18hp 1962 Evinrude Fastwin question

[adam_mac84]

I’ll try to shoot some pics this weekend with a real camera and flash. Interesting watching people who know what they are talking about weigh in on this. Who knew it was even a puzzle .

I was going to order an impeller (did open the pump just to confirm things were in one piece down here and was intact).


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[Shaugh]

This photo of the top of the head clinches it for me... paint doesn't look that green, and the OEM plug is correct.... Hard to imagine a rebuilt head that got an OEM plug of the correct model put in ?

The worry about the lower unit is that it might be a newer model. The only way to really tell is pull it apart and find some part numbers on the pump housing etc. The paint color variations could simply be that somebody touched up the motor with a paint that didn't match ...

 

[adam_mac84]

Here’s what I could gather. To my eye the powerhead and the inside of the motor housing look the same color. But under fill flash. Not so much. I looked for other I.D. numbers on the lower and did not find anything.

I am also trying to figure out how to get this gear off so I can replace the bushing under to try to fix some slop. I have it (throttle linkage) all disassembled but it won’t move up enough to come out. Do I need to disassemble further. (Motor mount is right there)

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[Shaugh]

Part #29 just sits in that bushing:
https://www.marineengine.com/parts/johnson-evinrude-parts.php?year=1961&hp=18&model=15035&manufacturer=Evinrude&section=Exhaust+Tube+And+Swivel+Bracket

But you need to remove part # 31 shown here to be able to lift it up. A common cause for slop in that system is a broken/cracked part #30... take it all apart and inspect it.
https://www.marineengine.com/parts/johnson-evinrude-parts.php?year=1961&hp=18&model=15035&manufacturer=Evinrude&section=Powerhead+And+Fuel+Pump



Remove the lower unit and look at the impeller and housing before you buy replacements... often they were updated with later model parts.

 

[Pappy]

Shaugh is correct. Never assume you just need an impeller. Look at the parts first. If the housing is grooved then the new impeller will suffer leakage all around and lose efficiency. Buy a housing for it if this is the case. Plus, who knows how long housings will be available so get the parts while you can.

 

[satx78247]

pappy,

VERY TRUE.

yours, tex

 

[adam_mac84]

Part #29 just sits in that bushing:
https://www.marineengine.com/parts/johnson-evinrude-parts.php?year=1961&hp=18&model=15035&manufacturer=Evinrude&section=Exhaust+Tube+And+Swivel+Bracket

But you need to remove part # 31 shown here to be able to lift it up. A common cause for slop in that system is a broken/cracked part #30... take it all apart and inspect it.
https://www.marineengine.com/parts/johnson-evinrude-parts.php?year=1961&hp=18&model=15035&manufacturer=Evinrude&section=Powerhead+And+Fuel+Pump



Remove the lower unit and look at the impeller and housing before you buy replacements... often they were updated with later model parts.

I’ll have to have another go at it. I had #31 out and the gear would come all but maybe 1cm out from the bushing and it would get stuck hitting the motor housing. I’ll grab a pic next time. It is probably some stupid thing that I am not tilting right. I had everything disassembled from above and leading into that throttle gear. [emoji848]

I will also likely check back in before ordering any parts if I cannot find part numbers othe impeller as it seems this may have been a mechanics special so to speak. I already found one bolt on the lower that was rethreaded with a totally different thread pitch (my guess is a drilled out bolt)



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[Pappy]

When I get into a vintage, antique, project engine or an older engine brought in by a customer what usually happens during the repair phase is what I call an "SRS".
SRS simply stands for Sin Removal Service.
All who have touched the engine before you will leave their mark in one form or fashion. Sometimes it is a downright sin to see what these engines have gone through from folks working on them.

 

[satx78247]

pappy,

100% TRUE.

yours, tex

 

[GarageBeers]

hey Adam_Mac84- you still monitoring this?

 

[airshot]

Fond memories here.....my dad bought a new 1964 Evinrude 18 hp for our 14' tinnie. Three years later I took over the boat and motor from him. If my memory serves me right, these were the first to use the "new" 50 to 1 oil ratio....we didn't... To scared it would damage the engine. We started at 32 for breakin period and always added a little more oil than the 50 ratio. Was a great motor, we could actually ski behind it...

 

[Pappy]

Yep would like to know as well. Shaugh may be right on the color but to me that green color is pretty vivid unless the photo accentuates it a lot.
"If" the color is correct that would mean that the powerhead is 1955 or earlier. In 1955 there was never an 18hp engine on the Johnson side.
The one photo that shows the thermostat looks like the color is a faded greenish which goes in favor of what Shaugh is thinking. Johnson never put a thermostat on that powerhead color. Others,closer up show more of a vivid green.
Was it repainted? Who knows. ......... Things that make you go Hmmmmmmm!