The junction of the exhaust manifold with the mating surface of the cylinder head is sealed with a metal gasket.
If the gasket has burned out or the manifold mounting nuts have become loose, exhaust gases may leak out through this connection, which is accompanied by a characteristic sound.
If tightening the exhaust manifold mounting nuts does not eliminate the defect, the gasket must be replaced.
To avoid burns, it is recommended to start work after the exhaust system has cooled down.
Turn off the ignition.
We remove the high-voltage wire tips from the spark plugs and move the wires to the side.
Disconnect the oxygen concentration sensor wiring harness from the engine management system wiring harness (see Removal oxygen concentration sensors).
Remove the catalytic converter (see Removal the catalytic converter).
Using a special penetrating liquid, wet the nuts securing the exhaust manifold to the cylinder head.
Using a 14 mm socket, unscrew the eight nuts securing the exhaust manifold to the cylinder head.
When performing this operation, the nuts may come off together with the studs.
We move the exhaust manifold along the remaining studs of the cylinder head and remove it upwards.
We remove the metal gasket of the exhaust manifold.
We apply a thin layer of thread sealant to the threaded part of the stud that is screwed into the cylinder head.
Further assembly is carried out in reverse order.
Before installing the exhaust manifold, clean the mating surfaces of the cylinder head and exhaust manifold from carbon deposits and install a new gasket.
Before tightening the exhaust manifold mounting nuts, apply graphite grease to the cylinder head studs.
Tighten the exhaust manifold mounting nuts to the specified torque (see Applications).
Tightening order of exhaust manifold mounting nuts