17 00 009 Checking Cooling System For Watertightness

17 00 009 Checking cooling system for water watertightness (N12, N14, N16, N18)

Special tools required:





Warning!
Risk of burning and scalding!
Only perform this repair work after engine has cooled down.

Important!





Open cooling system only when it has cooled down.
Opening the cooling system while hot can result in air entering the system.
This can cause overheating with permanent damage to the engine!





Necessary preliminary work:
Follow notes for carrying out repair work on the cooling system.





Checking pressure drop in cooling system:
Unscrew sealing cap from coolant filler neck.

Connect special tool 17 0 109 to the coolant filler neck.

Connect special tools 17 0 102 and 17 0 101.

Build up excess pressure and wait approx. 2 minutes.

Cooling system is tight if pressure drop does not exceed 0.1 bar.

Checking pressure relief valve in lid:





Connect special tool 17 0 115 to sealing cap (1).

Connect special tools 17 0 101 and 17 0 102.

Pressurize sealing cap.

Compare opening pressure of pressure relief valve.