Matronics Email Lists :: View topic - Lycoming GO480 RPM and Oil Pressure Problem

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

Lycoming GO480 RPM and Oil Pressure Problem

Matronics Email Lists Forum Index -> Commander-List

View previous topic :: View next topic

Author Message

blbarron(at)bellsouth.net
Guest

Posted: Sun Jun 17, 2007 7:12 pm Post subject: Lycoming GO480 RPM and Oil Pressure Problem

To All,



  I recently experienced an inadvertent change in RPM on takeoff that caused

my gearbox to chatter. I was at full throttle with prop set at high RPM and

about 1500 feet down the runway when it happened. To late to abort so I

adjusted the prop to a lower RPM to stop the chatter and to make the engine

drive the prop again. With enough altitude to go around and land, I put the

nose down and tried to adjust the prop again and it started to chatter

again. After the adjustment, it stopped. After landing and coming to a

complete stop, I ran it up to 3200 RPM and the gearbox started to chatter

and the RPM dropped to about 2900 RPM. 



  I shut it down and removed the prop governor and sent it for overhaul.

After overhaul and reinstallation I ran it up to 3200 RPM and again it

dropped by itself to about 2900 RPM.



  The only other thing different in the performance of the airplane recently

is that the oil pressure seems to be getting lower. It has run at 60 PSI in

cruise for the past 15 years and now with the oil temp at 187 degrees F the

oil pressure is showing about 55 PSI. At 3200 RPM the oil pressure is at 67

PSI which should be more than enough pressure to run the prop, but the RPM

keeps dropping without me making any adjustment. The prop is a Hartzell

HC-A3MVF-2A and it was disassembled, inspected, serviced and reassembled by

a prop shop in November of 04.



  Has anyone else had a similar experience with RPM or oil pressure on this

type of engine? The engine has 1200 hours SMOH.



Any comments would be appreciated.



Paul W

- The Matronics Commander-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Commander-List

YOURTCFG(at)aol.com
Guest

Posted: Mon Jun 18, 2007 3:37 pm Post subject: Lycoming GO480 RPM and Oil Pressure Problem

In a message dated 6/17/2007 8:13:00 PM Pacific Daylight Time, blbarron(at)bellsouth.net writes:

  	  Quote: 	
		    Has anyone else had a similar experience with RPM or oil pressure on this

type of engine? The engine has 1200 hours SMOH. 	


 The seals in the gearbox are probaly worn out allowing oil to bypas.  With low oil pressuer the prop will attemt to feather, henc low RPM.  Sorry for the bad news, but that is probaly it.  jb



See what's free at AOL.com. 

  [quote][b]

- The Matronics Commander-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Commander-List

blbarron(at)bellsouth.net
Guest

Posted: Mon Jun 18, 2007 5:26 pm Post subject: Lycoming GO480 RPM and Oil Pressure Problem

JB,

  

   Thanks for the bad  news. It's better than not knowing.

  

 Paul



   From: owner-commander-list-server(at)matronics.com  [mailto:owner-commander-list-server(at)matronics.com] On Behalf Of  YOURTCFG(at)aol.com

Sent: Monday, June 18, 2007 6:36 PM

To:  commander-list(at)matronics.com

Subject: Re: Lycoming  GO480 RPM and Oil Pressure Problem

 

  In a message dated 6/17/2007 8:13:00 PM Pacific Daylight Time,  blbarron(at)bellsouth.net writes:

  	  Quote: 	
		    Has anyone else had a similar experience with RPM or oil    pressure on this

type of engine? The engine has 1200 hours  SMOH. 	


 The seals in the gearbox are probaly worn out allowing oil to bypas.   With low oil pressuer the prop will attemt to feather, henc low RPM.  Sorry  for the bad news, but that is probaly it.  jb



   See what's free at AOL.com.  

[quote]



href="http://www.matronics.com/Navigator?Commander-List">http://www.matronics.com/Navigator?Commander-List

href="http://forums.matronics.com">http://forums.matronics.com



[b]

- The Matronics Commander-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Commander-List

Display posts from previous:

	Matronics Email Lists Forum Index -> Commander-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum