3.8.1. Coolant pressure cap
Check the pressure valve opening pres-
sure using a expansion tank cap tester.
Replace the filler cap assembly if the
measured valve does not reach the spec-
ified limit. (pressure valve opening pres-
sure : 0.9 kg/cm
2
)
NOTE : Because it is dangerous to
open the pressure cap quickly
when coolant is hot,
after lowering the inside pres-
sure of the tank by slow-open-
ing at first open it fully.
3.8.2. Cooling water
•
Regarding the cooling water that is to be used for engine, the soft water not the hard water
must be used.
•
The engine cooling water can be used diluting it with antifreezing solution 40% and the addi-
tive for rust prevention (DCA4) 3 ~ 5 %.
•
The density of above solution and additive must be inspected every 500 hours to maintain it
properly.
Note : The proper density control of antifreezing solution and rust preventing additive will be
able to prevent the rusting effectively and maintain the stable quality of engine. For
the improper control might give the fatal damage to the cooling water pump and cylin-
der liners, detail care is needed.
•
Since D1146/PU086, D1146T/PU086T and P086TI cylinder liner is dry type, particularly the
cooling water control should be applied thoroughly.
•
The density of antifreezing solution and additive for rust prevention is able to be confirmed
by the cooling water test kit. (Fleetguard CC2602M or DAEWOO 60.99901-0038)
•
How to use the cooling water test kit
(1)
When the cooling water temp. of engine is in the range of 10 ~ 55 °C, loosen the plug for
cooling water discharge and fill the plastic cup about a half.
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