Yanmar 3YM30 Sevice Manual page 33

2) Checking marine gear lube oil level
a) Check the lube oil level of the marine gear with a
dipstick.
Marine gear oil capacity
KM2P-1
b) When the level is low, remove a oil filler cap at
the top of the housing, and fill it with marine gear-
clutch- lube oil to the upper limit on the dipstick.
c) Tighten the oil filler cap securely by hand.
(4) Seawater outlet
Check whether seawater comes out just after the engine has started.
If seawater doesn't come out, shut down the engine immediately.
Check the leakage of seawater in the seawater pass and the damage of the seawater pump impeller.
(5) Check cooling water level
Daily inspection of cooling water should be done only by coolant recovery tank.
1) Checking cooling water volume
Check the cooling water level in the coolant
recovery tank. If the water level is close to the
LOW mark, open the coolant recovery tank cap
and replenish the coolant recovery tank with clean
soft water to the FULL mark.
Standard
The water level of the coolant recovery tank shall
be between the upper and lower limit lines.
2) Replenishing engine with water
If the cooling water leveling the coolant recovery tank is lower than the LOW mark, open the filler
cap and check the cooling water level in the coolant tank. Replenish the engine with the cooling
water, if the level is low.
• Check the cooling water level when the engine is cool.
Checking when the engine is hot is dangerous. And the water volume is expanded due to the
temperature.
• Daily cooling water level check and replenishing shall be done only at the coolant recovery tank.
Usually do not open the filler cap to check or replenish.
Standard
Cooling water volume
Model Engine
3YM30 4.9 (5.2)
3YM20 4.1 (4.3)
Unit: liter (pint)
Full : 0.30 (0.64)
• Never open the filler cap while the engine is still hot. Steam and hot
water will spurt out and seriously burn you. Wait until the engine is
cooled down after the engine stopped, wrap the filler cap with a rag
piece and turn the cap slowly to gently release the pressure inside the
flesh water tank.
• Securely tighten the filler cap after checking the flesh water tank. If the
cap is tightened loosely, steam can spurt out during operation.
Unit : liter (quart)
Coolant recovery tank
0.8 (0.8)
0.8 (0.8)
To fresh water
cooler
Upper limit
Lower limit
Coolant recovery tank
18
2. Inspection and adjustment
Oil filler cap
Dipstick
Cap
FULL
LOW