Lube Oil Filter; Lube Oil Filter Construction; Lube Oil Filter Replacement; Lube Oil Cooler - Yanmar 3JH4E Service Manual

8. LUBRICATION SYSTEM

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
2
reaches 0.8-1.2kg/cm
Type
Filtration area
Discharge volume
Pressure loss
By-pass valve
opening pressure

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.
Lubricating oil circuit
Seawater path
.
Full flow, paper element
2
0.069 m
20 l/min
0.01-0.03 MPa
(0.1-0.3 kgf/cm
0.08-0.12 MPa
(0.8-1.2 kgf/cm
Test pressure
0.15 MPa (1.5 kgf/cm
0.4 MPa (4 kgf/cm
Cylinder block
Joint
Clamp
Filter bracket
Drain cock
Clamp
Lube oil cooler nut
2
)
Lube oil filter
(Lube oil filter and cooler)
2
)
2
)
2
)
144
Gasket
Bolt
Clamp
Lube oil cooler
To fresh
water pump