
Engine
Marine/Industrial 4.3L 6-23
2000 Marine/Industrial
7
Install a new drive belt. Refer to
Drive Belt Replacement.
Did you complete the replacement?
—
Go to Step 8
—
8
Operate the system in order to verify the repair.
Go to
Did you correct the condition?
—
System OK
Diagnostic Aids
Drive Belt Rumbling Diagnosis (cont’d)
Step
Action
Value(s)
Yes
No
Drive Belt Vibration Diagnosis
Diagnostic Aids
The accessory drive components can have an affect
on engine vibration. Such as, but not limited to the
A/C system overcharged, the power steering system
restricted or the incorrect fluid or an extra load on the
generator. To help identify an intermittent or an
improper condition, vary the loads on the accessory
drive components.
Test Description
The number(s) below refer to the step number(s) on
the diagnostic table.
2. This test is to verify that the symptom is present
during diagnosing. Other vehicle components
may cause a similar symptom such as the
exhaust system or the drivetrain.
3. This test is to verify that the drive belt(s) or
accessory drive components may be causing
the vibration. When removing the drive belt the
water pump may not be operating and the
engine may overheat. Also, DTC’s may set
when the engine is operating with the drive belt
removed.
4. The drive belt(s) may cause a vibration. While the
drive belt(s) is removed, inspect the condition of
the belt.
6. Inspecting of the fasteners can eliminate the
possibility that a wrong bolt, nut, spacer or
washer was installed.
8. This step should only be performed if the fan is
driven by the drive belt. Inspect the engine
cooling fan for bent, twisted, loose or cracked
blades. Inspect the fan clutch for smoothness,
ease of turning. Inspect for a bent fan shaft or
bent mounting flange.
9. This step should only be performed if the water
pump is driven by the drive belt. Inspect the water
pump shaft for being bent. Also inpsect the water
pump bearings for smoothness and excessive
play. Compare the water pump with a known good
water pump.
10. Accessory drive component brackets that are
bent, cracked or loose may put extra strain on
that accessory component causing it to vibrate.
Notice: Refer to Belt Dressing Notice in Cautions and Notices.
DEFINITION:
•
The vibration is engine-speed related.
•
The vibration may be sensitive to accessory load.
1
Did you review the Drive Belt Symptom operation and perform
Go to
Symptoms-
the necessary inspections?
—
Go to Step 2
Drive Belt
2
Verify that the vibration is engine related.
Go to
Does the engine make the vibration?
—
Go to Step 3
Diagnostic Aids
1. Remove the drive belt(s).
Go to
Engine
3
2. Operate the engine for no longer than 30 to 40 seconds.
Related Vibration
Does the rumbling noise still exist?
—
in Vibration and
Diagnosis
Go to Step 4
Inspect the drive belt(s) for wear, damage, debris build-up and
4
missing drive belt ribs.
Did you find any of these conditions?
—
Go to Step 5
Go to Step 6
Drive Belt Vibration Diagnosis
Step
Action
Value(s)
Yes
No
Содержание Powertrain 4.3 L
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