'As the angry villagers chanted in "Young Frankenstien"......
"KILL THE MUNSTER!!!!!"
Most of these trunnions have rec'd hamfisted bandaid "fixes" over
the
years. The first temptation is to dress the mating faces to "shrink"
the I.D. While this does magically reduce the clearance, the diameter
is no longer that...a diameter. It's now a football shape, and the
fore
and aft slop is still there, the direction to which the strut
receives
most stress. It is a bit like grasping a tube between thumb and
forefinger rather than wrapping the finger fully about the tube. It
will work for a while, but the Munster is still alive. Now the faces
to
which the draglink mate to are too narrow and unless shimmed
accordingly, will bind down the ears on draglink when the Alemite
screws are tightened. We all have those special shoulder screws in
don't we? We've seen several without. Do not dress these faces unless
you or your subordinate have a full grasp of the impact this has, or
posess solid machine skills. If the faces were dressed non parallel
to
the bore axis, the thru screws will bind (Yes, they are screws, there
are virtually NO bolts on an aeroplane), if there were slop in the
vertical axis, it will now bind, and now the drag link screw holes
will
no longer be on a common axis throwing undue stresses on the link
ears
as the link works about it's hinge motion. You will find yourself
creating more problems and not be aware of it. A thorough study of
the drawing ( thanks to Jaime) is an absolute, look before you leap.
All this really doesn't tell you how to fix the trunnion does it? It
really states what not to do.
--- In
fairchildclub@yahoogroups.com, "lenwmiller"
wrote:
>
> We have N81271 in our shop for an annual and a few other items.
One
> is a tail wheel shimmy. It appears to be possibly excessive axial
> play between the P/N 4388-3 trunnion and the P/N43168 Collar. Any
> ideas as to a fix? It pppears that most of the wear is in the
bronze
> trunnion which I'm sure are extremely scarce. Any help would be
> greatly apreciated!!
> Len Miller Jet West - Reno, Nv.
'