Re: 54Evinrude Big Twin crankcase

[olcah]

http://s77.photobucket.com/user/cheryls … ml?filters[user]=143951230&filters[recent]=1&sort=1&o=1
http://s77.photobucket.com/user/cheryls … ml?filters[user]=143951230&filters[recent]=1&sort=1&o=0

Please look at the thread "54 Johnson RD15A Top Seal (still() Leaks" from September which has a great explanation of how the top seal is supposed to drain by Frank Robb. Above is what I saw when opened. No smoking gun. I noticed that the top bearing has an o-ring which surprises because the final setup is not supposed to have an o-ring. The seal is supposed to drain thru a very small hole in the old o-ring groove. See photo below. The toothpick is stuck in the hole as I could not get a good photo. Shooting a little WD40 in the hole shows it drains to the reed plate and then thru the plate into the intake. (Frank’s explanation in the old thread is best.)

http://i77.photobucket.com/albums/j66/c … dudclx.jpg
http://i77.photobucket.com/albums/j66/c … yievob.jpg
The Johnson and Evinrude 25HP for 1954 are identical but the Evinrude parts book shows an o-ring around the top bearing while the Johnson book does not. My motor has that ring. Here is the top seal area.

http://i77.photobucket.com/albums/j66/c … gqxtb0.jpg

http://i77.photobucket.com/albums/j66/c … kdvbzd.jpg
http://i77.photobucket.com/albums/j66/c … 8f9ven.jpg

Will go with what I think is the latest configuration and put the motor back with no top o-ring at the bearing. The top seal already has a new carbon and new square ring that I put in last winter. Will check lower seal and replace the o-ring in the carbon also.

Thanks to everyone and for sure open to suggestions.
Charlie