REFLECTOR: "Stuck" Franklin

Grover McNair grover at mcnairperformance.com
Tue Feb 4 12:11:02 CST 2014


I would second Larry's recommendation to check for stuck valves. Depending
on how hard you pulled on the prop, you may have multiple bent valves now.

 

Grover McNair

 

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Hiroo Umeno
Sent: Tuesday, February 4, 2014 12:35 AM
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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