1. SCR Coolant Circuit Flow Test
Tier 4 Final – AE Training

2. Objective Understand when the test must be run Understand the tools
Test conditions
Test operation

3. Coolant System Design QSB6.7

4. Coolant System Design QSB6.7

5. Scope
Tier 4 Final (AEB24.60, 24.61, 24.62)
SCR Components requiring coolant
Dosing Module (DM)
DEF Tank

6. Tools
Two Flow Measuring Devices accurate for the +/-5% over the targeted flow range.
Pressure Sensor + Restriction Curves
OR Flow Meters
Calterm (or voltage source to actuate coolant valve)
Data logger for temperature and flow/pressure

7. Test Setup

8. Test Conditions Speed: Highest normal operating speed, up to 2100RPM
Engine Conditions:
If your machine will incorporate a TK by-pass, ensure that you are testing with the this component enabled.
All OEM accessories using engine coolant should be flowing coolant when performing this test.

9. Pass/Fail Criteria *Max done with thermostat closed
*Min done with thermostat open

10. Data Capture

11. Things to note
If your machine will incorporate a TK by-pass, ensure that you are testing with the this component enabled.
All OEM accessories using engine coolant should be flowing coolant when performing this test.

12. Example – QSB6.7 Power Unit
Line lengths are shorter than Cummins Pre-engineered system
Test setup for this installation

13. Opening Coolant Valve Test Condition
Use Calterm Parameter Overrides
O_UTC_TankHeater1_Enbl = 1, Reset to 0 after test
O_UTC_TankHeater1_Val = 100 %, Reset to 0 after test
OR apply the appropriate voltage to valve to actuate it (12V or 24V)

14. Conclusion Data collection Pass/Fail Flow rates for: 2 ConditionsDM
Engine Supply
DEF Tank Header
2 Conditions
Open Thermostat
Closed Thermostat
Pass/Fail
Compare data to that found in the AEB
Re-design as necessary