Opel Frontera UBS. Service manual — part 408
SECTION 6B
ENGINE COOLING
CONTENTS
PAGE
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6B- 1
On-Vehicle Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
6B- 5
Water Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6B- 5
Thermostat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
6B- 7
Radiator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6B- 9
Drive Belt Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . .
6B-15
GENERAL DESCRIPTION
6B – 2 ENGINE COOLING
ENGINE COOLING 6B – 3
The cooling system is a pressurized coolant forced
circulation type which consists of water pump, thermostat
cooling fan, radiator and other components. The
circulating coolant cools the lubricating oil in the oil filter
and turbocharger.
WATER PUMP
The coolant pump is a centrifugal impeller type and is
driven by V type drive belt.
THERMOSTAT
The thermostat is a wax pellet type with a jiggle valve and
is installed in the thermostat housing.
RADIATOR
The radiator is a tube type with corrugated fins. In order
to raise the boiling point of coolant, the radiator is fitted
with a cap in which the valve is operated under the
pressure.
6B – 4 ENGINE COOLING
ANTI-FREEZE SOLUTION
•
Relation between Mixing ratio and Freezing point
Freezing temperature of the engine coolant varies
with the ratio of anti-freeze solution in water.
Proper mixing ratio can be determined by refering to
the chart. Supplemental inhibitors or additives
claiming to increase cooling capability that have not
been specifically approved by Isuzu are not
recommended for addition to the cooling system.
•
Calculation of mixing ratio
Mixing ratio
Note: Anti-freeze solution + Water = 8.6 lit
Total cooling system capacity.
=
Anti-freeze solution (Lit/qt.)
Anti-freeze solution (Lit/qt.) + Water (Lit/qt.)
In case of 6.8 lit total cooling system capacity
Mixing
ratio (%)
Anti-freeze
solution:
lit. (imp. qt./U.S. qt)
Water:
lit. (imp.qt/U.S. qt)
0
5
10
15
20
25
30
35
40
45
50
0
0.3
0.7
1.0
1.4
1.7
2.0
2.4
2.7
3.1
3.4
0
(0.26/0.32)
(0.62/0.74)
(0.88/0.93)
(1.23/1.48 )
(1.50/1.80)
(1.76/1.86)
(2.11/2.23)
(2.38/2.85)
(2.72/2.87)
(2.99/3.60)
6.8
6.5
6.0
5.8
5.4
5.1
4.8
4.4
4.1
3.7
3.4
(5.98/7.19)
(5.71/6.87)
(5.28/6.34)
( 5.1/6.13)
( 4.75/5.7)
(4.49/5.39)
(4.22/5.04)
(3.87/4.65)
( 3.6/4.33)
(3.26/3.91)
(2.99/3.59)
•
Mixing ratio
Check the specific gravity of engine coolant in the
cooling system in temperature ranges from 0° C to
50° C using a suction type hydrometer, then
determine the density of the coolant by refering to the
table at left.
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