charlesd harbert wrote:

Ed, Dave Atkins gave me the p/n for the elec scavenge pump. It's the largest
volume (lo pres) 12v fuel pump stocked by NAPA. Kathy can probably give you the
number. It's about $50 as I recall. My Ross has 3 stock openings. The top 1/8"
pipe for pressurized oil in, a 3/8" pipe fill/vent line about halfway down on
pilot side, and a 3/8 pipe bottom drain. The bottom drain is connected to the
scavenge pump. The pilot side fill/vent is my emerg return to the side of the
main oil fill tube in case the pump fails. I used a clear plastic tube for the
vent line to see if the pump was evacuating the gbox. I kept increasing the oil
going to the gbox until I started to get oil coming up the vent line (at higher
rpm). I get a little seal leak when the oil is cold, but none when the oil is
warm. Make sure afterwards that you don't use a clear plastic line for oil
because it can't take very much temp or pressure, plus they are not fire
resistant (pls see my posting later today).

If your banging into the flywheel spline, that force is being absorbed by the
Torrington thrust bearing inside the engine. If you have excessive end play on
your e-shaft, it means the thrust bearing is failing. That's why Tracy and
others added the thrust brg in the gbox. The guy who did it for Dave Atkins and
I is Ray Baker (Baker Machine) at 206-367-1314.  Have you inspected the sun and
planet gears for wear? We also added an oiling system for the sun gear. Tracy's
unit has these enhancements built in. It's about $400 from Baker depending on
what you want done, but you'll have to decide if your gears are okay.

If you saw Paul's earlier posting showing a New Horizons showing a hydrodynamic
pump on the outside of the ring gear, I tried to do that 6 mos ago, but because
the Ross ring gear is smooth on the outside, it didn't work. Also, you can't get
the Ross apart unless you cut out a special pressed pin.  You will need his prop
shaft pin afterwards, which I understand he doesn't like to give out.

Hope this helps. Good luck.

Did you put a scraper in there Chuck? How much clearance did you have?
I don't think you have to take the PSRU all the way apart to do this. All you need
do is get the planet carrier out of the ring gear. No need to remove the
prop shaft from the housing. See the drawing below.

All you need do is pull part 8 out. This will give you access to the space
between the ring gear and the housing to slip in an oil scraper. It can be held
in place with small machine screws inserted from outside of the bottom of the
housing. If necessary drill and tap the oil scraper. Teflon would probably
work if you are worred about the ring gear contacting the oil scraper.

Paul Lamar
 
The Aircraft Rotary Engine Newsletter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org