Yanmar 4JH2E Service Manual page 193

Chapttr 5 lubrication Systtm
5. lubt Oil Coo/tr
4JH2-Series
Lube Oil Cooler
4JH2-TE
4JH2-HTE
[Applicable Engine Model 4JH2-DTEJ
4JH2-UTE
5-1 Lube oil cooler construction
The lube oil coole·r is comprised of 36 cooling pipes
and 9 internal baffle plates.
The lube oil flows through this passageway and is
cooled by the cooling water (sea water) flowing
through the inner pipe.
Sea water outlet
...... Lubricating oil outlet
Sea water inlet
Oil outlet
.
'
:ea water inte,f\
~ 'Jl·~
~ '
\.'}
...
_ \
'~bil
inlet
)ea water outlet/
~-
5-10
Lubricating oil outlet
Cooling area
Cooling water
discharge volume
Lubricating oil
discharge volume
Lubricating oil temperature
at 40°C room terrp!rature
::~
:CJ
·~.i
Lubricating oil inlet
0.165m
1
(255.75 in.
1
)
35002/hr (213570 in
1
/h)
2160 I/hr (131603 in.'/h)
5·2 Inspecting the lube oil cooler
(1)
Clean the Inside of the sea water pipes with a wire
brush to prevent the build-up 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 sea water
and lube oil lines to check for any leakage. Repair or
replace the cooler if there are any leaks.
Test pressure
Lubricating oil circuit
1 Skg/cm
1
1213.30 lb/in.
1
)
Sea
water circuit
4 kg/cm' (56.89 lb/in.')
Printed in Japan