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Air craft gear box OIL
- Thread starter c chardt
- Start date
Tide Runner
Well-known member
We put a 480 gear box on my brothers 500 caddy two years ago and use 90 wgt gear oil in it with no problems at all... also we put a over flow tank on top so when you are running it gives the oil some where to go when presure builds up... We filled the gear box about half full up th the cap thats on the side. hope this helps
wayne
wayne
Tide Runner
Well-known member
Not really that hard,Had to make a plate out of 3/8 aluminum to bolt with spacers to the block then a 5" hole machined in the center with a 5" seal for the crank, The planetary gear we had to drill bolt holes to bolt to the crank, and then the gear box centered and bolted to the aluminum plate... then all spaced out to the right distance so nothing was in a bind.. not really in this order the first thing would be to get the hole in the center of the alum. plate and the gear box centered with the hole and the gearbox lined up with the hole and drilled to bolt on then put it up to the block and drill the holes to bolt it to the block. maybe you get the idea out of all this
cc,
I checked with my friend that has the twin engine airplane with GO480's on it. He is not only a very experienced pilot, but also a licensed aircraft mechanic. The gearbox is pressure fed from the engine oil system, so it uses engine oil in the airplane application. He uses Aeroshell W100 in the engines which is equivalent to a SAE 50 weight oil. It is also an ashless dispersant oil. It is not a detergent oil. Detergent oils are not approved for aircraft. This is one of the oils that is approved for that engine as of 2005. Some of the very old manuals may say something else.
I am not saying that other oils will not work, but that is what is used in the airplane application.
Jim
I checked with my friend that has the twin engine airplane with GO480's on it. He is not only a very experienced pilot, but also a licensed aircraft mechanic. The gearbox is pressure fed from the engine oil system, so it uses engine oil in the airplane application. He uses Aeroshell W100 in the engines which is equivalent to a SAE 50 weight oil. It is also an ashless dispersant oil. It is not a detergent oil. Detergent oils are not approved for aircraft. This is one of the oils that is approved for that engine as of 2005. Some of the very old manuals may say something else.
I am not saying that other oils will not work, but that is what is used in the airplane application.
Jim
I work on similar aplications and had the best results with synthetic gear oil. Lots of weights available and at 40 degrees below F, 75-90 synthetic worked fine. This is in aircraft deicers and the pumps had 180 F, Glycol going through them. Even in a warm climate I think 75-90 would be fine however you can go thicker. Only negative experience with synthetic I have experienced is a little more seepage past seals however an ocasional pressure wash fixes that. Hope this helps!
Just thought, these pumps we were running had a helical speed up drive of about 1:2.4 and we would generally have to rebuild the units at about 300 hours as the top shaft was always spinning a little over 5500 rpm. With synthetic we got up to 1000 hours out of the units with only seasonal oil changes (around 300 hours a year) without failure.
I am saying depending on the temp. your gearbox is running at 75/90 Syn. should handle it. Find out what temp your box is running at. Thats why a generous supply of engine oil as in this boxes original aplication or transmission fluid on big clutch pack transmissions with planetarys don't have a problem with light lubricant. Lots of cool oil. Lazer temp. tools are around and cheap now, (lots of uses) or put in a cheap (or good) bulb type gauge in your box.