Europa-List: Re: Engine mount bolt loosens

["Area-51" <goldsteinindustrial@gmail.com>]

--> Europa-List message posted by: "Area-51" <goldsteinindustrial@gmail.com>

All valid; points noted. 

On occasion have found bolt has loosened and departed the airframe leaving 
three secure in place. Why does the bolt loosen? Vibration and the sum total of 
heat expansion and contraction cycles of individual components. Check the flat 
washer used under the cap screw heads; they should be hardened washers under 
the spring washers.

I now make it a routine item at 25hrs to check the torque on all 4 engine to 
crankcase frame bolts. Clean the thread well with brake clean and compressed 
air before refitting. Ensure the spacer block between crankcase and engine 
frame has been fitted during installation; visual inspection with light and 
mirror. it cannot come out even if bolt departs the frame.




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=515173#515173






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