Checking Cooling System For Leaks (M54)

Checking Cooling System For Leaks (M54)

Special tools required:
^ 17 0 101
^ 17 0 105
^ 17 0 106

Warning!
Danger of scalding!
Only perform this work after engine has cooled down.

Checking pressure drop in cooling system:





Open cap on coolant expansion tank. Fit special tools 17 0 101 / 17 0 105

Build up gauge pressure of 1.5 bar, wait approximately 2 minutes.

Cooling system is impervious to leaks if pressure drop is maximum 0.1 bar.

Checking pressure relief valve in cap:





Screw sealing cap (1) onto special tool 17 0 106.

Build up pressure with special tool (hand pump) 17 0 101, observe pressure gauge to ascertain when opening pressure is reached.

Compare opening pressure of pressure relief valve.