Lycoming 4cyl

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MaxxForce
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Lycoming 4cyl

Post by MaxxForce » Sat May 25, 2019 3:43 pm

I am looking at buying a boat with a 4 cylinder Lycoming on it but it has no data plate on it and I have no idea what engine it is I have pics on my phone but don't know how to post them can I send them to someone to post for me and figure out what engine it is?
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Slidin Gator
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Re: Lycoming 4cyl

Post by Slidin Gator » Sat May 25, 2019 5:12 pm

I grew up thinking I-10 was the Mason Dixon line.
1986 Airboat Engineering Inc., 14' Marsh Master. Refreshed narrow deck, SV O-540, 72” NGQ. A Bob Stossel original.

MaxxForce
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Re: Lycoming 4cyl

Post by MaxxForce » Sat May 25, 2019 5:58 pm

I saw that thread but I don't think it's a 0320 or 0360 I think it's a 0290 I'm just not for sure .
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John Fenner
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Re: Lycoming 4cyl

Post by John Fenner » Mon May 27, 2019 7:52 am

Go to full editor&preview button, scroll down click on attachments and click add files choose the picture from the folder you have it in, the bar will light green if file isn't too big, if it says too big in red, just crop the picture and save it, try again.
I never finish anyth,,,.

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John Fenner
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Re: Lycoming 4cyl

Post by John Fenner » Mon May 27, 2019 8:00 am

Ok, that said, the cylinder hold down nuts, internal or external hex, plates under internal hex, or just nuts to flange, 4 =1/2 and 4 =3/8 studs?
I never finish anyth,,,.

MaxxForce
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Re: Lycoming 4cyl

Post by MaxxForce » Mon May 27, 2019 10:24 am

Trying to add pics thanks for the help .
Attachments
IMG_4077.JPG
IMG_4073.JPG
IMG_4070.JPG
IMG_4069.JPG
IMG_4066.JPG
DONT RETREAT JUST RELOAD!!!

MaxxForce
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Re: Lycoming 4cyl

Post by MaxxForce » Mon May 27, 2019 6:45 pm

External hex, 4-3/8, 4-1/2"
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John Fenner
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Re: Lycoming 4cyl

Post by John Fenner » Tue May 28, 2019 8:34 am

O-290 GPU, has a flange under the flywheel I'm sure.
I never finish anyth,,,.

MaxxForce
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Re: Lycoming 4cyl

Post by MaxxForce » Tue May 28, 2019 10:47 am

Thanks for the info, what horsepower is it 125?
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John Fenner
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Re: Lycoming 4cyl

Post by John Fenner » Wed May 29, 2019 9:10 am

Yes
I never finish anyth,,,.

MaxxForce
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Re: Lycoming 4cyl

Post by MaxxForce » Fri Jul 12, 2019 10:12 pm

I bought this boat with a 0290 on it and it came with some extra parts like cylinders and pistons but the cylinders are different than my 0290 cylinders can anyone tell me what they are?
Attachments
IMG_4239.JPG
IMG_4238.JPG
IMG_4237.JPG
IMG_4236.JPG
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Slidin Gator
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Re: Lycoming 4cyl

Post by Slidin Gator » Sat Jul 13, 2019 8:07 pm

John Fenner wrote:O-290 GPU, has a flange under the flywheel I'm sure.
John,
I'm curious, what are you seeing in the pics that say this is a 290? Valve covers and external hex nuts look like a wide flange 320 or 360 to me. I'm not sure about the oil pan.

The valve cover on the spare cylinder matches the O-435/290 style.
I grew up thinking I-10 was the Mason Dixon line.
1986 Airboat Engineering Inc., 14' Marsh Master. Refreshed narrow deck, SV O-540, 72” NGQ. A Bob Stossel original.

twister69z
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Re: Lycoming 4cyl

Post by twister69z » Sat Jul 13, 2019 9:37 pm

The 90 degree fitting on the oil drain back line is only on 235-290-435 cylinders.
So it is 290
If you don't have time to do it right the first time ,
Where are you going to get the time to do it a second time?

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Slidin Gator
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Re: Lycoming 4cyl

Post by Slidin Gator » Sun Jul 14, 2019 7:41 pm

Thanks Twister.
I grew up thinking I-10 was the Mason Dixon line.
1986 Airboat Engineering Inc., 14' Marsh Master. Refreshed narrow deck, SV O-540, 72” NGQ. A Bob Stossel original.

MaxxForce
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Re: Lycoming 4cyl

Post by MaxxForce » Sun Jul 14, 2019 8:54 pm

So do y'all think the spare cylinders I got are 435 cylinders, if so what is involved in putting them on my 290 ?
DONT RETREAT JUST RELOAD!!!

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John Fenner
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Re: Lycoming 4cyl

Post by John Fenner » Mon Jul 15, 2019 1:14 pm

Flange under flywheel, or belhousing flange for a better term.
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Slidin Gator
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Re: Lycoming 4cyl

Post by Slidin Gator » Mon Jul 15, 2019 9:03 pm

John Fenner wrote:Flange under flywheel, or belhousing flange for a better term.
You got the eye for sure! I see it now.
MaxxForce wrote:So do y'all think the spare cylinders I got are 435 cylinders, if so what is involved in putting them on my 290 ?
Maxx, 435 is the 6 cylinder version of the 290. Chances are that the cylinders are interchangeable. The pistons may not be, depending on compression ratio. Note that the valve covers are my only basis for the 290/435 diagnosis on the spare cylinders, so take this with a grain of salt, but it is very likely the guy you bought it all from had those as spares for a reason.

Since valve covers are interchangeable, Ignore the different valve covers and compare them otherwise to determine if they are the same. The first two items to compare are the hole pattern diameter on the flange and the cylinder height. Measure the cylinder bore and post what you find.
I grew up thinking I-10 was the Mason Dixon line.
1986 Airboat Engineering Inc., 14' Marsh Master. Refreshed narrow deck, SV O-540, 72” NGQ. A Bob Stossel original.

MaxxForce
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Posts: 81
Joined: Wed Sep 02, 2009 9:30 pm
Location: Ocala FL

Re: Lycoming 4cyl

Post by MaxxForce » Mon Jul 15, 2019 10:09 pm

Cylinder height is the same , I don't have a way to accurately measure the bore but they appear to be the same cylinders that are on my 290 so I believe you are right they are just a set of extra cylinders, I appreciate the help.
DONT RETREAT JUST RELOAD!!!

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Slidin Gator
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Re: Lycoming 4cyl

Post by Slidin Gator » Tue Jul 16, 2019 9:38 pm

Standard bore is 4.875" I believe. The cylinders may be over bored or chrome'd back to spec, all of which drives piston and ring selection. You will need to confirm what you have to know what to do with it.

Good luck!
I grew up thinking I-10 was the Mason Dixon line.
1986 Airboat Engineering Inc., 14' Marsh Master. Refreshed narrow deck, SV O-540, 72” NGQ. A Bob Stossel original.

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