Engine rebuild question please.

[hammdo]

That describes my birds engine exactly. Almost the exact same IRAN - with a new prop… oil consumption is great and the engine has 721 hrs since IRAN ~2100 hrs SMOH - first run cylinders IRAN, engine was a first run oh from lycoming… aircraft specialities and Airmark did the work…

-Don

[A64Pilot]

If for example I pull a jug because the base O-ring is leaking oil, so long as it’s in good shape I put it back on and not touch the piston and rings, in fact I don’t pull the piston from the jug, I pull it out just enough to slide the wrist pin out and leave the piston in.

In my opinion, if honing and new rings are justified, then a cylinder overhaul is justified.

If your going to hone it and fit new rings, why not do it right and have it honed to next size and fit a new piston with those rings, and if your replacing the piston and rings, go ahead and have the valve train done and that’s an overhauled cylinder.

As often as not it’s valve guide wear and or leaking valves that push you into a cylinder overhaul.

[Mcstealth]

I think I'm going to go to an AP school so I can do my own work.

Watching these guys work gives me anxiety.  How many smoke breaks does one really need!!!

Grrrrr

Edited September 25, 2023 by Mcstealth

[M20F]

4 hours ago, A64Pilot said:

If for example I pull a jug because the base O-ring is leaking oil, so long as it’s in good shape I put it back on and not touch the piston and rings, in fact I don’t pull the piston from the jug, I pull it out just enough to slide the wrist pin out and leave the piston in.

Agreed if the piston isn’t leaving the barrel it is the same as if it was on the plane, no need to change anything here.  

[jetdriven]

7 hours ago, A64Pilot said:

If for example I pull a jug because the base O-ring is leaking oil, so long as it’s in good shape I put it back on and not touch the piston and rings, in fact I don’t pull the piston from the jug, I pull it out just enough to slide the wrist pin out and leave the piston in.

In my opinion, if honing and new rings are justified, then a cylinder overhaul is justified.

If your going to hone it and fit new rings, why not do it right and have it honed to next size and fit a new piston with those rings, and if your replacing the piston and rings, go ahead and have the valve train done and that’s an overhauled cylinder.

As often as not it’s valve guide wear and or leaking valves that push you into a cylinder overhaul.

 

better is the enemy of good enough... Might as well pull all 4 cylinders then.... Moght as well split the case and do that part too. Putting the right finish on the cylinder wall with a flex hone as long as it's standard size is an acceptable repair. Obviously if it has valve issues or the guides are shot you should fix those, but not just because the cylinder came off  

 

[LANCECASPER]

18 hours ago, Mcstealth said:

I think I'm going to go to an AP school so I can do my own work.

Watching these guys work gives me anxiety.  How many smoke breaks does one really need!!!

Grrrrr

Some people bring donuts, some bring pizzas to build good relationships at the shops that they use. Have you considered Nicorette patches or gum . . .lol?