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 

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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 

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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 

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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 

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