nippaero
Well Known Member
I recently got my hands on an O-320 that was removed from a Cherokee 140. I plan on rebuilding the engine with some local help.
I have some questions on the cylinders though and I was hoping someone could help get me pointed in the right direction.
1) How can you tell if they are Plain steel or chrome plated? Two of the cylinders are marked 75868 which appears to me to be plain steel per the Lycoming parts catalog. Is there another way to tell?
2) One cylinder has a valve guide that looks different from the others. It appears to have a small impression and machined ribs. Anyone know what this is?
3) Two of the cylinders have yellow paint on them. Does this mean that they have been bored out .020" oversize?
4) Two cylinders are marked 75868 and the other two are marked LW12417. I can't seem to find reference to the LW12417. Can someone help me identify it?
I have some questions on the cylinders though and I was hoping someone could help get me pointed in the right direction.
1) How can you tell if they are Plain steel or chrome plated? Two of the cylinders are marked 75868 which appears to me to be plain steel per the Lycoming parts catalog. Is there another way to tell?
2) One cylinder has a valve guide that looks different from the others. It appears to have a small impression and machined ribs. Anyone know what this is?
3) Two of the cylinders have yellow paint on them. Does this mean that they have been bored out .020" oversize?
4) Two cylinders are marked 75868 and the other two are marked LW12417. I can't seem to find reference to the LW12417. Can someone help me identify it?