220 GPU cylinder install

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diesel250r
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220 GPU cylinder install

Post by diesel250r » Fri Nov 28, 2014 1:56 pm

I just received my cylinders back from being overhauled and want to assemble my engine I've been reading the assembly manual and need some clarification it said to install cylinder nut locks hand tight then one turn I didn't take any locks off also only some of my cylinder nuts had a Starr shaped assuming lock washer under the nut does any one have a picture or maybe a better description of what I need to do to get this motor back up and running also a good description of break in for this motor

GMAC 76
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Re: 220 GPU cylinder install

Post by GMAC 76 » Fri Nov 28, 2014 2:34 pm

one thing for sure NO LOCK WASHERS!......most of the airboat guys don't put the little lock nuts on...I think that is more of an aircraft thing with continential...Lycoming engines don't use them.at all

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Re: 220 GPU cylinder install

Post by thirtysix420 » Fri Nov 28, 2014 3:18 pm

Nut locks are on it when it has never been apart. Once an airboat guy works on it they don't put em back on. U don't need em. They go on after the nut. Good luck


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diesel250r
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Re: 220 GPU cylinder install

Post by diesel250r » Fri Nov 28, 2014 4:13 pm

Thanks for the replies but it's not going back together found slop in #1 rod bearing the only number I can find is 530383 is that a standard bearing looking for opinions now overhaul completely and try to find parts.sell what I have and find another motor like a 470 its,a new boat to me first one and getting expensive before I see water

diesel250r
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Re: 220 GPU cylinder install

Post by diesel250r » Sat Nov 29, 2014 9:25 am

The bearing
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2014-11-29 09.23.23.jpg

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goldhunter_2
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Re: 220 GPU cylinder install

Post by goldhunter_2 » Sat Nov 29, 2014 9:47 am

most airboat guys don't put the lock nuts back on I am guilty of that myself, but check the main nuts several times during the first few hours to make sure they don't back off . Those star washers under the nuts probably means someone has replaced the standard flared nuts with common nuts and star washers they will work but you would be better with the factory nuts they are the same flared nuts on the gpu 220, pe90, pe200, o470, o520, o550

those rod bearings are way past junk, how bad do the journals look ? if you haven't done it already pull the crank the main bearings they probably need replacing as well and with that rust I'm guessing you may want to polish the cam to
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diesel250r
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Re: 220 GPU cylinder install

Post by diesel250r » Sat Nov 29, 2014 10:33 am

The crank shafts rod journals are grooved just like that bearing it had in out slop that's the only one but I haven't pulled the others the crank I'm sure will have to be cut I don't want to dump more money into a bad crank if I just slapped bearings in it and let it eat or do you think that's a bad idea

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Re: 220 GPU cylinder install

Post by goldhunter_2 » Sat Nov 29, 2014 3:49 pm

if the journals are "grooved" you will need to have it turned at a aircraft shop not auto shop ............ still cheaper then another crank
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cowtown
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Re: 220 GPU cylinder install

Post by cowtown » Sat Nov 29, 2014 3:56 pm

goldhunter_2 wrote:if the journals are "grooved" you will need to have it turned at a aircraft shop not auto shop ............ still cheaper then another crank
What's wrong with a auto shop , I know when I did machine work daily , we turned aircraft cranks weekly
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diesel250r
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Re: 220 GPU cylinder install

Post by diesel250r » Sat Nov 29, 2014 5:03 pm

Well now I'm going full overhaul I want power of course but more into it lasting me or if I sell it I don't want the person who bought it to get screwed like I did I'm sure the motor would of ran just fine the way it was for a little while but probably would of ended up beyond repair when it failed I'm scared with all the talk about cranks snapping on turned cranks if thats what i shpuld do right now it has a 5 blade 70 in warp drive I just had redone but I know I'm putting a q on it or a wide 2 blade in the future and don't know how much more stress that might put on it my goal with this boat is run dry and keep up with with my 540 buds I like to pull my own weight and not be rescued or slow down the group on the way to a blind

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Re: 220 GPU cylinder install

Post by cowtown » Sun Nov 30, 2014 8:53 pm

If they make a bearing for it it is safe to do , most auto machine shops don't use a radius gauge on the journals , but some do , and that is the key to turning a gpu crank , or any crank for that matter
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