Mixing box wear

[turboturner]

KF Classic IV: My airframe has over 1000 hrs. The mixing box shows some wear (play) at one of the joints. Has anyone noticed a similar problem on theirs? (presumably on high-time airframes). Has anyone replaced their entire mixing box? Thnx for any feedback. TT.

[N981MS]

Series 6 with 500 hrs at last condition inspection had similar at the pin that allows rotation for the ailerons. The one held in by a piece of bent stainless. I was surprised at how little difference there was in the worn vs replacement pins. Fixed it though.

[turboturner]

No wear on the part then, just the pin?
Thnx for the feedback Max.

[Dave F]

send me some pics or videos of this looseness.


Some enlarged holes can be repaired.

it is a bolt , rod end or solid piece that is worn?

[N981MS]

I noticed "unusual" movement on inspection. I replaced the pin only hoping it would fix it and it did. I was not excited about the prospect of replacing the whole box.

I did lube this area at every condition inspection. With Triflo I think. It is given bearing grease on assembly but I have a hard time deciding to drill out rivets to put in new grease at every inspection. Anybody got a better idea?

[t j]

The tri flow is thin and may have washed the grease out. I use a spray can of Lithium grease with the application tube on difficult to dissemble/reassemble areas where grease is used..

[turboturner]

Thnx for the offer Dave. The machine is in Quebec (hangared for the winter) & I'm here in Ont. The only pic I have is on my iPod, which I will gladly email you (see PM). You'll recognize the joint when you see it. I haven't taken it apart yet since it wasn't "loose enough" to worry me, but I really should be on it next spring. Am looking forward to hearing your comments. Maybe I can find a way to post it here for others to see.