Inspection Every 50 Hours - Yanmar 6LYA-STP Operation Manual

（2）Replacing Marine gear Lube Oil and
Cleaning the Filter (Ist time)
During initial operation of the engine, the lube oil
is contaminated quickly due to initial wear. The
lube oil must be replaced early. Clean the clutch
Iube oil filter, too, at this time.
①Remove the filler port cover, insert the drain
oil pump hose to the bottom of the marine
gear and pump out the lube oil from inside the
marine gear.
②Remove the filter in the side cover, extract the
filter and clean the filter with kerosene.
③When installing the filter, attach the side cover
by pressing it by coil spring.
Do not forget to place the O-ring inside the
side cover.
④Supply new lube oil to the specified level.
⑤Trially operate the engine and check that no oil leaks.

4.3.2 Inspection Every 50 Hours

（1）Draining of the Fuel Tank (Hull) (local supply)
Open the drain cock of the fuel tank to extract drain (water, dust, etc.) from the tank' s bottom.
Receive the drain in a container. Drain until fuel with no water and dust flows out. Then close
the drain cock.
（2）Draining of the Oil / Water Separator
(optional)
①Close the fuel cock.
②Remove the drain plug at the bottom of the
oil/water separator and drain water and dust
from inside.
③After draining of the oil / water separator, be
sure to vent air from the fuel system.
(See 3. 3. 2 (3))
[Fig.20]
Lube oil filter (inside)
(KMH6A, KMH6A1)
(
Marine gear (YAnmar
model: KMH6A)
(See 3. 2. 3.)
_ _
37
Lube oil cooler
)
Drain oil pump (Optional)
Drain plug