Hi Chris:
Fun isn't it?
The 914 engine is simple as engines go, there are really only a few moving parts, though the valves themselves (if whole)are unlikely to be blocking anything.
Did your engine experince a catastrophic failure before it was laid up?
Does the problem occur once per ENGINE revolution, or once per two engine revolutions? (use the fan as a reference, or calculate from the reverse gear ratio)
Dave
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