2. MAJOR MAINTENANCE
2.1 Preventive Maintenance
The preventive maintenance means that the operator performs the servicing of engine to obtain long life
and best performance from DOOSAN diesel engine.
2.1.1 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 additive 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 DE08TIS diesel engine cylinder liner is dry type, particularly the cooling water control should be
applied thoroughly by the cooling water test kit. (DOOSAN 60.99901-0038)
·The density of antifreezing solution and additive for rust prevention is able to be confirmed by the cooling
water test kit. (DOOSAN 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.
Note:
In taking the cooling water sample, if the water in auxiliary tank were taken, it is hard to
measure the accurate density. Take the cooling water sample necessarily loosening the
cooling water discharge plug.
(2) A t the state of a test paper soaked in the sampled water, after taking the paper out through water
agitation, shake off the water.
(3) Wait for about 45 sec. till the color change of test paper.
Note:
However, it should not elapse longer than 75 sec, and if it did, the hue would change.
(4) Make the numerical value by comparing the test paper which hue has changed with the color list of
label on storage bottle.
(5) By comparing the hue changed into yellowish green or so with the green color indication of test paper
storage bottle, confirm the density. (Then, the density indication must be in the hue range of 33% to
50%).
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