Lube Oil Cooler; Lube Oil Cooler Construction; Inspecting The Lube Oil Cooler - Yanmar 3JH4E Service Manual

8. Lubrication system

8.4 Lube oil cooler

8.4.1 Lube oil cooler construction

The lube oil cooler is located between the lube oil
filter and the filter bracket, which is mounted on the
cylinder block.
The lube oil is cooled by fresh water.

8.4.2 Inspecting the lube oil cooler

(1) Clean the coolant 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 fresh water path and lube oil path
lines to check for any leakage. Repair or
replace the cooler if there are any leaks.
Lube oil circuit
Fresh water path
Test pressure
2
0.98 MPa (9.6 kgf/cm )
2
0.20 MPa (2.0 kgf/cm )
Lube oil cooler
4JH4-TE
Cylinder block
Fresh water
Joint
Filter bracket
Clamp
Drain cock
258
010545-00E
Gasket
To fresh
Bolt
water pump
Clamp
Lube oil cooler
Lube oil cooler nut
Lube oil filter
010546-00E