Leaking Rocker Covers - DON'T OVER-TIGHTEN

[wslade2]

Or the opposite: I was concerned about over tightening back in the winter. Replaced some old looking silicone valve cover gaskets. Put them on “snug” but not “tight-tight”. After some high speed taxi testing for brake work, a failed vacuum pump (for my OEM AI for my 400 autopilot) made me take the cowling off. Surprised to find a puddle of oil built up on the muffler, multiple liquid ounces. A fire begging to happen. Ran again after hand tightened more. Still leak. In short, problem wasn’t fixed until I used an inch pound torque wrench. Always use torque device with the silicone gasket or you might be surprised by oil loss or worse.

[wslade2]

PS-the leak didn’t show up at first with run ups. It only manifested itself with high speed taxi probably because that induces the full cacophony of vibration and pressures of takeoff.

[mshac]

Originally Posted by wslade2

PS-the leak didn’t show up at first with run ups. It only manifested itself with high speed taxi probably because that induces the full cacophony of vibration and pressures of takeoff.

That's scary. I'll definitely do a high speed taxi and re-check for leaks before going flying.