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#1
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The oil pressure lines from the motors are copper lines. They are prone to cracking. Over the years they lose their ductility. There are no unions in those lines until they meet up with the barely flexible lines at the inside of the front firewall behind the gauges.
A good test is to pull the line from the rear motor at the T on the passenger side in the middle of the case. Pressurize that with your nitrogen tank to no more than 50psi. You can T in a tire pressure gauge to that test line too. This will facilitate finding a leak and give you an idea of the accuracy of your oil pressure gauge. In performing this test to repair a leaking oil pressure line in the belly I found that the response of the oil pressure gauge is poor. Below 30psi the needle didn't move. At 50psi it slowly came up. I flushed out the line with solvent but it made no difference. Dave Last edited by DrDave : 03-10-20 at 12:13 AM. Reason: afterthought |
#2
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Superior idea!
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#3
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Correction
The information I wrote last night about the oil pressure lines was absolutely wrong. The oil pressure lines are made from aluminum tubing. There are a few unions along the entire route. For some reason I was thinking about the copper primer lines. The aluminum lines can leak at any of the unions. Look closely for any splits in the flared aluminum pieces. My oil leak was a pin-hole in the middle of one of the aluminum lines. It was not rubbing on anything.
I am sorry for the previous mis-information. Dave |
#4
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Liquid grease
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?
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#5
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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?
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#6
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Hot Grease
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.
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#7
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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. |