Service manual

Engine Engine Electrical 6-19
2006 LSSV Service Manual Supplement
24V Generator Noise Diagnosis (cont’d)
Step Action Yes No
2
1. Start the engine. Verify that the noise can be heard.
2. Turn OFF the engine.
3. Disconnect the 4-way connector from the generator.
4. Start the engine.
5. Listen for the noise.
Has the noise stopped?
Go to Step 10 Go to Step 3
3
1. Turn OFF the engine.
2. Remove the drive belt. Refer to Drive Belt
Replacement in Engine Mechanical 6.6 L in 2006 C/K
Truck Service Manual.
3. Spin the generator pulley by hand.
Does the generator shaft spin smoothly and without any
roughness or grinding noise?
Go to Step 4 Go to Step 10
4
Inspect the generator for a loose pulley and/or pulley nut.
Is the generator pulley or pulley nut loose? Go to Step 11 Go to Step 5
5
1. Loosen all of the generator mounting bolts.
2. Tighten the generator mounting bolts to specifications
and in the proper sequence if necessary. Refer to 24V
Generator Replacement.
3. Install the drive belt. Refer to Drive Belt Replacement
in Engine Mechanical – 6.6L in 2006 C/K Truck Service
Manual.
4. Start the engine.
Has the noise decreased or stopped?
System OK Go to Step 6
6
Inspect the generator for the following conditions:
• Strained or stretched electrical connections.
• Hoses or other vehicle equipment resting on the
generator, which may cause the noise to be transmitted
into the passenger compartment.
Are any electrical connections pulling on the generator or are
any hoses, etc. resting on the generator?
Go to Step 7 Go to Step 8
7
1. Reroute the electrical connections to relieve the
tension.
2. Reroute the hoses, etc. away from the generator.
3. Start the engine.
Has the noise decreased or stopped? System OK Go to Step 8
8
Inspect the drive belt for proper tension. Refer to Drive Belt
Tensioner Diagnosis in Engine Mechanical 6.6 L in 2006 C/K
Truck Service Manual.
Is the drive belt loose? Go to Step 9 Go to Step 10