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Gerard, you should also check your engine
mount. When my 235 was nearly new (1995), it developed severe nose
wheel shimmy on roll out. The strut was sent back to Esco for a anti
shimmy mod. Unless your strut is very old, it probably already has this
mod. In addition, the short cross piece above the strut pivot points
on the engine mount was found to be cracked at both ends. I had a new
cross piece of thicker-walled tubing welded in the mount and now have over 500
hours on the plane with no shimmy.
Scott, thank you for your response.I ha
passed on your sugestions to thelocal mechanics. Vern also feels it is most
likely a sequence valve issue. Replacing the valve seemed to temporarily
correct the problem but this was short lived. It has also been suggested by an
Australian builder that perhaps the nose wheel precesses slightly with
gyroscopic force during retraction and thus is at a slight angle different to
when on the ground and thus does not depress the valve. I don't have the self
centering nose wheel mod. The suggestion was to check the bearings for wear +
play in the nose wheel. On landing, I have noticed some "judder" or
shimmy during my roll out. This would be consistent with worn bearings would
it not? The judder was improved a little by a new drag link but has far
from
disappeared altogether.
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