Geely EC718 2009 Workshop Manual page 406

2-324 Engine Mechanical System JL4G18-D
1. Inspect when the engine is cool or has been turned off for 30 min.
2. Visual Inspect whether there is V-drive belt excessive wear or cord wear. If faults are found, replace the V-drive belt.
3. Visual Inspect whether there is drive belt inner or outer damage, wear and cracks. If faults are found, replace the drive belt.
4. If no faults are found in steps 2 and 3, measure the drive belt tension: rotate crankshaft pulley two laps clockwise and measure
whether the tension is even along the drive belt tensioner pulley.
5. Use sound pressure meter (General Maintenance Tools) to measure drive belt tension and frequency at the marked point A.
Drive Belt Tension (N / lb)
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 and replace the drive belt if the measurement is beyond the
scope of the table.
b. If the used drive belt tension is 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.
2.6.7.10 Drive Belt Chirp Sound Diagnostic
Diagnostic Tips:
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 reported fault. If the symptom reoccurs after spraying water, then clean the pulley. Body parts,
suspension parts or other vehicle parts loose or unreasonable installation can also cause the chirp sound.
Fault Definition: The following conditions are the drive belt chirp sound symptoms
– A chirp jack noise can be heard once rotate the drive belt a lap.
– Noise often happens on a rainy day or in a cold morning.
Verify the fault. Does the engine have chirp sound?
Step 1
Yes
Remove the drive belt. Confirm whether the sound disappears?
Step 2
Yes
Check whether the drive belt surface is normal? (Balls and cracks, etc?)
Step 3
EC718/EC718RV EC715/EC715RV 10/2009
New Drive Belt
400-500/89.9-112.4
No
(a) Remove the drive belt. Refer to
Replacement.
(b) Run the engine, but no more than 30 s.
Does chirp sound disappear?
No
Old Drive Belt
300-400/67.4-89.9
To diagnose Tips
2.6.8.3 Drive Belt
Refer to 2.6.7.4 Engine Noise Diagnosis
Engine