Geely Emgrand X7. Manual part — 271

Do not allow the RTV sealant to enter any blind threaded hole. If RTV sealant enters a blind threaded hole, it can
cause hydraulic lock of the fastener when the fastener is tightened. Hydraulic lock of a fastener can lead to
damage to the fastener and/or the components. Hydraulic lock of a fastener can also prevent the proper clamping
loads to be obtained when the fastener is tightened. Improper clamping loads can prevent proper sealing of the
components allowing leakage to occur. Preventing proper fastener tightening can allow the components to loosen
or separate leading to extensive engine damage.

1083

3.2 Clutch system

3.2.1 Fastener specification

3.2.1.1 Fastener Specifications

Specification

Fastener Name

Model

Metric (N.m)

English system

(lb-ft)

Fixing bolt of clutch slave pump

M8×1.25×25

18～22 13.3～18.4

Fixing bolt of clutch slave pump oil pipe

bracket

M8×1.25×16

18～22 13.3～18.4

Fixing bolt of clutch pressure plate and

driven disc

M8×1.25×14

22～33 13.3～18.4

3.2.1.2 General Specifications

Specification

Applications

Metric（mm）

English System

(in)

Outer diameter of clutch pressure plate

276.5

10.9

Outer diameter of clutch driven plate

230

9.1

Worn limiting value of Clutch driven disc (Rivet head depth)

1.95±0.3

0.077±0.011

Flywheel Plane Runout (Interface of clutch drive disc )

0.7

0.028

3.2.2 Description and operation

3.2.2.1 Description and operation

The clutch assembly is located between the engine and the transmission, and is retained to the flywheel rear
surface by fixing bolt . The clutch spline hub and transmission input shaft form rigid connections. During driving,
the driver can press or release the clutch pedal according to requirement, to temporarily separate the engine and
the transmission or gradually connect them in order to cut off or pass the input power from the engine to the
transmission. Clutch system mainly includes the following components:

z Driving parts: Clutch pressure plate , Clutch pressure plate is fixed on the flywheel by bolts.

z Driven parts: clutch disc with a spline hub. Spline hub slides freely along the input shaft in axial direction,

and drives the input axis. Driving parts and driven parts maintain contact through spring pressure. The
pressure is applied by the diaphragm spring in the pressure plate assembly.

z Working parts: Clutch separation system consists of the clutch pedal, disengaging shaft, fork and Release

bearings. When the clutch pedal is pressed, the Release bearings are pushed. Bearings then push the
separation rod within the pressure plate and then the clutch is separated.

1084

3.2.3 System operating principle

3.2.3.1 System Operating Principle

1. Ensure vehicle smooth start:

Before start, the vehicle is in stationary state. If the engine and transmission have a rigid connection, once a gear
is engaged, vehicle will suddenly move forward because of the suddenly transmitted power. It will not only cause
damage to mechanical parts, but also the driving force is not enough to overcome the enormous inertia caused by
the forward force, so that the rapidly decrease in engine speed will shut down the engine. If a clutch is used when
starting, the engine and transmission will be temporarily separated, and then the clutch will gradually engage. Due
to the sliding between the clutch driving parts and the driven part, the torque transmitted from the clutch gradually
increases from zero, while the vehicle driving force gradually increases, so that the vehicle starts smoothly.

2. Easy to shift:

During driving, there is a need to frequently switch to different gears in order to adapt to changing driving
conditions. If there is no clutch to temporarily separate the engine and transmission, then the transmission
meshing gears will be hard to separate due to the unreleased load. In addition, gears with different circumferential
speeds are difficult to mesh. Even if forced into the mesh, there will be a huge impact on tooth side and cause
damage to parts. Use the clutch to temporarily separate the engine and transmission, then pressure between
meshing surfaces of the original pair of gears will be greatly reduced due to load released, and thus they are easy
to separate. For the other pairs of meshing gears, because the gear is separated from the engine and the inertia is
small, it can make the gears meshing circumferential speed to be equal to or close to equal just using appropriate
shifting action, so as to avoid or mitigate the impact between gears.

3. Prevent the transmission system overload:

During emergency braking, the wheel speed suddenly decreases. Transmission system is connected to the engine
and has the rotation inertia, so it remains the original speed, which generates a far greater inertia torque than the
engine, causing damage to the powertrain parts. As the clutch relies on friction to transmit torque, so when the
transmission system load exceeds the friction torque, the clutch drive parts and driven parts will skid, thus to
prevent the overload.

1085

3.2.4 Disassemble drawings

3.2.4.1 Clutch control mechanism

2

2

9

8

11

4

12

3

5

6

10

7

1

NL03-0004c

1. Oil outlet pipe assembly of master pump

2. Fixing nut of clutch master pump

3. Pin

axle

4. Pin axle lockpin

5. Clutch pedal mounting nolt

6. Clutch

pedal

7. Clutch pedal mounting nut

8. Clutch pedal return spring

9. Clutch pedal support

10. Oil Inlet hose for master pump

11. Retaining clamp for oil inlet hose for master

pump

12. Clutch master pump assebmly

1086