
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Join Date: Oct 2017
Location: Portugal
Posts: 81
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Quote:
Originally Posted by Captain Avgas
The questions you are asking and your assembly mistakes would seem to indicate that you may not have the appropriate expertise to assemble your own engine. You would be much safer getting a qualified person to do it for you. If the engine parts are already overhauled then getting it reassembled should not be a costly exercise. An aircraft engine is a life support system. This is not an area where you want to put your life, and your passengers lives, at risk just to save a modest amount of money.
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Hello Bob,
I had rebuild one O200 on the past. My question was the flexible I had about mix them up since I knew I shouldn't do it according to the manual but not why or if it would not be a problem. Now I understood I am not able to make it and the reasons for this is why I appreciate the help on the forum. I did not make the mistake of mix the parts, just wanted to know if that was possible and the reason.
About the rod mounted with the number opposite, I realize the direction and this was the reason for my question. I am following all assembly according to with the manual step by step with the help and supervision of a certified mechanic, however, he know how to do the things but not the reason. My main aim to post on the forum was to understand not to do according to or against the manual but the why/reason of it.
Thanks!
Last edited by filiperosa : 10-03-2018 at 08:09 PM.
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10-04-2018, 05:56 AM
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Join Date: Jan 2014
Location: Fredericksburg, Virginia
Posts: 288
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If it were a car...
Quote:
Originally Posted by filiperosa
Hello Bob,
I had rebuild one O200 on the past. My question was the flexible I had about mix them up since I knew I shouldn't do it according to the manual but not why or if it would not be a problem. Now I understood I am not able to make it and the reasons for this is why I appreciate the help on the forum. I did not make the mistake of mix the parts, just wanted to know if that was possible and the reason.
About the rod mounted with the number opposite, I realize the direction and this was the reason for my question. I am following all assembly according to with the manual step by step with the help and supervision of a certified mechanic, however, he know how to do the things but not the reason. My main aim to post on the forum was to understand not to do according to or against the manual but the why/reason of it.
Thanks!
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If you were building a car engine your thoughts about balancing would be correct, but as mentioned in the previous replies, there ARE differences in aircraft engines.
Daddyman
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10-04-2018, 11:06 AM
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Join Date: Dec 2009
Location: La Center,wa
Posts: 210
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I am not an engine expert, so no advice there. Just wanted to say don't let any negative feedback deter you form asking questions!
Tim
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10-04-2018, 12:12 PM
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Join Date: Jul 2015
Location: Cole camp, mo
Posts: 24
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No, please no
Please don?t mix up or invert the rod caps on anything, aircraft or auto. Balancing of rods is not performed in any field that I?m aware of by mixing and matching. The rod caps are typically milled, bolted on, torqued and then line bored/honed to size making each assembly unique. In the automotive field once this occurs then minor sanding or grinding of certain areas of the rod is performed in order to balance. I?m sure others know much more than I about this however it is very alarming thinking someone would attempt to switch rod caps as it is certainly a recipe for catastrophic failure.
__________________
James Stoppel
RV8 Purchased Flying
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10-04-2018, 12:55 PM
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Join Date: Oct 2017
Location: Portugal
Posts: 81
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Quote:
Originally Posted by tjo
I am not an engine expert, so no advice there. Just wanted to say don't let any negative feedback deter you form asking questions!
Tim
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Thanks Tim,
That was the primary objective of my question. An idea came to my head and I decided to ask about that idea. From the beginning, I knew what was on the manual but I think is always a good idea to discuss things and why something don´t work or it might work.
Quote:
Originally Posted by Stoppel
Please don’t mix up or invert the rod caps on anything, aircraft or auto. Balancing of rods is not performed in any field that I’m aware of by mixing and matching. The rod caps are typically milled, bolted on, torqued and then line bored/honed to size making each assembly unique. In the automotive field once this occurs then minor sanding or grinding of certain areas of the rod is performed in order to balance. I’m sure others know much more than I about this however it is very alarming thinking someone would attempt to switch rod caps as it is certainly a recipe for catastrophic failure.
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Thank you all. I am not mixing up anything and not doing any balance. I saw the manual and something come to my head and I decided to come to the forum to ask the possibility. I understood that is not possible but more important than that. I understood why and good explanations and that was what I was looking. Thank you all for it.
Filipe
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10-04-2018, 01:29 PM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by filiperosa
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Now that we've thoroughly covered "don't swap the rod caps", so let's go back to the last photo. Per the manual, the numbers should face down, toward the sump. Number 1 is the right front cylinder. See the error?
__________________
Dan Horton
RV-8 SS
Barrett IO-390
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10-04-2018, 01:50 PM
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Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,297
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Quote:
Originally Posted by daddyman
If you were building a car engine your thoughts about balancing would be correct, but as mentioned in the previous replies, there ARE differences in aircraft engines.
Daddyman
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This is incorrect. The rods in auto and aircraft engines are fundamentally the same design and balanced the same way. The OP's approach would be just as wrong on an auto engine.
Larry
__________________
N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
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10-04-2018, 04:26 PM
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Join Date: Oct 2017
Location: Portugal
Posts: 81
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Quote:
Originally Posted by DanH
Now that we've thoroughly covered "don't swap the rod caps", so let's go back to the last photo. Per the manual, the numbers should face down, toward the sump. Number 1 is the right front cylinder. See the error?
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Hello Dan.
As per the photo all the numbers are facing down. My red circles are the dots/markers/notches, do not know the name in English since it is not my main language. But the numbers are down and the dots up. Do not see the mistake, can you point me?
Filipe
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10-04-2018, 05:25 PM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by filiperosa
Hello Dan.
As per the photo all the numbers are facing down. My red circles are the dots/markers/notches, do not know the name in English since it is not my main language. But the numbers are down and the dots up. Do not see the mistake, can you point me?
Filipe
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Ok then, you're good. I was mistaken; thought you had numbers up.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
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