48 Cooling System Testing Procedure Run the engine to operating temperature. After the engine has reached operating temperature, move the heater controls (on dash and in sleeper) to full heat and run the engine for 10 more minutes. EXAMPLE Step 1 Desired 2.3 units Recom- SCA level per gallon mended level 1.5- 3.0 units WARNING Subtract: - per gallon Coolant 1.5 units Hot engine. Keep yourself clear of all hot engine parts and/or fluids. A hot engine and/or can cause serious burns. test results per gallon = Required 0.8 units Shut off the engine and allow it to cool. Test the coolant with the test kit. Depending on the concentration of SCA in the coolant:
SCA per gallon per gallon increase If the SCA concentration is below 1.5 units per gallon (0.4 units per liter), replace the coolant filter and calculate the required units of SCA to reach the desired SCA level. See example. Between 1.5 and 3.0 units per gallon (0.4 and 0.8 units per liter), replace the coolant filter, P/N 3945411. Above 3.0 units per gallon (0.8 units per liter). DO NOT replace the coolant filter until further testing at the next oil change indicates that the level has dropped below 2.3 units per gallon (0.6 units per liter). Step 2 Cooling 13 US system gallons Use actual system capacity Multiply capacity by:
x Required SCA per 0.8 units per gallon gallon increase = Total SCA 10.4 units Round up CAUTION units required (11 units) to nearest whole SCA levels deplete during normal operation and when coolant is added because of low coolant level. SCA levels should be maintained at the middle of the recommended interval. Unit per gallon: 1.5 LOW - 2.3 MID - 3.0 HIGH Units per liter: 0.4 LOW - 0.6 MID - 0.8 HIGH number FIND- Use one (8 unit) filter, P/N 3945411 and INGS See “Cooling System Capacity*” page 142 for system quantities. 3 units liquid SCA