Cylinder for IO360-A1A

[M20F]

Lost my #3 cylinder today looks to be part LW10925, haven't pulled it off yet but interested on opinions for replacements.

[N33GG]

How many hours on it? Was it factory new?

[N201MKTurbo]

What do you mean you lost it?

[M20F]

What do you mean you lost it?

[N201MKTurbo]

Bummer.

If your cylinder has hold down plates under the base nuts then it is a narrow deck.

It can probably be fixed unless the valve destroyed the cylinder.

[jkhirsch]

Precision Engine at OWB Bill Scott, just dropped off a cylinder there for a Oil Control ring job. Learned more in 1.5 hours from him than any mechanic ever.

[N601RX]

If the valve head broke off and jammed into the piston then there is a possibility that the connecting rod is bent.

[rbridges]

did it happen during flight?  

[M20F]

did it happen during flight?

Yes

If the valve head broke off and jammed into the piston then there is a possibility that the connecting rod is bent.

We pulled it through with the valve cover off and both valves were full extending/retracting smoothly so think the rods are good. It could be the piston head just shattered as well. Hope to get it off this week and will know more.

[carusoam]

When my O360 exhaust valve stuck, it bent the valve stem. The solution was to replace the whole cylinder...

Hopefully, you get a better result.

best regards,

-a-

[N601RX]

Yes

We pulled it through with the valve cover off and both valves were full extending/retracting smoothly so think the rods are good. It could be the piston head just shattered as well. Hope to get it off this week and will know more.

I was referring to the connecting rod that attaches the piston to the crankshaft.

[N201MKTurbo]

It sounds like you might just have a stuck valve. If they stick open, the piston will smack them and push them back in leaving a mark on the top of the piston. If that is the case you can fix it without removing the cylinder.

[Shadrach]

A sticky/stuck valve can be repaired without removing a cylinder. But the idea that a cylinder that has suffered contact between piston and valve is airworthy seems ridiculous. A piston hitting a valve does not just "push the valve back in". The movement of the piston is at an angle to the movement of the valve, pistons typically bend valves when they hit them, not help them actuate...

[tony]

A sticky/stuck valve can be repaired without removing a cylinder. But the idea that a cylinder that has suffered contact between piston and valve is airworthy seems ridiculous. A piston hitting a valve does not just "push the valve back in". The movement of the piston is at an angle to the movement of the valve, pistons typically bend valves when they hit them, not help them actuate...

 That's exactly right. 

[mike_elliott]

Precision Engine at OWB Bill Scott, just dropped off a cylinder there for a Oil Control ring job. Learned more in 1.5 hours from him than any mechanic ever.

 

 

Bill is a very good rebuilder, who understands valve geometry and gets it right.

[garytex]

I hav a couple three hundred hours on 2 rebuilt cyls from Custom Airmotive in Tulsa, no squawks.  Additionally those boys know their stuff on IO-360 motors, up one side and down the other.  I'm really fussyabout rebuilt cyls., because I think new is much better for most engines, if its more than 1000 hrs to TBO.  However we do not have a good aftermarket source for our angle valve cyls, so sometimes rebuilt well for $1100 makes sense as opposed to $2400 for new.

Of course it is all moot if you've got metal through the motor.  Besides the screen and filter, try to get a look at a bearing shell or two to see what lies therein.

Let us know what happens,

Gary