Need help identifying a gpu

Aircraft powered airboat discussion.
roberts1984
Southern Airboat Member
Posts: 3
Joined: Mon May 14, 2018 4:41 pm
Location: Perry Florida

Need help identifying a gpu

Postby roberts1984 » Mon May 14, 2018 5:04 pm

Hi there everyone,
New to the board but not to looking around on here. I recently purchased a airboat with what I think is gpu but am unable to find any info on it. I will get a good side picture of it tomorrow. I have some leaks and also have the number three cylinder shows to have bad rings with 45psi of compression and 80% loss of leak down into crankcase. I am interested in finding parts to repair it and fix my leaks. All other cylinders checked at 125psi.

Thank you for any info and direction you can point me.
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roberts1984
Southern Airboat Member
Posts: 3
Joined: Mon May 14, 2018 4:41 pm
Location: Perry Florida

Re: Need help identifying a gpu

Postby roberts1984 » Mon May 14, 2018 5:14 pm

Here is a older side picture of the boat.
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Bigjake220gpu
Southern Airboat Member
Posts: 13
Joined: Tue May 15, 2018 1:33 am

Re: Need help identifying a gpu

Postby Bigjake220gpu » Tue May 15, 2018 1:36 am

roberts1984 wrote:Hi there everyone,
New to the board but not to looking around on here. I recently purchased a airboat with what I think is gpu but am unable to find any info on it. I will get a good side picture of it tomorrow. I have some leaks and also have the number three cylinder shows to have bad rings with 45psi of compression and 80% loss of leak down into crankcase. I am interested in finding parts to repair it and fix my leaks. All other cylinders checked at 125psi.

Thank you for any info and direction you can point me.
Looks like 220 GPU

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AirHog
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Location: Orlando & Hernando Florida

Re: Need help identifying a gpu

Postby AirHog » Tue May 15, 2018 8:22 am

It’s a PE150 packette.... the site has a folder called aircraft manuals.... GPU is a sub folder.
You can view the manual here on this site.

Pulling the cylinder is pretty easy. Remove the exhaust and intake.... pull the cylinder base nuts and slide it off. The wrist pin floats... so you just push it through the piston.

The directory will show where to get cylinders.... you want to check for pitting in your cylinder if it’s pitted.... you might want to freshen them all on that side...

Don’t forget to replace the cylinder base o-ring before you reinstall the cylinder. Replace your push rod seals also.

Finally collapse the lifter and ensure your lifter has .030 to .120 clearance.... on the base of the lobe. Sounds harder than it is. So easy a car motor guy could do it!

Good luck
AirHog
Bad decisions make good stories!
Citrus County Airboat Alliance Member

roberts1984
Southern Airboat Member
Posts: 3
Joined: Mon May 14, 2018 4:41 pm
Location: Perry Florida

Re: Need help identifying a gpu

Postby roberts1984 » Tue May 15, 2018 2:21 pm

Thank you guys for the fast reply.

Found some more bad news today after looking around and draining and checking oil filter. I have a ton of metal in the filter but it doesn't look like bearing material. is it possible metal from machining the front cover for dual mags? Is it time for a teardown and rebuild? also it doesn't make any noise while running that I can hear and oil psi is 65-70 psi while running.

I attached a few crappy scope pictures of the bad cylinder and also can anyone tell me if it looks like the cylinders have been chromed before? I don't see crosshatching it's more like cracks but they look smooth through the spark plug hole.
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diesel250rr
Southern Airboat Member
Posts: 39
Joined: Sat Apr 20, 2013 7:39 pm

Re: Need help identifying a gpu

Postby diesel250rr » Tue May 15, 2018 2:53 pm

The cracks are because it is a chrome cylinder not sure on the metal particles in the oil though I have a lot in mine but mine is copper looking and black stuff

adl
Southern Airboat Member
Posts: 38
Joined: Sun Dec 27, 2009 7:09 pm
Location: Orange City fl

Re: Need help identifying a gpu

Postby adl » Tue May 15, 2018 3:25 pm

I'll be pulling the pan to see what's in it

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John Fenner
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Joined: Tue Feb 14, 2012 12:26 pm
Location: Miami(Cuba) Fl.

Re: Need help identifying a gpu

Postby John Fenner » Tue May 15, 2018 3:34 pm

Metal looks like chips from drilling case for mag drive gear pin, which means they went through oil pump as the main pickup tube screen has been omitted, if it carries good oil pressure let it eat, hard to tell what pistons they are but might be dome top, channel chrome cylinders are a plus, rings are cheaper, my bet is that ring lands are hammered from timing too high.
I never finish anyth,,,.

smessler34
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Re: Need help identifying a gpu

Postby smessler34 » Wed May 16, 2018 7:31 pm

dont look to deep. put oil in it, run it like you stole it! they are work horses , ive been running the same gpu for 13 years and its still grinding with the best of them. oh did i mention ,put more oil in it lol. good luck

Seadrift
Southern Airboat Member
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Joined: Tue Oct 04, 2016 5:28 pm

Re: Need help identifying a gpu

Postby Seadrift » Thu May 24, 2018 3:18 pm

I think I would flush it real good before putting oil in it. J/S
2000 Combee 18' / TIO 541 Don't laff, it takes me there and brings me back.


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