Topic: crankshaft seals – Antique Outboard Motor Club,Inc

This topic has 11 replies, 9 voices, and was last updated 8 years ago by olcah.

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September 15, 2017 at 12:37 pm #8232
edgartc
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What is an indicator that the crankshaft seals are bad. Abnormal carburetor settings, poor low speed, poor hi speed, will not start, all of the above?
September 15, 2017 at 12:46 pm #64917
RICHARD A. WHITE
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Lifetime Member
If the upper is bad, it generally will sling oil all over the points…

http://www.richardsoutboardtools.com
classicomctools@gmail.com
September 15, 2017 at 1:36 pm #64921
frankr
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US MEMBER PAY BY CHECK
Depends on what motor you are talking about. Some, all of the above, some you will not see any symptoms till the whole powerhead is trashed from water intrusion into the crankcase.
September 15, 2017 at 2:24 pm #64925
PugetSoundBoater
Participant
Mumbles posted a You Tube video of what the bad top crankshaft seal looks like with outboard oil applied.

"Some people want to know how a watch works, others just want to know what time it is"
Robbie Robertson
September 15, 2017 at 3:41 pm #64929
1957evinrude
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US Member
I was told by members here if u own a 1956 15 hp evinrude or Johnson and 1956 12 hp gale its best to replace the bottom crank seals as they are prone to failure
September 15, 2017 at 4:17 pm #64932
Mumbles
Participant
If the top seal is gone, the bottom one will probably need replacing to at the same time, especially if the motor has lip style seals instead of O rings.

https://www.youtube.com/watch?v=cXt6fV6Z5rc

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September 15, 2017 at 11:42 pm #64954
edgartc
Participant
Thanks good info
September 16, 2017 at 1:56 am #64963
1957evinrude
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US Member
I replaced the bottom seals on my 56 15 and 12 hp engines. Its not difficult at all.
September 17, 2017 at 10:03 am #65016
olcah
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US Member
How did you get the old ones out without damaging the crank surface?
September 17, 2017 at 2:17 pm #65026
Tubs
Participant
quote OLCAH:

How did you get the old ones out without damaging the crank surface?

The screw method works well but there are tools.

https://www.youtube.com/watch?v=l7ryeygpM2M
https://www.youtube.com/watch?v=tvoyD9V8_8M
https://www.youtube.com/watch?v=iQwulUnPxew

A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.
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