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Date:  9-3-2013
Number of Hours:  2.00
Manual Reference:  
Brief Description:  Aircraft systems - 06

Next I installed the brake reservoir on the firewall. A simple task of drilling three holes. However after drilling the holes, and getting the reservoir fitted the way I wanted, I noticed the input flange was bent (see image two.) I don't know if it came bent, or if I dropped it, but it is definitely a no go. There is no way that will hold pressure, so the only alternative is ordering a new one.

You may notice a steel washer around the flange in image 2. I was looking at options for sealing the hole around the flange. A 7/16" hole was too small and the 1/2" hole is a little too large. In any event the hole must be sealed to prevent carbon monoxide from entering the cabin. This is true of all openings in the firewall. The second issue is in the event of an engine fire you want something that will withstand the high temperatures generated while landing.

The engine side of the firewall will be covered with Fiberfrax, an insulating fiber that will be wrapped in stainless steel foil. That is the heat barrier to protect the occupants. For the openings I will chemically close them with a firewall sealant CS 1900. The steel washer is a third barrier that will be riveted to a washer on engine side.
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Firewall side

Firewall side

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Engine side

Engine side

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