Installation of M20-Turbos Air-Oil-Seperator M20J

[Magnum]

Hello,

due to the Oil Consumption thread I remembered that I have a new M20-Turbos Air/Oil Seperator laying around for two years.

I would like to install it now but I am not sure how to route the oil return line. In the manual they recommend to drill a hole in the rocker box cover or weld a Y-piece to the rocker box oil return line. Does someone have some pictures of his installation? Is it really necessary to keep the downslope at 180° +-50°?

Thanks for any info.

[laytonl]

I would not waste my time if I were you.  We installed an M20 and saw no difference in oil consumption and belly oil.  I know the installation process is critical and I believe we followed all of the guidelines for routing.  Anything over 6.5 qts blows out.  To answer your question, we had a motorcycle shop weld a Y-fitting onto the oil return line at about 150 degrees from straight up.

Lee

[Gone]

I have one of these installed on my E model.  The installation seems pretty straight forward and my AME (Canadian for A&P) followed all the installation requirements.  It is finicky when it comes to the angles of the return line.  But I do not feel it is doing as good a job as it should. 

When we overhauled my engine last year, the engine shop guy did not want it reinstalled (at risk of loss of warrantee) unless there was a condensation bowl put in the return line.  It works and catches condensate on the way back.  The brown stuff in the bowl that we drain during our 25 hour oil changes is actually a mixture of oil and water.

I talked to an Airwolf rep at Osh and he tells me that the way they get rid of the water in the air-oil mixture for their device is to hook a line from the exhaust of the vacuum pump.  That line puts 200 deg F air into their air-oil separator and boils off the water  to send that vapour out another line so that the oil goes back into the system absolutely dry.  I know he is biased towards their (much larger) air-oil separator, but it seems like a better approach.

But they cost about $350 each.

[Piloto]

I have an M20 separator on my M20J and have seen it installed on the newer Mooneys. I can fill to 8 qts and have no belly stains. Oil comsumption is about 18hrs/qt when topped to 8 qts. Mine drains thru the valve rockers cover. Because the m20 separator relies on gravity for oil return there are several items to be considered:

1. The separator inlet must be higher than the crank case outlet vent fitting

2. The drain line should be kept as straight as possible with no bends or kinks.

3. The outlet line should run as vertical as possible.

4. There should not be any holes on the outlet line.

The M20 separator would discharge part of the recovered oil after engine shut down. So you will see an increase in oil level after a week shut down.

José   

[Magnum]

Quote: Piloto

I have an M20 separator on my M20J and have seen it installed on the newer Mooneys. I can fill to 8 qts and have no belly stains. Oil comsumption is about 18hrs/qt when topped to 8 qts. Mine drains thru the valve rockers cover. Because the m20 separator relies on gravity for oil return there are several items to be considered:

1. The separator inlet must be higher than the crank case outlet vent fitting

2. The drain line should be kept as straight as possible with no bends or kinks.

3. The outlet line should run as vertical as possible.

4. There should not be any holes on the outlet line.

The M20 separator would discharge part of the recovered oil after engine shut down. So you will see an increase in oil level after a week shut down.

José   

[Magnum]

Quote: edgargravel

When we overhauled my engine last year, the engine shop guy did not want it reinstalled (at risk of loss of warrantee) unless there was a condensation bowl put in the return line.  It works and catches condensate on the way back.  The brown stuff in the bowl that we drain during our 25 hour oil changes is actually a mixture of oil and water.

[Gone]

As soon as I get the other hard drive working, I will take and post a picture here.

I still owe some folks the scans of Amelia's 3" rudder pedal extension drawings as well.

[Piloto]

Does the oil return line in your installation go to the rocker cover on the left or right side of the engine? On the left side the oil cooler is in the way?

[Magnum]

Quote: Piloto

Does the oil return line in your installation go to the rocker cover on the left or right side of the engine? On the left side the oil cooler is in the way?