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Skyking
My parts book shows the metal seals or gaskets are used on s/n's 33701816 thru 33701907. the part #'s are AN901-6A and AN901-4A.
Also I have seen the butterfly valve in the wastegate become loose on the actuator shaft and would cause the manifold pressure to ossilate @ 4 in's eather way.
I just replaced a controller on one of our aircraft about 3 weeks ago because I just could not adjust it. Iwould have 30 in's or 38 in's nothing in between.
Hope this helps.
Kim
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