Yanmar 3JH3E - 3-2 Specifications of fresh water pump; 3-3 Fresh water pump disassembly; 3-4 Fresh water pump inspection

Chapter 6 Cooling Water
System
_3_.
F_re_s_h_tt_ra_t_er_P_u_m_p
_________________________
3,4]H3(B)(CJE
~
To
heat
exchanger
Inlet
for
water
heater
(fresh
water
tank)
For
turbine
cooling
water
joint
. .
and
water
temperature
switch
Bearing
unit
For
sender
unit
V-pulley
\
From
heat
-
exchanger
(fresh
water
tank}
3-2
Specifications of fresh water pump
Pulley ratio
(crank shaft'pump shaft)
¢,134/¢>120
Pump shaft speed(Max) 4020
rpm
Delivery capacity
70£/min
Total head
4m
3-3 Fresh water pump disassembly
(1)
Do
not disassemble
the
fresh water pump.
It
is
difficult
to
disassemble and, once disassembled, even more dif-
ficult
to
reassemble.
Replace
the
pump
as
an
assembly
in
the event of trouble.
(2)
When removing the fresh waler pipe
as
an
assembly
from the cylinder and cylinder head, replace the
cylinder intake pipe O-ring.
(3)
When
the
fresh water pump body and cylinder intake
flange and/or fresh water pump and pump plate are
disassembled,
retighten
to
the
specified
torque.
Tightening
torque
for
pump
setting
bolts
70~11
O
kg
·cm
3-4 Fresh water pump inspection
(1)
Bearing unit inspection
Rotate the impeller smoothly.
If
the rotation
is
not
smooth
or
abnormal noise
is
heard due to excessive
bearing play or contact with other
r::,arts,
replace the
pump as
an
assembly.
(2)
Impeller inspection
Check the impeller blade, and replace if damaged or
corroded.
or
if the impeller blade is worn due
to
contact
with pump
body_
V-pulley
flange
6-6
-
To
cylinder
body
,-....__--U-....J
Gaskel
Pipe
flange
(3)
Check the holes
in
the cooling waler and bypass lines,
clean out any dirt
or
other foreign matter and repair as
necessary.
(4)
Replace the pump
as
an assembly if there is excessive
water leakage due to mechanical seal or impeller seal
wear or damage.
(5)
Inspect the fresh water pump body and flange, clean
off scale and rust, and replace if corroded.
(6)
Measure the clearance between the impeller and the
pump body. and the impeller and the plate.
Measure the clearance between the Impeller and the
pump body by pushing the impeller all the way towards
the body, and inserting a thickness gauge diagonally
between the impeller and the body.
Measure the clearance between the impeller and the
plate (pump body bracket)
by
placing a straight-edge
against the end of the pump body and inserting a
thickness gauge between the impeller and the straight-
edge.
Printed in Japan
HINSHI-H8009