Help locating my Oil Leak (photos) or is it normal?

[N601RX]

The drilled hole is a specific size and specific distance from the bottom. I'm clueless as to the logic of this one, but it is the result of an AD that only affects planes that has bladders. Rags, I also noticed your fuel line exits the firewall fitting and goes downward creating a low spot in the bottom of the loop for water to collect. It should exit at the 10 o'clock position to eliminate the low spot. See SB 20-166.

[Ragsf15e]

Thanks, I'll take a look at the SB.

[Bob_Belville]

I just realize we went though this on a thread I started in March:

 

http://mooneyspace.com/topic/11509-crank-case-vent-hose/

 

http://rgl.faa.gov/R...FILE/042504.pdf

 

The AD really was about water in bladder equipped planes. Somehow the adding of the hole to the breather hose was among the required steps to be taken. The FAA never explained what the connection was supposed to be. See comment issue 4 on page 4 of the AD.

 

From the AD 

       Evaluation of this problem shows that improper installation of the fuel bladder drains and fuel caps could allow rainwater to enter the fuel bladders if the fuel cap was defective. The evaluation also revealed additional installation problems and design deficiencies, including:

 

–Inadequate installation of the foam filler that supports the fuel bladders;

–Inadequate engine crankcase breather vent and primary fuel vent ice protection; and

–Fuel caps that have the sealing surface below the fuel tank opening. 

 

Here's the action to be taken:

(iii) Drill a vent hole to prevent icing of the engine’s crankcase breathers; and 

[Bob_Belville]

Bob I heard both reasons as well. I tend to believe the venturi effect theory.

The AD, that I had forgotten about, mentions ice.

[N601RX]

Thanks, I'll take a look at the SB.

You will have to remove the exhaust cavity cover to rotate it. It is connected to aluminum tubing on the back side so don't let anyone try to twist it without loosening the flare nut on the aluminum tubing.