Radiator Expansion Tank Cap Test

1.Remove the expantion tank cap (A), wet its seal with engine coolant, then install it on the pressure tester (B) (commercially available). Use a small adapter KE-30-5 (C) (commercially available) to install the expantion tank cap.

 

2.Apply a pressure of 112-146 kPa (1.14- 1.49 kgf/cm2, 16-21 psi).

3.Check for a drop in pressure.

4.If the pressure drops, replace the cap.