Cummins/Onan — DCA Coolant Concentration Test Procedure
Testing & diagnosis · Cooling system
From a Cummins/Onan operator's manual covering: KT-1150, KT-1150-C450, KT-1150-P450, KT-2300, KT-2300-C900, KT-2300-P900, KTA-1150, KTA-1150-C525, KTA-1150-C600, KTA-1150-P600, KTA-2300, KTA-2300-C1050…. Check it applies to your exact model before use.
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Before you start
- Concentrations in excess of limits can cause sludge to form in the water filter.
Procedure
- Dilute one part engine coolant with nine parts tap water; mix well.
- Fill vial to scribe mark with diluted coolant; add two or three drops nitrite indicator solution and swirl to uniform red.
- Add nitrite test solution 'A' one drop at a time, mixing between drops, until color changes from red to pale blue, gray or green.
- Record number of drops and consult Table 2-2 for coolant condition and maintenance required.
Tools required
- Fleetguard DCA Coolant Checking Kit Part No. 3300846-8 or Cummins 3375208
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Acceptable DCA 1.3 to 2.0 oz per gallon
- Borderline 0.7 to 1.2 oz per gallon
- Dangerous 0 to 0.6 oz per gallon
Source: Cummins/Onan operator's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.