Maintenance
Lubricants and operating fluids
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 Value
Water hardness < 2.14 mmol/l (214 ppm)
< 10°dH
pH-value 6.7 < pH < 9
Chloride (ions) < 100 mg/l (100 ppm)
Sulfate < 100 mg/l (100 ppm)
Bacteria and toxic constituent Without
Impurities Clear and free
Conductivity 4 < mS
Tab. 38: 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‐
cation need additional antifreeze protection (arctic conditions), please contact your Kohler Co.
representative for additional information.
Coolant monitoring
Kohler recommends a close monitoring of the coolant to prevent diesel engine damage by cavi‐
tation, corrosion, overheating, or freezing. Monitoring of the coolant can extend the exchange
period of the fluid for up to 6 years for SI and SIOAT-based coolants. It can extend the exchange
period of the fluid for up to 4 years for hybrid technology coolants.
Kohler recommends the following list of parameters to be checked by coolant analysis at least
once a year. However, the user should always check with their coolant provider what the
recommendations for analysis and monitoring of their coolant are, according to engine oper‐
ating conditions.
Information
Topping up the cooling system with inadequate water or non-compatible coolant mixtures can
lead to precipitation in the fluid and malfunction of the engine.
Parameter Unit Method
Visual appearance / color - Visual
Water hardness mmol/l
ppm
EN/ISO 11885
154
© 2022 by Kohler Co. All rights reserved.
KD62V12 33521030301_8_1 EN_US 2022-09
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