Gear ol vent hole blocked

[Mikelisi]

I was pumping gear oil into my 3.5hp Nissan and the oil started to come out the flange above the lower gear housing.
Does this mean I have an oil seal leak or is the pressure of the oil pump too much for the seals to handle? I was using a hand oil pump.

Also how do I unclog the upper oil vent?

Mike

 

[Grub54891]

Re: Gear ol vent hole blocked

There should be 2 screws in the gearbox. One at the bottom for draining and filling. The upper screw is the one you take out when filling,pump till oil comes out of the top hole,put the screw back in with new gasket,the remove the bump and quicly install the bottom one with a new gasket.hopefully ya didn't blow the top seal out. I'd pressure check it before re-doing.

 

[pvanv]

Re: Gear ol vent hole blocked

You didn't mention model/serial. We should have that to help you much. That aside, see Tohatsu Outboards: Gear Oil/Lube Change for Outboard Motor for a complete description of how to do your LU lube change.