Isuzu NHR 4J Series, Workshop Manual

Page: 248 / 406

ENGINE COOLING 6B - 5
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 referring 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
Anti-freeze solution (Lit/qt.)
=
Anti-freeze solution (Lit/qt.) + Water (Lit/qt.)
Note:
Anti-freeze so Water = 10 lit
Total cooling system capacity.
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
0.5 (0.44/0.53)
1.0 (0.88/1.06)
1.5 (1.32/1.59)
2.0 (1.76/2.11)
2.5 (2.20/2.64)
3.0 (2.64/3.17)
3.5 (3.08/3.70)
4.0 (3.52/4.23)
4.5 (3.96/4.76)
5.0 (4.40/5.28)
10 (8.80/10.57)
9.5 (8.36/10.04)
9.0 (7.92/9.51)
8.5 (7.48/8.98)
8.0 (7.04/8.45)
7.5 (6.60/7.93)
7.0 (6.16/7.40)
6.5 (5.72/6.87)
6.0 (5.28/6.34)
5.5 (4.84/5.81)
5.0 (4.40/5.28)
• Mixing ratio
Check the specific gravity of engine coolant in the
cooling system in temperature ranges from 0° to 50°C
using a suction type hydrometer, then determine the
mixing ratio of the coolant by referring to the table at
left.
6B-4-1.tif
6B-4-2.tif