REFLECTOR: "Stuck" Franklin

[Brian Michalk]

Spray some Marvel Mystery Oil in the cylinders and let it sit for a few 
days.

On 02/03/2014 11:34 PM, Hiroo Umeno wrote:
>
> Franklin Experts,
>
> We are just starting to re-activate an aircraft that has sat for 7 
> years in a hangar storage.  When we flew it last, the aircraft flew 
> well and the engine performed as expected.  This an installation on a 
> Velocity and it has the oil cooler bypass fix that was needed to 
> operate at proper oil temperature.
>
> The engine is a PZL built 6A-350 that has approximately 27 hours since 
> major overhaul / rebuild.  The aircraft has engine driven fuel pump 
> and dual slick magneto ignition (no electronic ignition).
>
> When we pulled the plugs off and attempted to hand turn the prop, we 
> discovered that the prop will not complete the full turn. Rather, 
> there is a definite stop point at 180 degree rotation in either 
> direction.  Inspection of the cylinders reveal no piston contact with 
> valves and no obvious blockage.  No new parts have been installed 
> since it was last operated.
>
> I am wondering if there is a "likely suspect" that we should look at 
> first.
>
> Hiroo
>
>
>
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