Gso-480 oil pressure problems

Aircraft powered airboat discussion.
Post Reply
Chaos6.0
Southern Airboat Member
Posts: 5
Joined: Mon Apr 16, 2012 2:16 pm

Gso-480 oil pressure problems

Post by Chaos6.0 » Fri Oct 14, 2016 6:52 pm

Cold idle is between 85-90 and when the oil gets hot the pressure is about 6-9 pounds. Just put a new oil pump in and nothing changed. Engine runs good and makes no weird noises while running. When i changed the oil there was no metal shavings or flakes in the oil so i wouldn't think it would be the main bearings. Any ideas or suggestions

Outlawaircraftengines
Site Supporter - I
Site Supporter - I
Posts: 1019
Joined: Mon Sep 04, 2006 9:49 pm
Location: Plant City
Contact:

Re: Gso-480 oil pressure problems

Post by Outlawaircraftengines » Sat Oct 15, 2016 9:33 am

Check Gauge. If that is true pressure, its way low and you have a problem. Main or rod bearings, worn crank, or worn case in cam journal area
Gary Barber
Outlaw Aircraft Engines
www.outlawaircraftengines.com
863-698-0383

Chaos6.0
Southern Airboat Member
Posts: 5
Joined: Mon Apr 16, 2012 2:16 pm

Re: Gso-480 oil pressure problems

Post by Chaos6.0 » Sat Oct 15, 2016 9:46 am

Ok thanks for the info

User avatar
kwanjangnihm
Site Supporter - IV
Site Supporter - IV
Posts: 1963
Joined: Sat Mar 30, 2013 8:23 pm
Location: Bartow FL

Re: Gso-480 oil pressure problems

Post by kwanjangnihm » Sat Oct 15, 2016 11:10 am

Chaos did you just purchase the engine? How many hours on it? Any other info on engine you know of? Oil temp?
A few other things, is there enough oil to circulate the system, is the oil cooler warm/hot, have you checked/cleaned relief valve, strainers or vernatherm for obstructions, checked/cleaned suction or pressure lines, oil pump intake obstruction. (just throwing this out there)

Are you near any qualified AC mechanics?

Gary gave good input if it is a worn engine. :thumbleft:
" I don't care who you are back in the world, you give away our position one more time, I'll bleed ya, real quiet. Leave ya here. Got that? "

User avatar
nunook
Southern Airboat Member
Posts: 130
Joined: Wed Oct 22, 2008 10:37 pm
Location: Loxahatchee

Re: Gso-480 oil pressure problems

Post by nunook » Sun Oct 16, 2016 10:29 pm

I had the same problem with mine, as the oil thinned I would lose pressure and the oil temp would raise. I pulled the motor to replace the rod bearings which weren't in bad shape so I replaced the mains as well. They were a little worn but not bad. What I did find where three out of the six Cylinder Cooling injectors (oil injectors) were faulty, There is a check valve which appears to open at a particular pressure but were free flowing oil into the cylinders off the main oil journal continuously.
2006 Floral City 14' Deckover Lycoming GSO-480

Chaos6.0
Southern Airboat Member
Posts: 5
Joined: Mon Apr 16, 2012 2:16 pm

Re: Gso-480 oil pressure problems

Post by Chaos6.0 » Mon Oct 17, 2016 8:04 am

Thanks

chases pee paw
Southern Airboat Member
Posts: 9
Joined: Tue Mar 01, 2016 5:18 pm

Re: Gso-480 oil pressure problems

Post by chases pee paw » Mon Oct 17, 2016 3:56 pm

nunook wrote:I had the same problem with mine, as the oil thinned I would lose pressure and the oil temp would raise. I pulled the motor to replace the rod bearings which weren't in bad shape so I replaced the mains as well. They were a little worn but not bad. What I did find where three out of the six Cylinder Cooling injectors (oil injectors) were faulty, There is a check valve which appears to open at a particular pressure but were free flowing oil into the cylinders off the main oil journal continuously.
Would this apply to a straight valve 540 carb motor?

Outlawaircraftengines
Site Supporter - I
Site Supporter - I
Posts: 1019
Joined: Mon Sep 04, 2006 9:49 pm
Location: Plant City
Contact:

Re: Gso-480 oil pressure problems

Post by Outlawaircraftengines » Wed Oct 19, 2016 8:17 am

yes it would apply
Gary Barber
Outlaw Aircraft Engines
www.outlawaircraftengines.com
863-698-0383

chases pee paw
Southern Airboat Member
Posts: 9
Joined: Tue Mar 01, 2016 5:18 pm

Re: Gso-480 oil pressure problems

Post by chases pee paw » Mon Oct 24, 2016 3:33 pm

Outlawaircraftengines wrote:yes it would apply
Would that explain high oil consumption without lots of blow by or smoke and does the case have to be split? How can I determine that would be the issue?

Outlawaircraftengines
Site Supporter - I
Site Supporter - I
Posts: 1019
Joined: Mon Sep 04, 2006 9:49 pm
Location: Plant City
Contact:

Re: Gso-480 oil pressure problems

Post by Outlawaircraftengines » Tue Oct 25, 2016 2:48 pm

Case would need split to properly diagnose the problem.
Gary Barber
Outlaw Aircraft Engines
www.outlawaircraftengines.com
863-698-0383

Post Reply

Return to “Aircraft Power Only”