> Haven't seen another response to this yet, so I'll toss out three cents.
>
> I have not read an authoritative analysis of all of the causes of spinner
> and backplate cracking. On the assumption that the parts are correct for
> the application and are properly made, I suspect three primary factors, in
> this order:
> (A) Badly unbalanced prop (includes an unbalanced spinner)
> (B) Improperly fitted/installed prop and spinner combo
> (C) Internal engine imbalance
>
> My belief is that Beech requires replacement of spinners and bulkheads as
> a balanced assembly; a practice that is apparently widely ignored.

*** And indeed, Beech does list individual parts.

There
> is normally a set of index marks (or index labels) inside the spinner and
> on the bulkheads, showing how to orient them during assembly to retain
> balance. I don't know whether a spinner shop like ASEI

*** I just got my spinner back from ASEI. The original marks and painting
on the inside of the spinner seem to be intact.

> The spinner is (normally) supposed to be a snug fit over the bulkheads.
> It should almost require some hand-slapping to get the holes to line up.
> This is also true of spinners on Hartzell constant-speed props, where the
> prop dome serves as the front bulkhead pilot. Heavy-duty Mylar packing
> tape (like the premium 3M brand) can be used for shimming out clearances.

*** How about teflon anti-chafe tape? I just happen to have a roll of this.

many of the spinners are supposed to have Nylon washers under the heads
of the spinner screws.

*** My understanding is that the washers are actually fiber. I just went
across the street to the Cessna store and asked for 22 "#10 Spinner
Washers". I would have ordered the Beech part, but there is none in the
parts list.

- Jerry Kaidor ( jerry@tr2.com )




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