Replace pistons at overhaul???

[mfleming]

Originally Posted by Walt

An "overhaul" done in "Joe Blows" hanger is not really an "overhaul" is my point. Someone that does an engine "overhaul" that does not use parts that have been approved/inspected/checked/replaced IAW the OH manual has not done an overhaul.

If were trying to figure out how to clean the pistons, I doubt they or the cylinders have been checked to see if they meet the dimensions/limits in the manual. If you're going to OH an engine you can't just pick and choose what you want to do, you got to do it all otherwise its just a repair and not an "overhaul".

I respect your experience and knowledge but those are a lot of assumptions my friend.

Following the overhaul manual and reusing where approved and replacing when indicated is an overhaul. To say other is disingenuous.

Should the OP replace the cylinder assembles just because...maybe but the ones in hand, if within overhaul limits may be more proven than a brand new cylinder assembly.

That being said, I'm buying a new engine for my build. And if I ever get to the point of needing an overhaul, This Joe Blow might just do it himself

[N941WR]

Why not replace the cylinders, valves, connecting rods, and pistons while you are at it?

Call Rhonda at http://www.bpaengines.com/ for a quote. I think you will be surprised at how reasonable they are.

[mfleming]

Originally Posted by N941WR

Why not replace the cylinders, valves, connecting rods, and pistons while you are at it?

Call Rhonda at http://www.bpaengines.com/ for a quote. I think you will be surprised at how reasonable they are.

Man, some of you guys must be made of money

[N941WR]

Originally Posted by mfleming

Man, some of you guys must be made of money

I wish. However, when you compare the cost of "new" to the cost of "refurbished", they aren't that far apart.

[mahlon_r]

If you are overhauling because of a severely spalled cam, your pistons are not useable and already ruined because you will find steel from the cam and tappets imbedded in the piston skirts....
Good Luck,
Mahlon

[j-red]

Originally Posted by mahlon_r

If you are overhauling because of a severely spalled cam, your pistons are not useable and already ruined because you will find steel from the cam and tappets imbedded in the piston skirts....
Good Luck,
Mahlon

Exactly what I was looking for. Thanks!

[jjconstant]

You can always count on Mahlon!

[penguin]

Thinking about eventual sale price, if you were to use complete new cylinder assemblies, when you come to sell the aircraft (whenever that is), the price you might get will likely be significantly more than the difference in cost between overhauled and new cylinders. I would install new cylinders every time, as said previously the cost difference is just not that great. Pete

[az_gila]

Originally Posted by penguin

Thinking about eventual sale price, if you were to use complete new cylinder assemblies, when you come to sell the aircraft (whenever that is), the price you might get will likely be significantly more than the difference in cost between overhauled and new cylinders. I would install new cylinders every time, as said previously the cost difference is just not that great. Pete

Interestingly, even though the Lycoming factory sells both rebuilt and overhauled engines they put new cylinder assemblies on both.

[664781]

Look up the definition of "overhaul" by the FAA and you will be surprised!

Not what you would expect.