Originally Posted by
Detlef Kunkel
I think I posted this before? not sure
When I took off the heads for the second time ( reaming the guides for more play) I machined lubrication tubes into the exhaust guides.
A machine job, no free-hand
Only exhaust is needing this, inlet lubricates itself from the oil gasoline mixture.
Every 2 flights I give it a (central = red arrow) push with teflon lubricant. It works and saves uncounted disassemblies of prop and cowling. 3 lost pushrods and 2 bent ones were enough to make this solution reasonable.
Detlef, I can't thank you enough for this post. This is something that I need to get started on. I think I'll pull one of the heads today and measure out the exhaust valve guides to get an idea what kind of reamer to order. You've said it before but it's crazy we have to go through this with a $5K engine. But WOW is it worth it in the end.
One question: what kind of red flexible tubing is that that will take the heat of that cylinder head, especially on the exhaust side? I would think only silicon would take that kind of heat.