Isuzu engine 4j series. Manual — part 61
6B - 4 ENGINE COOLING
7.
Install and tighten radiator cap and start the engine. After
idling for 2 to 3 minutes, stop the engine and reopen
radiator cap. If the water level is lower, replenish.
WARNING:
When the coolant is heated to a high temperature, be
sure not to loosen or remove the radiator cap.
Otherwise you might get scalded by hot vapor or
boiling water. To open the radiator cap, put a piece of
thick cloth on the cap and loosen the cap slowly to
reduce the pressure when the coolant has become
cooler.
8.
After tightening radiator cap, warm up the engine at about
2,000 rpm.
Set heater adjustment to the highest temperature position,
and let the coolant circulate also into heater water system.
9.
Check to see the thermostat has opened through the
needle position of water thermometer, conduct a
5 minutes idling again and stop the engine.
10.
When the engine has been cooled, check filler neck for
water level and replenish if required. Should extreme
shortage of coolant is found, check the coolant system and
reservoir tank hose for leakage.
11.
Fill the coolant into the reservoir tank up to “MAX” line.
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 solution + 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
6B - 6 ENGINE COOLING
ON-VEHICLE SERVICE
WATER PUMP
REMOVAL
Preparation:
•
Disconnect battery ground cable.
•
Drain coolant
1. Fan Shroud
•
Remove the reservoir tank hose, bypass hose and fan
guide.
2. Cooling Fan Assembly
•
Remove lock nut and take out cooling fan assembly.
3. Power Steering Pump Drive Belt
•
Loosen the idler pulley lock nut and loosen adjust bolt,
and remove the drive belt.
4. A/C Compressor Drive Belt
•
Loosen A/C compressor idler pulley lock nut and
adjust bolt and remove the drive belt.
6B-5-2.tif
6B-5-3.tif
6B-5-1.tif
Removal steps
1. Fan shoroud
2. Cooling fan Assembly
3. Power steering pump drive
belt
4. A/C compressor drive belt
5. AC generator drive belt
6. Crankshaft damper pulley
7. Timing pulley upper cover
8. Timing pulley lower cover
9. Water pump Assembly
Installation steps
To install, follow the removal
steps in the reverse order.
ENGINE COOLING 6B - 7
5. AC Generator Drive Belt
•
Loosen AC Generator mounting bolt (under side) and
adjust plate lock bolt, and remove the drive belt.
6. Crankshaft Damper Pulley
7. Timing Pulley Upper Cover
8. Timing Pulley Lower Cover
9. Water Pump Assembly
•
Remove the O-ring
INSPECTION
Make necessary parts replacement if extreme wear or
damage is found during inspection. Should any of the
following problems occur, the entire water pump
assembly must be replaced.
•
Cracks in the coolant pump body
•
Coolant leakage from the seal unit
•
Play or abnormal noise in the bearing
•
Cracks or corrosion in the impeller
6B-6-1.tif
6B-6-2.tif
6B-6-3.tif
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