2.7.1. Coolant pressure cap Check the pressure valve opening pressure using a expansion tank cap tester. Replace the filler cap assembly if the Radiator Cap measured valve does not reach the specified limit. (pressure valve opening pressure : 0.9 kg/cm 2 ) Caution : Radiator Because it is dangerous to open the pressure cap quickly when coolant is hot, after lowering the inside pressure of the tank by slow-opening at first open it fully. EA5O3002 2.7.2. Cooling water Regarding the cooling water that is to be used for engine, the soft water not the hard water must be used.he use of proper tools and special tools where specified is important to effi- cient and reliable service operation.
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 cylinder liners, detail care is needed.
Since DE12T, DE12TI, DE12TIA and DE12TIS (diesel engine of DE12 series) 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 No. : 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 , loosen the plug for cooling water discharge and fill the plastic cup about a half. - 25 - TECHNICAL INFORMATION