REFLECTOR: "Stuck" Franklin

Tue Feb 4 09:34:53 CST 2014

check for hydraulic lock.   Remove the bottom plugs to drain any oil that may have accumulated on top of  the cylinders.
Burrall

www.freeflightcomposites.com

From: Brian Michalk 
Sent: Tuesday, February 04, 2014 7:39 AM
To: Velocity Aircraft Owners and Builders list 
Subject: Re: REFLECTOR: "Stuck" Franklin

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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