We remove the exhaust manifold when replacing gaskets, also when repairing the cylinder head
Preparing the car for repair work.
We install the car on a viewing ditch or on a lift.
Disconnect the negative terminal from the battery
From the bottom of the car, we unscrew and remove the protection of the power unit (article - Removing the protection of the Nissan Almera power unit)
Disconnect the downpipe from the manifold.
To do this, use a 14 key to unscrew the two nuts securing the intake pipe (Figure 2).
Remove the springs from the studs (the nut may come loose with the stud)
Remove the exhaust pipe flange from the exhaust manifold flange and remove the spherical ring from the exhaust manifold flange
The bottom of the exhaust manifold supports a bracket attached to the cylinder block (Figure 5, shown with wheel drive removed).
With a 16 head or a spanner wrench, unscrew the nut 1 and bolt 2, fastening the bracket to the cylinder block
Remove the manifold mounting bracket
Remove the air filter housing.
With a 10 head, we unscrew five bolts securing the upper heat shield.
Before unscrewing, we moisten the threads with WD-40 penetrating fluid, or brake fluid.
Remove the control oxygen concentration sensor (if the exhaust manifold needs to be replaced).
To do this, disconnect the block of the wire harness to the sensor.
We pass the 22 spanner through the wire.
Unscrew the oxygen concentration sensor
Remove the oxygen concentration sensor from the exhaust manifold hole.
Wet the collector mounting nuts with penetrating liquid WD-40 or kerosene
With a head of 10, we unscrew the nine nuts securing the exhaust manifold flange to the cylinder head
Remove the collector assembly with the lower heat shield
Remove the exhaust cylinder gasket
If the collector is to be replaced, then unscrew the five nuts securing the lower heat shield and remove it.
Before mounting the collector, we clean all surfaces and inspect the parts.
Before tightening the manifold nuts, apply graphite grease to all manifold studs.
Tighten the manifold fastening nuts sequentially from the center to the edge.
The nuts should be tightened to a torque of 18 Nm.