1996 7.4 bravo II raw water pump. Need help please.

M

muskie hunter

Petty Officer 2nd Class
Joined
Jul 29, 2007
Messages
158
I have a 1996 7.4 Bravo 2. This is a carburated motor and the raw water pump drives the fuel pump also. Anyway I rebuilt the complete pump (impeller,seals,bearings and shaft. The pump cools the motor just fine, the problem is that water is getting past the grease seal and mixing with the gear oil that runs the fuel pump. It then pushes past the outer grease seal and sprays water on the drive pulley. It seems as though water has had to have mixed with the gear oil in the pump(presumably, I havent had a chance to look yet). I dont think that the 3 press in seals are to keep water out of the part the drives the fuel pump,but are present to keep the gear oil from leaking out. (more like a grease seal) Does anyone have a good picture of the pump brakedown. Can anyone offer some advice as to how to keep the lakewater from mixing with the gear oil in the resivior. Am I missing an "O" ring seal or something?
I have a CLYMER manual but the picture brakedown of the pump is lousy.

Thanks Steve.
 
M

muskie hunter

Petty Officer 2nd Class
Joined
Jul 29, 2007
Messages
158
Re: 1996 7.4 bravo II raw water pump. Need help please.

Anyone have any suggestions?
 
M

muskie hunter

Petty Officer 2nd Class
Joined
Jul 29, 2007
Messages
158
Re: 1996 7.4 bravo II raw water pump. Need help please.

Don S said:
See if this helps.
http://www.boatfix.com/merc/Servmanl/16/16A6R2.PDF

Here is the rest of the manual, just scroll to the outline and click on the section letter you want to view or download to your computer.
http://www.boatfix.com/merc/Servmanl/16/16cov2_1.pdf
Click to expand...

Don,
Thanks so much! After viewing the manual, it looks like I forgot to put in the quad ring "O"ring. This must be the ring that keeps the waterpump impeller from pressurizing the gear oil resivior with lake water. What do you think?

Thanks Steve.
 
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