Pressure, and vacuum ? I sure hope not ! The gear lube
monitor bottle has a vented cap...

so if you don't vent the unit with the upper vent plug and
fill from the lower fill plug, you may have some better new method to
recommend to the MerCruiser people... where are you putting your
displaced air as you fill the gearcase?

Heavier gear lube runs down the hose from the gear lube
monitor container, and the lighter air travels up the hose,
into the lube monitor and out the vented cap. But hell,
I dunno - maybe there is some sort of check-valve on
the hose between the gear lube monitor tank and the drive?


Rob


There is no check valve. I'm pretty sure filling the gearcase from the top
would work. Could you give me a rough estimate as to how long it would take
to fill an Alpha gearcase from the top. Seems to me that it would take a
long...long...long...long...long time.
Jim