If the intake manifold is leaking, the engine starts to run unevenly (troit)

If tightening the intake manifold mount fails to eliminate the leakage, then the gasket must be replaced

To replace the intake manifold gasket, you need tools: Torx T25 wrench, socket 10 and screwdrivers

Preparing the car for the task

We reduce the fuel pressure, as described in the article "How to check compression in the Mazda 6 engine cylinders"

Disconnect the negative battery terminal

Replacing Mazda 6 intake and exhaust manifold gaskets

Disconnecting the air inlet

Replacing Mazda 6 intake and exhaust manifold gaskets Replacing gaskets for the intake and exhaust manifold of the Mazda 6 engine

We move the latch and disconnect the wire block from the cover of the throttle assembly

Replacing Mazda 6 intake and exhaust manifold gaskets Replacing gaskets for the intake and exhaust manifold of the Mazda 6 engine

Disconnect the fuel line from the fuel rail

Disconnect the adsorber purge hose from the intake manifold fitting

Replacing Mazda 6 intake and exhaust manifold gaskets

Unscrew the screw securing the oil level indicator bracket

Unscrew the intake manifold mounting bolts

Replacing Mazda 6 intake and exhaust manifold gaskets Replacing gaskets for the intake and exhaust manifold of the Mazda 6 engine

The location of the intake manifold mounting bolts is shown in the picture

Replacing Mazda 6 intake and exhaust manifold gaskets

Carefully move the collector to the side

Replacing Mazda 6 intake and exhaust manifold gaskets Replacing gaskets for the intake and exhaust manifold of the Mazda 6 engine

Squeeze the bent antennae of the hose clamp and slide the clamp along the hose

Disconnect the hose from the oil separator valve

Replacing Mazda 6 intake and exhaust manifold gaskets Replacing gaskets for the intake and exhaust manifold of the Mazda 6 engine

Remove the intake manifold assembly with the throttle assembly

Remove old gaskets

Install new gaskets and intake manifold

We tighten the fastening bolts evenly crosswise with a torque of 15 Nm (1.5 kgf.m), starting from the outer bolts and moving on to the middle ones

Install all removed parts in reverse order

When installing the fuel rail, install new fuel rail O-rings injectors

Removing the drives of the intake manifold geometry change system

Removing intake manifold geometry actuators

Remove the intake manifold as described above

Removing the intake manifold geometry actuatorsRemoving the geometry modification actuators intake manifold

We unscrew the three screws securing the pneumatic actuator of the intake manifold geometry change system

Removing the pneumatic actuator

Removing the intake manifold geometry actuatorsRemoving intake manifold actuators intake manifold

This is how the pneumatic actuator of the intake manifold geometry change system looks like

We unscrew the two fastening screws and remove the second pneumatic actuator

Install the pneumatic actuators in reverse order

Exhaust manifold gasket replacement

The exhaust manifold gasket is a molded metal strip

If the gasket is broken, there is a breakthrough of exhaust gases (collector cuts)

Replacing Mazda 6 intake and exhaust manifold gaskets

If tightening the collector fails to fix the problem, then we replace the gasket

Replacing Mazda 6 intake and exhaust manifold gaskets Replacing gaskets for the intake and exhaust manifold of the Mazda 6 engine

We unscrew the seven nuts securing the exhaust manifold to the cylinder head

Move the exhaust manifold and take out the old gasket

Installing a new gasket and exhaust manifold

Replacing Mazda 6 engine intake and exhaust manifold gaskets

We tighten the fastening nuts in the order shown in the figure and tighten with a torque of 43-64 Nm