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JohnF
Joined: 13 May 2010
Posts: 124
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 Posted: Thu May 13, 2010 1:25 pm Post subject: Rotax 912ULS Question |
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Rotax instructions for purging the air from a new engine has you pressurize the oil reservoir to force oil through the engine as you turn the prop. They also instruct you to drop the line from the bottom of the engine (sump) that normally is the return line to the reservoir and put it from the sump into a bucket on the floor under the engine.
On the RV-12 I am building that line takes over an hour to snake through all the other hoses, wires, cables, etc, and requires dropping the exhaust muffler to get at the sump fitting.
I see no reason for that. The line could be simply removed from the oil reservoir and the normal input then capped so that when pressure from your air compressor is put into the reservoir and you turn the prop you force oil through the engine...if it collects in the sump and you have that recommended hose connected to a bucket the oil will have to be poured back into the reservoir (I am assuming a new engine and the oil is still unused and clean.)
When you remove the air pressure from the reservoir and reconnect things you then turn the prop and get the sump pressurized which forces the collected sump oil back into the reservoir.
What good does dumping it into a bucket do? Just extra work, and a very difficult trick on an RV-12.
If anyone knows why Rotax suggest this I would like to know.
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rampil
Joined: 04 May 2007
Posts: 870
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| Posted: Fri May 14, 2010 5:27 am Post subject: Re: Rotax 912ULS Question |
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The rationale or the Rotax method is to be as sure as possible
to remove all air from the pressurized side of the system and
eliminating places where bubble can hang up.
On my Europa, it takes about 5 minutes to pull that hose into a
bucket, or to replace it altogether as I did for my last annual. I
used Aeroquip FC 322-8 with heat shield. Maybe you can re-route your
hose?
If you are building your 12 as "Experimental" instead of ELSA,
please report back with your results.
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