Topic: 1954 Evinrude Super Fastwin – Antique Outboard Motor Club,Inc

This topic has 37 replies, 10 voices, and was last updated 8 years, 10 months ago by fisherman6.

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May 28, 2016 at 10:16 pm #4377
fisherman6
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So, I have been working on this project off and on since January. I’m now determined to get it wrapped up before get into another project motor. This is my first one of these ’50s 15hp’s. I have been trying to get this motor to run correctly and it has been giving me some trouble in the tuning department. I currently have the powerhead back off of it making sure everything that is supposed to be there in fact is there.

Am I correct that there is no lower crankshaft seal in this engine? I see nothing on the drive shaft that looks like I am missing anything like a carbon seal and O-ring (like on a 5.5 or 7.5). There is certainly no place for a seal to go on the bottom of the crankcase. The lower crank bearing (bushing) is all that is visible. I just want to make sure I’m on the right track before I put this thing going all back together and try to run it on my freshly rebuilt pressure tank. Here is a pic of the bottom of the powerhead.

OldJohnnyRude on YouTube
May 28, 2016 at 10:23 pm #37273
wedgie
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Hang on while I scan the crankshaft page. 😉
May 28, 2016 at 10:29 pm #37274
wedgie
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May 28, 2016 at 10:51 pm #37275
beerman57
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There has to be a carbon seal, or some type of seal on the bottom of the crank, doesn’t there?
May 28, 2016 at 11:17 pm #37276
Anonymous
ISTR a less than wonderful crank sealing system on the 19.9ci lineage, which includes the 1949 Elto "speedster" 12hp, the 1950-53 14hp Fastwin, 1954-56 15hp Super Fastwin, the early 1960’s Gale 15hp, and the mid 1960’s Worktwin/workhorse 15hp…..
May 28, 2016 at 11:35 pm #37277
frankr
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No bottom seal on a ’54 Fastwin. The bronze bushing bearing is all it needs to keep the crankcase pressure in, and it is not exposed to exhaust & water like the ’55-up.
May 29, 2016 at 1:12 am #37281
fisherman6
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US Member
Thanks guys,

I l see where I was missing anything. That confirms my thought that the bronze lower crank bushing was all the seal there is for the lower end of the crankshaft. I put it back together and tank tested it and I was able to get it close. When I took it to the lake for a run it overheated 😡 even though it was pumping water like crazy. The upper carbon seal doesn’t appear to be leaking. No oil on the mag plate and no apparent sound of a leak. Something is certainly amiss though. I need to figure out what my next move is now.

I was running it on 16:1 mix, freshly rebuilt pressure tank and new o rings in the fitting. It holds pressure for days and doesn’t leak. New fuel lines, carb cleaning and new carb gaskets, spark plugs, plug wires, points, condensers, water pump impeller, and fresh oil in the gearcase. Not sure yet if it hurt anything, but I’m at least going to pull the head and have a look at the bores, cooling passages, etc. I need to get a new head gasket on the way.

OldJohnnyRude on YouTube
May 29, 2016 at 3:20 am #37288
jeff-register
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US Member - 2 Years
Sounds like you may be leaking from the exhaust cooling cavity outside your exhaust ports or maybe the head cooling cover passage ways clogged up. Are you sure your water pipe is connected to the bottom of the powerhead? Those are a few places I would look for clogging or not connected when the powerhead was mounted again. I have the same motor & the pump outputs plenty of water for cooling at all times.
Just a few suggestions to check out.
Good Luck & if you stopped it fast it should not have damage hopefully,
Jeff
May 30, 2016 at 12:03 am #37330
fisherman6
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US Member
Thanks Jeff. I will check all of that stuff out when I pull it apart again. I’ll check the compression numbers again now that the motor has sat for a day. We’ll see what the results are. I’ll be pulling the powerhead again to check all the connections and passages. I’ll report back once I get back to it.
Thanks Again,
-Ben

OldJohnnyRude on YouTube
June 1, 2016 at 1:03 am #37480
fisherman6
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US Member
I checked the compression numbers on the ’54 Super Fastwin. I got about 90 on top and about 92 on bottom so that doesn’t seem too bad. Not much if any different than before the overheat. I put it in the tank and hooked up the fuel and gave it a tug.

It fired up on the second pull from cold. Then I saw water leaking… out of lots of places. Powerhead base gasket, exhaust cover gasket, and the head gasket. Looks like all new gaskets and probably resurfacing the head at least. I’ll check all water passages for blockage when it’s apart again. Hopefully that’s all it takes to get it back up and going again. I’ll get a better look at the cylinders while the head is off.

I’m wondering if the water intake got cowered in weeds. It was my first time on the lake I was on and it is very weedy. I may have picked up enough to restrict flow when leaving the dock and never got rid of them. 😕 It sure seems to be pumping plenty of water and now it is coming out everywhere.

-Ben

OldJohnnyRude on YouTube
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