lower unit filler hole

[mercfreak]

i have a 1962 850 kiekhaefer. i can't disdinquish which upper plug i remove to fill lower unit. on one side of unit, one plug is marked vent, and on the same side another plug is marked flush, on the other side of unit is one plug but not marked. if anyone can help i would apprec. it. thanks

 

[oldman570]

Re: lower unit filler hole

The gear case vent and drain plugs for LU grease are on the same side of the motor and look the same size. The plugs marked as vent and flush are for other uses. JMO
Oldman570

 

[racerone]

Re: lower unit filler hole

Here is the way it wurks.-------Oil is squeezed in the drain hole till it comes out the vent hole.----------Install vent plug then remove filler device and install drain plug.----------Motor in normal running position.---------This is the accepted way of filling lower units !!--------Please follow this procedure.----------The flush plug has to do with cooling water.

 

[hotrod53]

Re: lower unit filler hole

I suggest replacing your gaskets on the drain and the vent when you do this just for insurance, especially for the $5 in parts.