Air-leaks: in the intake system, checking: Removal

Preparations 

Check that all hoses are undamaged. Check that all hoses are in place with their hose clips tightened.

Connect the test pressurization equipment 

Fig 1: Identifying Hose Clap And Turbocharger (TC)

Courtesy of VOLVO CARS OF NORTH AMERICA.

Remove: 

• the hose clamp (2) between the mass air flow (MAF) sensor and the intake manifold for the turbocharger (TC)
• the screws for the intake manifold. Fold the pipe up. Connect tool 9995545 and pressure regulator 9995544 to the intake manifold. Tighten the hose clamp.

Check 

Fig 2: Gentle Hissing Sound Heard From Oil Filler Opening

Courtesy of VOLVO CARS OF NORTH AMERICA.

Remove the oil filler cap. Connect the compressed air hose. Adjust the regulator to obtain a maximum pressure of 0.3 bar  .

There may be a gentle hissing sound from the oil filler opening. This is due to the opening of an intake valve and the leakage of cylinder pressure past the piston rings. If a leak is suspected, spray a soap solution onto the area. Remedy any leakage.