Chapter 6 Cooling Water System
3. Fresh Water Pump
4LHA Series
Tap
for water temperature switch
Inlet
for water heater
From
heat
exchanger
(fresh water tank)
m
To heat exchanger
(fresh water tank)
Tap
for water temperature
sender
unit
Outlet for water heater
3-2
Specifications
of
fresh
water
pump
Crank
shaft speed (max.)
3600 rpm
Pulley
ratio
(crank shaft/pump shaft)
0134/0120
«134/0120= 1.083
Pump
shaft speed
2970-3030
rpm
Delivery
capacity
150 //min (5284 in.Vmin)
Total head
5m (16.4 ft)
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 water 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
686-1079(70-110) N(kgf)-cni
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 parts, 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.
Cyli.
head
Thermostat
Beanng
unit
V
pulley \
Pump
plate
V
pulley flange
Pump
body
Mechanical
seal
Gasket'
—- To cylinder body
O
ring
v
Pipe
flange
(3) Check the holes in the cooling water 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.
6-8
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