glenn reynolds Posted February 8, 2022 Report Posted February 8, 2022 As I bravely work to clean up the firewall forward in anticipation of the new engines arrival, I will of course be replacing the hose which runs from the crankcase breather at the oil fill down to the aluminum pipe which attaches to the firewall and is the lower end of the crankcase breather. It struck me that how this pipe is oriented and enters the slipstream under the plane would have a lot to do with: 1) it could pressurize the crankcase with ram air? 2) it could pull a vacuum by being too venturi like under the belly (yes I've checked both the anti-ice vents in the pipe and they are open) 3) be just right, and do neither one or two. There is some latitude in how the pipe clamps to the firewall and i'm not see exact specs in the service manual. I know that fuel tank vent positions on Cessna airplanes are specified in three dimensions +- 1/8 inch. I don't have much in the way of photos as the engine is removed so just the firewall and pipe remain. https://drive.google.com/file/d/195xSaEO_yL5P4O5txZF5X9En7AaAmnYW/view?usp=sharing
glenn reynolds Posted February 16, 2022 Author Report Posted February 16, 2022 Spent some time today working on the crankcase breather exit pipe. It appears that it had slipped down in it's edel clamp and might have been four inches too low. It may be that it was originally keyed into the mounting clamp with a dimple that wore out making a hole. I'll keep researching to see if the factory made two, anti-ice holes as mine has two holes or did they make one anti-ice hole and then secure to the clamp which on mine has now worn as a hole.
carusoam Posted February 16, 2022 Report Posted February 16, 2022 Two whistle holes doesn’t sound familiar… If you can’t find a drawing… we can always ask Doc…. -a-
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