Geely Emgrand X7. Manual part — 131

2.7.5.6 Precautions on Maintenance of Exhaust System

Warning: Warning on Exhaust Service

Warning: The broken three-way catalytic converter must be replaced. It is not allowed to
remove the exhaust system of three-way catalytic converter , otherwise, there will be serious
air pollution.

Important precaution : In the following conditions, three-way catalytic converter may be
damaged or malfunction:

z Work exceeds the range of closed-loop mixture control system.

z Engine burns a large amount of engine oil.

z The three-way catalytic converter exhaust temperature is too high (higher than 840°C).

Precautions:

z Vehicles with three-way catalytic converter can not use leaded petrol. Lead will

pollute the three-way catalytic converter.

z Do not drop the three-way catalytic converter, as this may damage the ceramic carrier.

z Do not allow water, engine oil or fuel enter into the converter, because this may

contaminate the ceramic substrate.

z Do not start the vehicle when there is engine misfire or the spark plug wire is

disconnected.

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2.7.6 Removal and installation

2.7.6.1 Replacement of Exhaust Manifold

Dismantlement Procedure

1. Disconnect the battery negative

electrode cable. Refer to 2.12.6.1
Battery Disconnection.

2. Dismantle left right fixing nut of

front air exhaust pipe assembly .

Note: Dismantling the bolt when it
is hot is likely to damage the bolt or
flange nuts weld on the exhaust
manifold. Dismantle the bolt when
the engine is cooled down.

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3. Remove the M10×22 bolt from

the cylinder block and loosen the
M10 nut to remove the left
mounting plate of the exhaust
manifold.

Note: Dismantling the bolt when it is
hot is likely to damage the bolt or
flange nuts weld on the exhaust
manifold. Dismantle the bolt when
the engine is cooled down.

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4. Remove the M10×22 bolt from

the cylinder block and loosen the
M10 nut to remove the right
mounting plate of the exhaust
manifold.

Note: Dismantling the bolt when it is
hot is likely to damage the bolt or
flange nuts weld on the exhaust
manifold. Dismantle the bolt when
the engine is cooled down.

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524

5. Remove the four M8×22 bolts

from the exhaust manifold and
the exhaust manifold upper heat
shield.

Note: Dismantling the bolt when it is
hot is likely to damage the bolt or
flange nuts weld on the exhaust
manifold. Dismantle the bolt when
the engine is cooled down.

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6. Remove the two M8×22 bolts

from the exhaust manifold and
the exhaust manifold lower heat
shield.

Note: Dismantling the bolt when it is
hot is likely to damage the bolt or
flange nuts weld on the exhaust
manifold. Dismantle the bolt when
the engine is cooled down.

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7. Remove the four M8×12 bolts

from the exhaust manifold and
the three-way catalytic device
heat shield.

Note: Dismantling the bolt when it is
hot is likely to damage the bolt or
flange nuts weld on the exhaust
manifold. Dismantle the bolt when
the engine is cooled down.

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525

8. Dismantle the exhaust manifold

bolts and nuts according to the
sequence in the graph.

Dismantling the exhaust manifold
bolts at high temperature may
damage the bolts or cylinder head.
Wait until the engine cooling down
before removal.

3

1

4

5

2

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9. Dismantle the exhaust manifold.

10. Remove the exhaust manifold

gasket from the double end stud
of the cylinder head.

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Installation Procedure:

1. Install the exhaust pipe to engine

bracket bolts.

Torque: 35-45 N . m(Metric) . 25.
8-33 . 2 lb-ft(English system)

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