force(us marine outboard) help

[joelot]

hello,i have a 1987 50hp us marine also known as force outboard.after changing the lower unit gear oil and then running the boat,i noticed that the oil is milky in color,i opened the plug to change the oil and water come out first.now that tell me that water is getting into the lower unit gear,and i need to find out. is it from a seal or gasket? and if so witch one?... thank for helping

 

[roscoe]

Re: force(us marine outboard) help

You could pressure (5 psi) test the lower unit in a tub of water and look for the leak.

But if I was going to tear into the gearcase to replace a seal, I would replace them all and know I had a good water tight unit when I got it back together.

Good luck, and welcome to iboats.

 

[joelot]

Re: force(us marine outboard) help

thanks for the information,do you know how many seal/gasket i need to replace,and do iboats store has them?

 

[JB]

Re: force(us marine outboard) help

Did you put new gaskets under the plugs when you changed the oil? They are crushable, use-once gaskets and must be replaced every time.

Failure to use fresh gaskets is probably the number one cause of water in the gearcase.

 

[joelot]

Re: force(us marine outboard) help

thanks for answering
i think i need a gasket as you stated
also i noticed that there is a hex socket cap screw missing on the bearing cage.do iboat has those screw?








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[roscoe]

Re: force(us marine outboard) help

you will need to go to a Mercury dealer or a hardware store to get that screw.

 

[joelot]

Re: force(us marine outboard) help

thanks for all the help
do you think i can get a bering cage,without buying the whole lower unit?
if you know of a place please let me know.i may need one.

thanks

 

[roscoe]

Re: force(us marine outboard) help

The propeller shaft bearing cage is still available from Mercury.
Part number 31-817731A5.

Includes cage, 2 seals, and bearing.


The bolts are part number 10-F1263 HEX SOCKET HD CAP SCREW, S.S., 5/16 - 18 X 9/16
Need to order 2 bolts.