Yanmar 3JH4BE - Lube Oil Filter; Lube Oil Filter Construction; Lube Oil Filter Replacement; Lube Oil Cooler

8. LUBRICATION SYSTEM
144
8.3 Lube Oil Filter
8.3.1 Lube oil filter construction
The lube oil filter is a full-flow paper element type.
mounted to the side of the cylinder body with the filter
bracket. The cartridge type filter is easy to remove.
To prevent seizure in the event of the filter clogging up,
a bypass circuit is provided in the oil filter. The bypass
valve in the filter element opens when the difference in
the pressure in front and behind the paper element
reaches 0.8-1.2kg/cm
2
.
8.3.2 Lube oil filter replacement
Refer to 2.2.2(2).
8.4 Lube oil Cooler
8.4.1 Lube oil cooler construction
The lube oil cooler is located between lube oil filter and filter bracket as shown in the above figure.
The lube oil is cooled by fresh water.
8.4.2 Inspecting the lube oil cooler
(1) Clean the cooling water path (fresh water) of the lube oil cooler to prevent the buildup of
scale
(2) If the rubber hose connection or welds are corroded, repair or replace the cooler
(3) Apply the following water pressures to the seawater path and lube oil lines to check for
any leakage. Repair or replace the cooler if there are any leaks.
Type Full flow, paper element
Filtration area
0.069 m
2
Discharge volume 20 l/min
Pressure loss 0.01-0.03 MPa
(0.1-0.3 kgf/cm
2
)
By-pass valve
opening pressure
0.08-0.12 MPa
(0.8-1.2 kgf/cm
2
)
Test pressure
Lubricating oil circuit
0.15 MPa (1.5 kgf/cm
2
)
Seawater path
0.4 MPa (4 kgf/cm
2
)
(Lube oil filter and cooler)
Cylinder block
Fresh water
To fresh
water pump
Clamp
Lube oil cooler
Lube oil cooler nut
Lube oil filter
Joint
Clamp
Filter bracket
Gasket
Drain cock
Bolt
Clamp