Driftdown
Well Known Member
SAF-AIR OIL DRAIN SUMP VALVES for ROTAX
http://www.aircraftspruce.com/catalog/eppages/safOilDrainValves.php
http://www.aircraftspruce.com/catalog/eppages/safOilDrainValves.php
It also allows you to quite easily and cleanly change the oil with dropping the lower cowl. Not that I am advocating that or in any way presuming it to be the only viable technique, mind you....$39.95! That buys you a lot of crush washers - even from Rotax ...
. . . "The Saf-Aire quick drain did come with the copper sealing washer but did not come with torque specs so I called the maker and they said 60-70 inch-lbs, so that is what I used. Thats a whole lot less torque than specified for the Rotax steel drain plug." . . .
. . . "I use clear 91-92 mogas 95% of the time in my CT. In 380 hours of flying I have cleaned the tank twice. It was not worth the effort as it was clean." . . .
Tony,
To install the drain with measured torque, did it require you to use a crow foot?
The four little tabs around the perimeter are supposed to be towards the bottom of the tank (it is clearly shown in the IPC if you want to see a depiction of how it goes).
This should also give you the most clearance possible.
There are two types of plates in the bottom of the oil tank. One is an earlier modle. One is flat and the tabs do face down with the flat high surface facing up. Then there is the concave one. With this one the dome faces down and conforms to the bottom shape of the tank. This helps with oil flow. It sounds like you have the concave modle. You can see the differences in the Parts manual and the Line maint. Manual. These plates are interchangeable.
... It's amazing how dirty that oil tank gets ...
I have all my Rotax maintenance done by a Rotax certified AN&P (to avoid any warranty dispute and for my own safety too ). I noticed that when he changes oil he always takes the oil tank to his shop where he drains and cleans it. If this is the right way to change oil for a 912 installing a Drain Valve may not be that useful.
Some aircraft oil tank installs leave no option to access the oil tank drain plug so they do remove the tank to dump the oil which is perfectly acceptable.
The funnel idea I mentioned above I got from one of your RV12 users, works well and seems to keep everything clean. I forgot who told me about that idea.