Cummins/Onan — DCA Coolant Concentration Test
Maintenance · Cooling system
From a Cummins/Onan owner's manual covering: KT38, KTA19, Kt19, KtA38, KtA50, N-855, NH-672, NH-743, NH-855, NT-855, NTA-855, NTC-270…. Check it applies to your exact model before use.
Applies to: Cummins/Onan Kt19, Cummins/Onan KTA38, Cummins/Onan KTA50
Procedure
- Rinse the plastic dropper pipet several times with engine coolant; fill exactly to the 7.0 ml. mark and discharge into the empty vial.
- Fill the vial to the 10 ml. scribe mark with tap water and mix well.
- Add two or three drops of Solution B and swirl to form a uniform red color.
- Add one drop of Solution A, holding the dispenser vertically, and swirl.
- Continue adding drops of Solution A, counting and swirling between each drop, until the color changes from red to pale grey, green, or blue.
- Record the number of drops required and consult Table 2-5 for coolant condition and recommended maintenance.
Tools required
- Fleetguard DCA Coolant Checking Kit Part No. 3300846-S or Cummins 3375208
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 0-10 drops DANGEROUS; 11-16 FridayParts $36.10 drops BORDERLINE; 17-25 drops ACCEPTABLE; 26-35 drops HIGH ACCEPTANCE; 36-55 drops OVERCONCENTRATED; over 56 drops DANGEROUSLY OVERCONCENTRATED
Full service-parts list: Cummins/Onan Kt19 →, Cummins/Onan KTA38 →, Cummins/Onan KTA50 →
Source: Cummins/Onan owner'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.