Evinrude 18HP 1960 low power

[necks]

I have a question for “Fleetwin”. Back in the day when I was working on lawn & garden equip, on Lawn Boy mowers, when you had to replace the reeds, their were 2 sides on reeds, one side was smooth, the other side was rough, which you felt with your finger, easy to mix up, they would fit either way. They were made by OMC. Just wondering if all OMC outboards were the same way (Rough side-Smooth side), also can’t these carbs be checked with a vacuum type tool after a fresh rebuild to see if you have any leaks, before it’s installed on engine. I seem to remember that was a step that was done with carbs in repairing Toro’s and weedwhips.  Gene.

[fleetwin]

Hmmm, it’s been many years since my Lawnboy days at “the power shoppe”.  I don’t remember having rough/smooth side reeds, but can honestly say I probably never disassembled a reed block on a lawnboy.  Those air filters were so flimsy, crap did used to get in there and hold a reed valve open.  I usually just slipped the crap out of the reeds without disassembling.  So, I guess what I’m saying is that the reeds may have had a rough/smooth side, I just never knew about it.

But, I have never heard of rough/smooth sides on OMC outboard reeds, although there were some specific orientation procedures on some engines.

And yes, using the vacuum gage would be very helpful.  But, the problem is that OMC never published any procedures or specs for vacuum gage usage..  So, using a vacuum gage could cause confusion…  Most of the outboards don’t have a proper vacuum port anyway.

[labrador-guy]

crosbyman wrote:

so  for referrence  what size  tap was used on the seat

I taped the seat and I used is a 5/16X24.  I have no way to tap the housing.

dale

[salnaes]

Hello everyone
I am impressed with everyone who is contributing to my little problem with an Evinrude 18HP not running properly. Now I’m going to tell a little story. I have restored a 10ft plastic boat from 1965 built in Norway. These small boats are from the brand ‘With’ and were incredibly popular in the 60s and 70s here in Norway. As a little boy I had such a boat with 4HP Tomos. Little boys make up tricks when dad is at work. I disconnected a Carniti 22HP from my dad’s boat and hooked it to my 10ft boat. I am 71 years old now but still have my 10ft With. I have completely restored the boat and wanted to go fast again. So I bought an 18HP Evinrude Fastwin but it was really bad so I had to completely strip it down and overhaul everything. It was finished last year at this time and started fine. I ran it in a test tank and then put it away for the winter. In the spring of 2023, I mounted it on the boat and was going to drive it for the first time. What I didn’t know was that the petrol we can buy now contains ethanol. Ethanol eats rubber. The leakage from the fuel hoses, which were brand new, is probably due to ethanol. In addition, today’s petrol is lead-free. So environmental concerns have consequences for us who want to take care of the old. Now I probably have to change the fuel hoses and also the gaskets in the carburetor again. I have also seen that the petrol is leaking from the gasket on the petrol tank. I changed this gasket before I started driving with the newly overhauled outboard motor. I hope that the only thing left now is to replace everything made of rubber in the entire fuel system. So all hoses must be replaced with new ones, all rubber gaskets in the carburetor must be replaced again. The same applies to the fuel tank. Hopefully the outboard motor will be as good as new when these works are completed. Many thanks to everyone who has helped me here at aomci.org throughout the year. You guys are amazing.
Sal

[fleetwin]

The latest OMC/BRP carb overhaul/rebuild kit will have components that are resistant to ethanol and all the other crap that is in fuel today.  Do replace the fuel lines though..

[salnaes]

Thank’s fleetwin. I bought Carb Repair Kit AY P/N 439071 Genuine Parts Evinrude Johnson BRP from a local Evinrude dealer here in Norway. I don’t know when those parts were manufactured. I hope they are the latest parts from BRP.

The kit contains some items ment for different carbs . Among those items are Carburetor to manifold gasket (different size gaskets) and Core plug (different sizes).  But there’s a thick rubber ring that I cannot find any use for. It’s not the 344037 – Gasket which sits on the Nozzle. See attached image where red arrow points at the gasket. Does this gasket have to be attached to the carb I have on my Evinrude 18HP Fastwin 1960 mod 15032?

 

[seakaye12]

I’ve never been able to figure out what engine(s) that thick o-ring is used for….but it’s not the 18HP Fastwin.

[crosbyman]

if you are talking fat  donut  it goes at the bottom of several  carb  model  high speed post

Joining AOMCI has priviledges 🙂

[Steve D]

“But there’s a thick rubber ring that I cannot find any use for. It’s not the 344037 – Gasket which sits on the Nozzle. See attached image where red arrow points at the gasket. Does this gasket have to be attached to the carb I have on my Evinrude 18HP Fastwin 1960 mod 15032?”

You don’t have to worry about that one. It’s for some earlier 10 horse models and maybe others. But not for your 18.

[salnaes]

Thank you all for helping me out with my worries concerning the fat O-ring and all other issues you have solved for me.

My 18HP Fastwin from 1960 is working very nicely now, and my 10 feet boat is dancing across the water! It’s speed must be close to 30 knots. At least it feels like it’s running that fast.

My only concern now is that fuel is pressed up into the ignition system so it’s a little difficult to start the engine. After all I had som doubts about my crankshaft upper end which had a blueish color due to overheating of the outboard in the Powerhead. This was caused by a faulty Upper Water Tube Grommet that was blocking water from the water pump. So the Powerhead did not get cooled at all, and the extremely hot exhaust burned a hole in the engine block near the flange close to the exhaust tube. All this was messed up by the previous owner, and I did not discover it by the time of purchase. But had the hole welded, and the complete outboard overhauled with new pistons, rings and a lot of other new parts, so it’s ok now. I took a chance on re-using the Crankshaft, but I sure should have renewed it. But I did not find any new crankshaft online, and in my country (Norway) it’s very difficult to find parts what so ever for this oldtimer. If I had found a proper crankshaft I also would have to purchase new crankshaft bearings, rod bearings etc.

[Author]

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