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  #21  
Old 08-14-2013, 10:55 AM
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tmbg tmbg is offline
 
Join Date: Jan 2008
Location: Atlanta, GA
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Quote:
Originally Posted by Mel View Post
Yes, Lycomings are dirt simple engines. On the other hand, they are not like a small block Chevy. Air cooled engines are quite different from water cooled ones. If you put up an air cooled engine to the tolerances of a liquid cooled one, you will be asking for trouble.

As an aside; be it known that even an A&P cannot legally overhaul a certified aircraft engine unless he has done that particular model under supervision before.
Naturally, paying attention to the Lycoming Direct Drive Overhaul Manual, and the table of limits, is called for. I'm also at an advantage in that I have an A&P and A&P/IA to peer over my shoulder at everything I do
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  #22  
Old 08-14-2013, 11:11 AM
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rocketbob rocketbob is offline
 
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Quote:
Originally Posted by Tim 8-A View Post
A different perspective, As a buyer I would not buy a aircraft unless the engine was new or built by a well known engine shop.
This is bad advice to give. The RV-6 I fly has an engine built by a reputable shop and I've found several things wrong with it, some of them serious that required cylinder overhaul.

The things I look for:
1. Documented AD compliance with detailed descriptions of how compliance was determined.
2. Documented main bearing clearances during assembly.
3. Main and rod dimensions (is this a last run crank?)
4. Documented rod bolt replacement.
5. All yellow tags retained.
6. Was balancing done.
7. Individual cylinder bore diameters.

...in other words, the guy who really cares about quality is the one that documents everything so the next guy doesn't have to question what was done.
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  #23  
Old 08-14-2013, 11:38 AM
David-aviator David-aviator is offline
 
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Location: Chesterfield, Missouri
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Potential resale was a factor when I considered the issue.

A log with a new engine is always more marketable than one with a 35-40 year old engine no matter what has been done to it. But if you plan to sleep with it forever, it doesn't matter does it.
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  #24  
Old 08-14-2013, 12:35 PM
N15JB N15JB is offline
 
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When I built my Pitts S1S I did the overhaul of its IO-360 with some help from my local engine shop. When I was building my -10 I decided to have the engine done by a pro, because there would be times I was putting 3other butts on the line.

Jim Berry
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  #25  
Old 08-14-2013, 12:35 PM
EagleEngines EagleEngines is offline
 
Join Date: Aug 2013
Location: Redding
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Default IRAN

It may be a good option to purchase a core engine and send it in for an inspect and repair as needed (IRAN)
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  #26  
Old 08-14-2013, 02:09 PM
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hgerhardt hgerhardt is offline
 
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Quote:
Originally Posted by rocketbob View Post
I've seen enough shoddy work from shops that are supposed professionals that I wouldn't ever let someone build one for me....
AMEN to that!
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  #27  
Old 08-14-2013, 03:28 PM
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rbibb rbibb is offline
 
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Just because someone has an A&P or an IA for that matter is not guarantee they know what they are doing. Just read the article in SA I think it was that documented the wrong answers that the FAA considers right required to pass the test.

Having said that a good A&P is worth their weight in gold. But overhauling these engines isn't that hard if you send out all the parts to reputable places and pay attention to every step called for in the overhaul manual. I overhauled the O-320-E2D in my -4 for the education that was in it.
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  #28  
Old 08-14-2013, 03:31 PM
hohocc hohocc is offline
 
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Location: Christchurch, New Zealand
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Default Roller rockers

Mel,
In one of your posts you mentioned you used roller rocker arms.
Where are these available from, and now that you've had them for a while, would you use them again?
Thanks.
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  #29  
Old 08-14-2013, 04:20 PM
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Mel Mel is offline
 
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I actually installed the roller rockers in September of 1994, one and one half years and 110 hrs. before the rebuild. I wanted to prove them before the OH.
They were made by Ken Hatfield and haven't been available for quite a few years.
They are still in the engine today and I've not had any problem with them. I've also not had any noticeable valve guide wear, so they must be working.
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Last edited by Mel : 08-14-2013 at 04:25 PM.
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  #30  
Old 08-15-2013, 09:29 AM
PaulR PaulR is offline
 
Join Date: Oct 2005
Location: Geneva, AL
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Default Roller Rockers

I seem to remember reading somewhere that the roller rockers made for one of the V-8 Ford engines would interchange with the rockers on our Lyc. cylinders.

Is that true? They would have to help with guide wear.
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