Geely Emgrand X7. Manual part — 238

pressure has not reached normal levels. Add engine oil in the cylinder, the pressure increased
significantly.

C. Valve Fault: The first stroke pressure is low, and can not be increased in the following strokes.

Add engine oil in the cylinder, the pressure is not increased.

Test is completed.

2.13.7.4 Engine Noise Diagnosis

Engine vibration is actually referring to the engine resonance noise. When the engine's vibration
frequency is the same as the vibration frequency of a fault, the noise will be perceived. Severe
vibrating usually generates big noise, and it is generated by internal parts fracture or serious
engine wear and tear. A slight vibration can be heard, but the sound is not big. Slight vibration is
due to the engine internal components wear, loose or engine external components broken and it
can lead to serious or slight vibration. In the engine noise diagnostic, the resonance noise cause
must be found in order to eliminate the fault.

2.13.7.5 Noisy when there is engine load

1

Inspect whether the tension of the drive belt is too tight or strained?

2

Inspect the exhaust system. Whether the system is interfered with the other body
components or scraping to ground?

3

Inspect the existence of the flywheel cracking, deformation and other components
intervention. Is the flywheel normal?

4

Inspect whether the main bearing clearance is too large, and if it exceeds the specified
value.

Standard value (0.006～0.022mm/0.0002～0.0008in)

Yes

Replace the main bearings. Confirm
whether the fault is fixed.

No

Yes

Replace the flywheel assembly. Confirm
whether the fault is fixed.

No

Yes

Relocate and install the exhaust system to
confirm whether the fault is fixed.

No

Yes

Replace/adjust the drive belt to the specified value,
and confirm whether the fault is fixed.

No

Next

951

Standard value (0.020～0.044mm/0.0007～0.0017in)

6

Confirm that the fault is fixed.

5

Inspect connecting rod bearing clearance, and does it exceed the specified value?

Yes

Replace the connecting rod bearings.Confirm
whether the fault is fixed.

No

952

2.13.7.6 Slight Vibration When Engine Is Warming Up

1

Use fault diagnosis tester to read the "Knock" related to data. Is the engine knocking?

2

Inspect whether there is exhaust manifold leakage?

3

Inspect connecting rod bearing clearance, and does it exceed the specified value?

Standard value (0.020～0.044mm/0.0007～0.0017in)

4

Confirm that the fault is fixed.

Yes

Replace the connecting rod bearings.Confirm
whether the fault is fixed.

Next

Yes

Replace the exhaust pipe pad and tighten
the exhaust pipe again.

No

Yes

Inspect the engine timing systems and fuel
quality, repair the faulty part.

No

953

2.13.7.7 Vibration at Idle and When Engine Is Warming Up

1

Inspect drive belt tension. Is it too loose or worn? Any fault?

2

Inspect whether the viscosity of the engine lubrication oil is abnormal?

3

Inspect whether the generator and air-conditioning compressor is working properly.
Any abnormal sound during working?

4

Inspect the valve, valve spring and other valve components. Any fault?

5

Inspect the piston pin gap. Does it exceed the specified value?

Standard value (0 . 005～0 . 011mm/0 . 0002～0 . 0004in)

6

Inspect whether the connecting rod is bent?

7

Inspect piston to cylinder gap value. Does it exceed the specified value?

Standard value (0 . 060～0 . 083mm/0 . 0023～0 . 0033in)

Yes

Replace failed components, confirm
whether the fault is fixed.

No

Yes

Replace failed components, confirm
whether the fault is fixed.

No

Yes

Replace failed components, confirm
whether the fault is fixed.

No

Yes

Replace failed components, confirm
whether the fault is fixed.

No

Yes

Refill engine lubrication oil suitable for the current season
temperature, confirm whether the fault is fixed.

No

Yes

If necessary, replace the drive belt.
Confirm whether the fault is fixed.

No

954