REFLECTOR: "Stuck" Franklin

[Laurence Coen]

Hiroo,

I still suspect a stuck valve.  If you turn the engine to the stop point and check which pistons are in the up position and remove the valve covers on those cylinders you can check the rockers to see if the valves are fully retracted.  The only thing in the engine that happens at 180 deg. rotation is the crank and what is attached to it (pistons).  Since you have pulled the plugs, it can't be hydraulic lock.

Larry Coen
N136LC
Franklin/IVO


From: Hiroo Umeno 
Sent: Monday, February 03, 2014 11:34 PM
To: Velocity Aircraft Owners and Builders list 
Subject: REFLECTOR: "Stuck" Franklin


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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