Topic: 1956 Evinrude 15 HP Model 15016 con rod – Antique Outboard Motor Club,Inc

This topic has 10 replies, 5 voices, and was last updated 4 years, 4 months ago by olcah.

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June 20, 2021 at 10:34 am #240725
olcah
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Did the push test for bearing wear with a wood rod on the cylinders. The top cylinder has a small amount of motion. Estimate .003 in. The piston rods on this motor have needle bearings on the crankshaft end and a plain bearing at the piston pin. Is this ok? I plan to use this motor, maybe a lot. If I need to fix, what is the best way? Replace piston/rod combination?
June 20, 2021 at 2:41 pm #240745
fleetwin
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.003″ of slop surely doesn’t seem like much to worry about….Keep in mind that what might seem like slop in the rod much just be a bit of sideways slop in the piston… I would just try to run it, excessive rod slop will be audible at idle speed if it is an issue..
June 20, 2021 at 4:15 pm #240765
olcah
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Fleetwin, Thank you!
June 20, 2021 at 4:20 pm #240766
olcah
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The motor has the notorious 303804 bottom crankshaft seal (see photo). How do I get the seal out to replace it without opening the crankcase? I have seen explanations in past threads but they seemed hard to follow. I am very concerned that the crankshaft seal surfaces could get damaged.
- This reply was modified 4 years, 4 months ago by Mumbles.
June 20, 2021 at 6:23 pm #240777
Mumbles
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There might be a way to R+R that seal but if they haven’t fallen out already, I like to split the cases so I can have a good look inside anyway. It’s also a good time to change the upper seal to while the crank is loose. The rubber is what falls out, leaving the metal outer case behind.
- This reply was modified 4 years, 4 months ago by Mumbles.
- This reply was modified 4 years, 4 months ago by Mumbles.
June 20, 2021 at 7:15 pm #240781
olcah
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Mumbles,
Thank you. I will probably open the crankcase too. I was hoping to avoid that step but it looks like no one has a magic bullet.
🙂
June 20, 2021 at 8:20 pm #240782
frankr
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Actually, it isn’t hard to pry out with a screwdriver.
June 20, 2021 at 9:36 pm #240783
olcah
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Frank,
Thank you. I will look the seal over carefully. Do you have any tips that would help prevent damage to the crankshaft seal area?
June 21, 2021 at 9:01 am #240812
Buccaneer
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If you have a old screw driver you could grind a radius on it to match the seal bore,
and sand any sharp edges off the screw driver. I have an assortment of little
wood blocks handy for using under my pry bars for leverage.
Last year I replaced the crank seals on three Big Twins…. opened up the cases
on all three which made seal replacement “easy”.

Prepare to be boarded!
June 21, 2021 at 10:07 am #240821
olcah
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Thank you Buccaneer.
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