Oil in Belly

[GAdams]

I cannot find an oil leak. The gear transmission or what ever you call it has grease installed at manufacture. Perhaps it is a grease that has exceeded its temperature limit. 200-500 F. If so what’s making it so hot? The oil as described is a yellow color and now the oil in the engine has a few hours on it since the change. Ideas?

[wslade2]

is your oil level dropping? Is your hydraulic fluid level dropping? I believe you are describing the main gear actuator. nothing should make the grease that hot. Could it be grease wetted/mixed with hydraulic fluid? ie, maybe you have hydraulic leak of main gear actuator. Also, brake line passes through that area. Old brake fluid can look funky. Brake function? Brake fluid level?

[GAdams]

Oil level is not dropping. Hydraulic fluid level seems to need servicing occasionally. I can always tell because the left main gear door pops open. Put a little fluid in and its fine. That has stabilized. Hydraulic power pack was overhauled less than one year ago. The fluid doesn't look polluted with another fluid or dirty such as old oil. Brakes work no leaks, not the greatest stopping power. If you clean up the belly inside and remove the fluid from the bottom of the aircraft it returns on the next flight. Yellow, consistency like a thick oil and doesn't really have much of a smell.

[Red Air Rambo]

I would look at the gear door actuators, start with the left main and keep going.
They have to be rebuilt just like the powerpacks...I think Rick Cox did mine.

[wslade2]

as per Rambo
making a list, 4 fluids in the airplane: gas, oil, hydraulic, brake (also hydraulic)
it's not gas collecting
oil level not dropping and if you did Dr Dave test, that's out
brakes not great: possible
hydraulic needs topping off (must be going somewhere) and gear door dropping-suspicious
I had a very small leak from my emergency hand pump. By the time the hydraulic fluid mixed with the dust and grit in the belly it was black, not red, dripping out the weep hole. Don't count on the color. I ended up using scope to confirm hand pump was the source of the leak. You can get from harbor freight and on occasion have seen at hardware store.
Chase what you know is wrong. Hydraulic fluid is going somewhere. Plus I would put a hydraulic leak pretty high on the list of something to investigate whether or not it's the problem in the end.

[DrDave]

Okay, let me add one more thing. I promise this won't be wacky like the copper line mistake. We developed a small collection of oil in the center bay of the floor under the gear actuator. The oil would also drip off the left gear leg door if it was left open. I put towels under the motor for a couple of days. After two days the towel under the sump quick drain was wet. The oil was running off the sump drain and down the inside of the lower cowling into the belly.

I tried to attach a picture. Hope it works.

Dave

[GAdams]

Here is a picture. It's not oil, it's not 5606, it's not fuel. My mechanic's theory on the hydraulic fluid disappearing after the power back overhaul was, air bubbles were stuck in the system and as the gear was cycled the hydraulic fluid needed filling. The hydraulic level has stabilized an I have not added hydraulic fluid in quite awhile. He may be right. I don't know. I appreciate all the input. Please keep it coming.