Approved Coolants - Kohler KD62V12A Operation And Maintenance Manual

Maintenance
Lubricants and operating fluids

5.12.4 Approved coolants

Coolant function
Diesel engine coolant fulfills three functions:
– Heat transfer from the diesel engine and its components to the radiators, without fluid cavi‐
tation
– Corrosion protection and deposit prevention in the cooling system
– Antifreeze protection in the cooling system
Information
Corrosion inhibitors present no cavitation protection. Use of water and corrosion inhibitor only
in the cooling system is not recommended.
Coolant specification
Kohler KD diesel engines are designed to operate with either SI-OAT or hybrid technology with
ethylene glycol basis products as coolant.
The user can choose a ready-to-use preparation or prepare their own blend of water with anti‐
freeze and corrosion-protection agents. Kohler recommends the use of ready-to-use mixture as
it reduces the risk of error in concentration and pollution of the system.
Water specification
When the user wants to blend their own mixture, Kohler recommends the use of fully deionized
water. If the user wants to use tap water, this water must fulfill the requirements for drinking
water according to 2006 WHO (World Health Organization) guideline.
Criteria
Water hardness
pH-value
Chloride (ions)
Sulfate
Bacteria and toxic constituent
Impurities
Conductivity
Tab. 52: KD water requirements
Information
The use of sea water, brackish water, salt water, and industrial waste water is prohibited.
Coolant concentration
Kohler recommends a concentration of antifreeze and corrosion-protection agents of 40% all
year round in power supply applications.
Only coolants with a glycol content lower than 55% are allowed in Kohler KD diesel engines.
Higher concentrations prevent proper heat transfer and are thus forbidden. Should your appli‐
190
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Value
< 2.14 mmol/l (214 ppm)
< 10°dH
6.7 < pH < 9
< 100 mg/l (100 ppm)
< 100 mg/l (100 ppm)
Without
Clear and free
4 < mS
KD62V12A 33521061401_1_1 EN_US
2023-10