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Name this Motor.... No Nameplate

Posted: Tue Apr 16, 2019 6:07 am
by Cm3gator
I have come across this motor and there isn’t a nameplate that I can find. I can see it’s a 4cyl Lycoming... just don’t know what model exactly.
:salute:


:florida:

Re: Name this Motor.... No Nameplate

Posted: Tue Apr 16, 2019 9:53 am
by GMAC 76
looks like a narrow deck straight valve 0-360 Lycoming....with a really piss poor spark arrestor set up...lol

Re: Name this Motor.... No Nameplate

Posted: Tue Apr 16, 2019 4:07 pm
by Cm3gator
That’s what i was told it was. Just wanted some validation. I really appreciate your input.

Thank you,,,,!!!



:florida:

Re: Name this Motor.... No Nameplate

Posted: Wed Apr 17, 2019 5:18 pm
by BobBrack
Could be an o-320 as well. You would need to measure the cylinder length to know for sure.

Re: Name this Motor.... No Nameplate

Posted: Wed Apr 17, 2019 6:17 pm
by rick
Found the old post below from 2010. Can someone vefify if that's the correct cylinder length difference between an O-320 & O-360.

If true that measurement would save a lot of headaches because I've seen quite a few people that were told they were getting a SV O-360 180hp when it turned out to be something else.

MJD291 wrote:MEASURE FROM THE BOTTOM OF THE CYLINDER WHERE IT MEETS THE CASE SURFACE TO THE TOP OF THE CYLINDER OR THE SURFACE THE ROCKER COVER BOLTS TO. ON A 160 IT WILL BE 10 1/2 INCHES AND 180 IT WILL BE 10 3/4 INCHES. THERE IS A 1/4" DIFFERENCE BETWEEN THE TWO.


Rick

Re: Name this Motor.... No Nameplate

Posted: Wed Apr 17, 2019 8:50 pm
by Slidin Gator
I measure 10-1/4” for the O320 and a hair over 10-5/8” on the O540 (same jugs as a O360). Both are straight valve, narrow deck.

Re: Name this Motor.... No Nameplate

Posted: Thu Apr 18, 2019 5:01 pm
by Cm3gator
Thanks Rick and Sliding Gator. That helps.....

:toothy7:

Re: Name this Motor.... No Nameplate

Posted: Thu Apr 18, 2019 8:12 pm
by Slidin Gator
Even if it did have a Nameplate, it would be on the oil pan and hard to believe after 50 years...

Upload your measurement for comparison. Here is a picture of the 320 measurement to make sure we are on the same page.

Image

Re: Name this Motor.... No Nameplate

Posted: Fri Apr 19, 2019 9:49 am
by rick
Thanks for that pic.

I have a grandson that will be looking for a boat fairly soon and I keep telling him about how important it is to learn how to id the motor yourself regardless of what's being said about it.

Rick

Slidin Gator wrote:Even if it did have a Nameplate, it would be on the oil pan and hard to believe after 50 years...

Upload your measurement for comparison. Here is a picture of the 320 measurement to make sure we are on the same page.

Image

Re: Name this Motor.... No Nameplate

Posted: Fri Apr 19, 2019 3:02 pm
by SeatCover
Can't you pull a hub bolt and tell by the size if it has an 360 crank in it?

Re: Name this Motor.... No Nameplate

Posted: Fri Apr 19, 2019 3:20 pm
by diamondback0320
An 0320 crank bolt is 7/16 isn't it & 0360 is 1/2"

Re: Name this Motor.... No Nameplate

Posted: Fri Apr 19, 2019 6:12 pm
by Slidin Gator
I can confirm that the O320 I have uses 7/16 fine thread for the prop hub. My 540 is 1/2-20, I'm not sure about the 360.

Re: Name this Motor.... No Nameplate

Posted: Fri Apr 19, 2019 7:25 pm
by Cm3gator
I went out and measured my motor this afternoon, and this is what I got.

Re: Name this Motor.... No Nameplate

Posted: Fri Apr 19, 2019 7:54 pm
by Slidin Gator
Making those the 360 jugs. Would be bad to find that she had the 320 crank, compression would be pretty damn low...

Being a new to you boat, might as well confirm the prob hub bolts when you pull the prop and hub off and clean all the threads, give them a fresh coat of never seize, and re-torque everything, no telling how long that has been. I had to drill out a set of hub bolts from a boat that had been in salt water and they never pulled the hub.

Re: Name this Motor.... No Nameplate

Posted: Fri Apr 19, 2019 9:06 pm
by Cm3gator
That would be bad.... Ill be pulling the prop in the next day or two. Updates to follow....

Re: Name this Motor.... No Nameplate

Posted: Mon May 06, 2019 6:48 pm
by DHam
Is there a difference in the 320 and 360 case or is it all all n the guts?

Re: Name this Motor.... No Nameplate

Posted: Thu May 23, 2019 3:27 am
by Cm3gator
I guess “a few days” has turned into a month. I’ve been busy going through this boat with stringer and glass work. Pulled the prop and found out the prop hub bolts are indeed 1/2”.... It seems the motor is dimensionally correct for a 0360.