Mailing List lml@lancaironline.net Message #18326
From: Metcalfe, Lee, AIR <Lee.Metcalfe@jocoks.com>
Sender: Marvin Kaye <marv@lancaironline.net>
Subject: RE: [LML] Re: IO-320 / Hartzell Prop Strange RPM Behavior (Long)
Date: Tue, 01 Apr 2003 22:00:02 -0500
To: <lml>
Message
Larry:
 
We thought about the cable being the problem... it is pretty taught.  It originally was just Adel-clamped to the forward-most pushrod tube!  You could move it fore and aft about 1/4"!  The A&P fabricated a bracket that is attached to the governor.  The business end of the cable is now clamped to that bracket with the proper cable-end clamp.  The cable sheath cannot be moved.  But I guess it's still possible that the sheath is stretching as the engine torques counter-clockwise (left side down) and as is pulled out and down by the prop load.  I can see how there could easily be several 1/10ths of an inch (or more!) of displacement that could have the effect of shortening the control cable.  We'll have to take a closer look at that!
 
Re some obstruction in the oil lines, every oil passage in the engine should have been cleaned out when the case was sent out to be inspected for damage from the prop strike.  When we got it back it had obviously been through a thorough cleaning.  The governor was newly overhauled and the prop was brand new.  Seems to me all oil passages should have been wide open.
 
Lee
 
BTW:  S'n'F just doesn't fit in my schedule, but I WILL be going to Suffolk!
 
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