18 40 050 Removing and installing/replacing front exhaust manifold (N52K)
WARNING: This page is about a different variant/trim than selected.
WARNING:
Risk of injury!
Refrigerant circuit is under high pressure!
Follow safety instructions for handling refrigerant See 6450... INSTRUCTIONS FOR HANDLING REFRIGERANT R 134A or 6450... SAFETY INSTRUCTIONS FOR HANDLING REFRIGERANT R134A .
Avoid contact with refrigerant and refrigerant oil
Follow safety instructions for HANDLING REFRIGERANT OIL .
Refrigerant circuit is under high pressure!
Follow safety instructions for handling refrigerant See 6450... INSTRUCTIONS FOR HANDLING REFRIGERANT R 134A or 6450... SAFETY INSTRUCTIONS FOR HANDLING REFRIGERANT R134A .
Avoid contact with refrigerant and refrigerant oil
Follow safety instructions for HANDLING REFRIGERANT OIL .
IMPORTANT:
Risk of damage!
Restart engine only when A/C system has been correctly filled.
Follow INSTRUCTIONS for opening and replacing parts in refrigerant circuit.
If A/C system is opened for more than 24 hours:
Replace DESICCANT INSERT for A/C system.
Restart engine only when A/C system has been correctly filled.
Follow INSTRUCTIONS for opening and replacing parts in refrigerant circuit.
If A/C system is opened for more than 24 hours:
Replace DESICCANT INSERT for A/C system.
Necessary preliminary tasks
- Remove REAR EXHAUST MANIFOLD
- Drain off AIR CONDITIONING SYSTEM
NOTE:
The oxygen sensors are in danger of being damaged when the exhaust manifolds are removed and installed.
Remove CONTROL SENSOR from cylinders 1 to 3.
Remove MONITOR SENSOR from cylinders 1 to 3.
Release screws (1).
Tightening torque 64 52 1AZ .
Detach pressure and suction lines from A/C compressor.
Installation:
Replace all sealing rings and moisten with refrigerant oil.
Unscrew nuts.
Remove exhaust manifold (1).
Installation:
Clean sealing faces and replace seals.
Replace nuts.
Tightening torque 18 40 1AZ .
Assemble engine.
Evacuate and fill A/C SYSTEM .
Check exhaust system for leaks.