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More data on that IO 720

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philipguziec(at)yahoo.com
Guest

Posted: Mon Aug 02, 2010 3:53 pm Post subject: More data on that IO 720

Oil looks clean with no chips in the filters or screens.  Just starting oil 

analysis, so no data there.



Thanks again,

PHil

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hcourier(at)cox.net
Guest

Posted: Mon Aug 02, 2010 6:49 pm Post subject: More data on that IO 720

I flew a commander, 680FLP with the IO-720s for 1,100 hrs.  Oil pressure on 

both engines was always at the bottom of the green at idle and at cruise 

after it warmed up.  Never had the prop problem, however the plane I flew 

didn't have a prop accumulator.  You might look there, and since the 

accumulator was just overhauled seems that's what might be the culprit.



--------------------------------------------------

From: "Philip Guziec" <philipguziec(at)yahoo.com>

Sent: Monday, August 02, 2010 6:53 PM

To: <commander-list(at)matronics.com>; <mooney(at)aviating.com>; 

<mooney-tech(at)aviating.com>

Subject: More data on that IO 720



 	  Quote: 	
		   

 <philipguziec(at)yahoo.com>



 Oil looks clean with no chips in the filters or screens.  Just starting 

 oil

 analysis, so no data there.



 Thanks again,

 PHil

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yourtcfg(at)aol.com
Guest

Posted: Tue Aug 03, 2010 7:37 am Post subject: More data on that IO 720

HELLO PHIL....There is nothing unique about the 720 oil system, it is the same as most direct drive lycs.  If the O.P. is low at idle (or any RPM) and the adjustment spring cant compensate for it, The engine is bypassing oil.  Usually, the OP will be high (to high) when the oil is cold, and then drop  off with the rise in temp.  No good news here.  Probably camshaft bearing to engine case clearance??  How much TSOH?  Could be the seat that the op ball sits in.  These can be changed fairly easily, or the ball itself??  I have run GSO-480s many hours with this malady, I even used 120 weight oi to help outl, and the engine did not expire.  My propeller did work normally. 

    Assuming the propellers are steel clamp, counterweighted Hartzells, there is a large spring that takes the blades to high pitch/ feather.  If the propeller does not get enough engine op, it cannot come out of high pitch or feather.  sorry, but it sounds like an engine problem to me.

   jb

   

 

 

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