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Gear box oil leak

Evinrude outboard motor 15HP 1974 Model. Need a manual or diagram of the gearbox and how the gear shift seal is fitted/replaced. Also need a diagram of how the water pump is connected into the power head.

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  • earlitsch Dec 23, 2008

    Thanks for your help. My gear case does not split in half. the gear shift shaft goes through a brass bush with a 'o'ring below it. The brass bush is pressed very tightly into the casing.

  • Anonymous Mar 23, 2014

    can I reach it and is the Rule 500 GPM - 25D the proper replacement pump?

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I cant get the low end to take oil what am i doing wrong?

Posted on Mar 05, 2014

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Hi i have a 15 hp johnson theres water in the oil and my water pump gone as well what would be from and how to fix it thanks again

Posted on Sep 27, 2012

  • Jim Beaty
    Jim Beaty Oct 24, 2013

    No stream of water discharging is usually caused by a worn out impeller. There is a pin , or keyway on the driveshaft. Sometimes the impeller will freeze or stick to the impeller housing and shear off if the motor has been sitting in storage for a long while. Remove your lower unit and driveshaft. The pump sits on top of the gear case with the driveshaft running through it. Drain your contaminated oil and pressurize the lower unit. Soap up the top and bottom end of the gear case and check for bubbles

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Here is a website where a manual for you outboard may be purchased.  Outboard Marine went out of buisness in 2000 and thus no parts of origial manufacture are support is available . Therir are secondary markets .    THe Lower case splits in half and their is a seal around the prop shiftm which is pressed in. The seal between the cases are cut o-rings which are placed and glued into place with gasket seal.
The water pump is located where the case splits a little bit higher. You must open the little port on the side and take out one of the screws to the connecting shift linkage to split the case. After splitting the case the drive shaft and water pickup tube(s) wil come out of the powwer head or the tubs may stick into the power head which is ok. Place the lower skag into a vice and remove the 4 or 5 screws to the water pump housing. Remove and replace impellor and impellor plate if available. If part(pieces) of the rubber impellor is missing flush out the tubes and the power head to remove them.   When reinstalling the lower unit use a flash light to make sure that the tubes return  to the proper place in the power head and the shift lever is resecured. If you need more assistance, just write back. I was an Outboard motor mechanic for five years about the time of your motor.  

Posted on Dec 23, 2008

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