Geely Emgrand X7. Manual part — 110

2.6.7.5 Drive belt inspection

1. When engine is cooling, or after

engine stops for 30min Recheck

2. Visually inspect whether V-belt

has serious abrasion or curtain
line.

Wear and the like If faults are found,
replace the V-drive belt.

3. Visually inspect whether the

interior side and edge of belt
have damage and abrasion.

Is there a crack? If yes, replace with
new belt.

4. Visually inspect whether there

are situation 2 and 3 on belt,

Tension measurement: rotate the
crankshaft belt pulley with two circles
clockwise to measure

The belt tension between the belt
pulleys is uniformly distributed when
measuring.

损坏老化的传动皮带

传动皮带安装

正确配合

A

FE02-7000b

New belt

Old belt

Belt tension (N/lb)

400±-500/89.9±-112.4 300±-400/67.4±-89.9

5. Measure the belt load with a sound pressure meter (a universal repair tool)

Record the tension and frequency of the point A.

A. Replace with new drive belt. Rotate the crankshaft two laps clockwise, so that the drive belt

completely runs through the drive pulley. Measure the tension at marked position A. Refer to
the table for the range and replace the drive belt if the measurement is beyond the scope of
the table.

B. If the used drive belt (the old belt) has the tension beyond the scope of the table, replace it

with a new drive belt.

C. During the drive belt installation, please make sure the correct installation to the drive pulley

groove.

D. Do not drop engine oil or engine coolant onto the drive belt.

E. Do not over-wind or bend the drive belt.

1. Drive belt chirp sound diagnosis

Diagnostic Hints: The symptom may be due to wet drive belt or pulley and may be an
intermittent fault. Drive belt may need to spray a small amount of water to reproduce customer

Damaged and aged

drive belt

Drive belt installation

Correct matching

439

reported fault. If the symptom reoccurs after spraying water, then clean the pulley. Loose or
unreasonable installation of body components, suspension components or other vehicle parts can
also cause the chirp sound.

Fault Definition: The following conditions are the drive belt chirp sound symptoms

z A chirp jack noise can be heard once the drive belt rotates a lap.

z Noise often happens on a rainy day or in a cold morning.

1

Verify the fault. Does the engine have chirp sound?

2

Dismantle the drive belt to confirm whether the giggle does not arise again?

A. Dismantle the drive belt. Refer to 2.6.8.3 Replacement of Drive Belt.

B. Run the engine, but no more than 30 s.

Does the scream disappear?

3

Inspect whether the drive belt surface is normal? (do not have ball, crack, etc)

Refer to 2.6.7.5 Drive Belt Inspection

4

Inspect whether the drive belt pulley is installed correctly? (do not happen
misalignment)

5

Inspect whether the drive pulley is normal?

Inspect whether the pulley is bent, twisted and so on.

No

Replace the failed pulley.

Yes

No

Reinstall the drive pulley. If necessary,
replace the drive belt.

Yes

No

Refer to 2.6.8.3 Replacement of Drive Belt
to replace the drive belt.

Yes

No

Refer to 2.6.7.4 Engine Noise Diagnosis

Yes

No

To Diagnostic Hints

Yes

440

6

Inspect whether all fasteners associated with the drive belt are normal?

7

Replace the drive belt. Confirm the fault is fixed.

2. Shriek diagnosis of drive belt

Diagnostic Hints: Loose or unreasonable installation of body, suspension and other components
may cause screams. If there is intermittent noise, inspect the attached components by changing the
engine load. It is recommended to inspect whether the air-conditioning system is over filled,
power steering hose is clamped, the power steering fluid is correct or whether the generator is
faulty.

Fault Definition: The following conditions are the drive belt screams symptoms

z Scream is caused by drive belt slippage.

z Noise appears when a big load added to the drive belt, such as air-conditioning system

compressor starting, the running engine with the throttle quickly opening or drive belt
skidding in a drive component.

1

Verify the fault. Does the engine scream?

2

Dismantle the drive belt. Confirm whether the scream disappears?

A. Dismantle the drive belt. Refer to 2.6.8.3 Replacement of Drive Belt.

B. Run the engine, but no more than 30 s.

Does the scream disappear?

Pulley bearings do not appear stuck, loose and so on.

3

Inspect whether the bearings of all accessory drive belt pulleys are normal?

4

Inspect whether drive belt tensioner device is working properly?

No

Replace the damaged pulley or bearing.

Yes

No

Refer to 2.6.7.4 Engine Noise Diagnosis

Yes

No

To Diagnostic Hints

Yes

No

Tighten loose fasteners.

Yes

441

Tensioner pulley bearing should not occur sticking, loose or other conditions. The tensioner should
not occur breakage, loose or other conditions.

5

Inspect whether the correct drive belt is used?

Refer to 2.6.7.4 “Drive Belt Inspection” to inspect for the extension of the drive belt.

6

Inspect whether all fasteners associated with the drive belt are normal?

7

Inspect whether the drive pulley is normal?

Inspect whether the pulley is bent, twisted and so on.

8

To Diagnostic Hints

3. Diagnostic for Drive belt with whine

Diagnostic Hints: Drive belt should not produce hum sound. If there is an intermittent noise,
inspect the attached parts by changing the load. Make sure that components run until the
maximum load. These conditions may be due to (but are not limited to) over filling the
air-conditioning system, blocked power steering system or incorrect steering fluid, as well as the
generator failure.

Fault Definition: Sustained High-Frequency Noise

1

Verify the fault. Does the engine hum appear?

2

Dismantle the drive belt, confirm whether the hum sound disappears?

No

To Diagnostic Hints

Yes

No

Replace the failed pulley.

Yes

No

Tighten loose fasteners.

Yes

No

Refer to 2.6.8.3 Replacement of Drive Belt to
replace the drive belt.

Yes

No

Refer to 2.6.8.4 “Replacement of Drive Belt
Tensioner” to remove the drive belt tensioner.

Yes

442