A6 Sedan V6-2.8L (AHA) (1998)
Oil Pressure Regulator Valve: Service and Repair
Oil Check Valve, Replacing
Note: If irregular valve noise occurs repeatedly during short drives and disappears after extended driving, the oil check valves must be replaced.
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Remove intake manifold.
Tightening torque: 10 Nm (7 ft. lbs.).
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Remove breather housing located below intake manifold.
Tightening torque: 10 Nm (7 ft. lbs.).
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Replace oil check valves -1-.
Tightening torque: 25 Nm (18 ft. lbs.).
Note: The oil distribution pipe -2- for the oil spray jets for piston cooling is also located in the opening.