High climb CHT on cylinder #4

[PT20J]

There is a little leakage on my clamped joint but it's small and on the outside and I've always thought it probably happens before everything heats up. I remember whenever I started a Beaver there would be a big puff of exhaust  from under the top back of the cowling (radials always have some oil in the exhaust from the lower cylinders when they start) from a slip joint that hadn't heated up yet.

[Shadrach]

1 hour ago, PT20J said:

There is a little leakage on my clamped joint but it's small and on the outside and I've always thought it probably happens before everything heats up. I remember whenever I started a Beaver there would be a big puff of exhaust  from under the top back of the cowling (radials always have some oil in the exhaust from the lower cylinders when they start) from a slip joint that hadn't heated up yet.

Interesting that Mooney recommends C5A Anti seize (copper based with graphite) but Mcfarlane says that graphite will corrode and destroy the grain structure of 321 stainless.

Is it fact or is it marketing???...my guess is that the exhaust is not so fragile that graphite will do much damage..

[PT20J]

3 hours ago, Shadrach said:

Interesting that Mooney recommends C5A Anti seize (copper based with graphite) but Mcfarlane says that graphite will corrode and destroy the grain structure of 321 stainless.

Is it fact or is it marketing???...my guess is that the exhaust is not so fragile that graphite will do much damage..

Interesting. I’ve always heard that graphite is bad for exhaust parts - that’s why you aren’t supposed to label them with a pencil. And, I didn’t know until now that C5-A contained any graphite. According to the SDS it has about half as much graphite as copper. Maybe it’s not enough to cause a problem. I’ve always used it on the tail pipe ball joint. 

Any metallurgists about?

EDIT: I checked AWI’s website and they also approve C5-A. I just like the McFarlane stuff for the slip joints because it is water thin and will wick into the joint without disassembling anything.

Edited July 9, 2024 by PT20J
Added AWI note