Firewall "oilcaning"

[Lew Danforth]

My rv4's firewall down by the left gear leg attach point has begun to oilcan and make noise when i taxi over bumps, not large ones either. Not allways, but is getting tiresome. Anybody else out there experienced this? Any ideas how to fix the problem? Thanks! Lew













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[szicree]

I'd be concerned if it has never done it before and all of a sudden began. In particular, you may want to carefully inspect the weldments on the interior four corners of the firewall.

 

[Neal@F14]

I'd be concerned if it has never done it before and all of a sudden began. In particular, you may want to carefully inspect the weldments on the interior four corners of the firewall.

Especially the lower weldments. Another couple symptoms of a cracked weldment on an RV-4 include an increase of engine/prop vibration felt thru the plane while in flight despite a dynamic prop balance job done on the ground showing near perfect balance. Also does the spinner position against the cowl show any sign of the engine sagging down a wee bit?



And BTW, I just noticed this is your first post....

Welcome to the VAF Forums, Lew!