The lower unit converts the power of your outboard’s engine to
rotation of the prop shaft, which moves the propeller, which moves your
boat. Without it, you go nowhere. Its internal mechanical workings put
tremendous pressure on the lubricant inside.This hardworking device
just needs some simple, regular maintenance to help it stay that way.
LOWER UNIT
Keep the gears in motion
Scan here to see a
video about lower unit care.*
Lubricate it right.
The gears inside your lower unit are constantly
turning, and the only protection they have is
the lower unit lubricant you use. Its job is to
form a micro-thin film between the metal
component parts to keep them from actually
touching. Under the large loads these gears
exert, proper lubrication requires extreme
resistance to pressure, foaming and molecular shear. And, since the lower
unit operates underwater, its lubricant also has to be capable of maintaining
necessary lubricity even when a significant amount of water is present, should
some leak inside. Ordinary gear lubricant can’t do all of this; so always avoid
automotive or tractor gear oils. Use a quality, marine-based formula, like
Yamalube
®
Marine Gearcase Lube. It can perform all of these required
protection and lubrication duties, even with a full 10% of water present. There’s
even an HD formula, to meet the
special needs of Yamaha’s
top-of-the-line V MAX SHO
®
,
4.2L V6 Offshore and
5.3L F350 V8 outboard
lower units.
Vent
Screw
Drain
Screw
24
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