17 00 009 Checking cooling system for water leaks

NOTE:

Special Tools Required:

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

NOTE: Illustrations show M54:

Checking Pressure Drop In Cooling System:

Open cap on coolant expansion tank. Fit special tools 17 0 101 / 17 0 113.

Build up gauge pressure of 2 bar, wait approx. 2 minutes.

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

Fig 1: View Of Pressure Tester

Courtesy of BMW OF NORTH AMERICA, INC.

Checking Pressure Relief Valve In Cap:

NOTE: Coolant residue can cause the pressure relief valve in the cap to stick, therefore repeat the check procedure on the cap 2-3 times.

Screw cap (1) onto special tool 17 0 114.

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

Opening pressure of pressure relief valve.

Fig 2: Identifying Pressure Tester Components

Courtesy of BMW OF NORTH AMERICA, INC.