Discovery II (LT) V8-4.6L (2003)
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Stop the engine.
NOTE:
A band where the paint coating has been worn away is normal.
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The band should be the same width as the belt.
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A wear mark wider than the belt may suggest the belt has been "tracking."
2.
Note wear patterns on the belt running surface of the pulleys.
3.
If the wear-band is offset from a central position or if the wear-band on one pulley is offset rearward while the wear-band on another pulley is
offset forwards, inspect for misalignment of one or more of the pulleys.
4.
Verify that the word, "FRONT" is visible on the Active Cornering Enhancement (ACE) and Power Assisted Steering (PAS) pump pulleys as
viewed at the front of the engine.
5.
If "FRONT" is not visible on the outward face of either pulley, remove the pulley and install with the word, "FRONT", visible from the front of
the engine.
NOTE:
The noise is most likely to occur as the belt enters one of the pulleys, but the cause of the noise may be due to a misalignment of any of the
preceding pulleys. If the belt is completely smooth, or particularly if the belt is smoother on one groove face than the other, it is an indication
that there may be a misalignment of one or more pulley.
6.
If not removed for the pulley "FRONT" correction in step 5, remove the drive belt and inspect as follows:
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Check the grooved side of the belt for the presence of a fibrous surface.
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Check the grooves for smoothness and wear patterns.
7.
Check for signs of cracking or excessive dust or grit impregnation.
NOTE:
Excessive coolant contamination may cause swelling of the belt, which may result in noisy operation.
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Check the belt for visual signs or smell of coolant contamination, or of oil contamination.
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Identify and rectify the cause of the coolant or oil spillage or leakage.
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If fluid contamination has occurred, clean the pulleys carefully with water.
7.
Check the attachment torque values for each pulley and all brackets supporting the accessory components.
8.
If torque values are not to the specified value, or bracket misalignment is suspected, remove the component to check for contamination trapped
between the mounting surfaces.
9.
Clean all mounting locations and reinstall the removed component with correct torque values applied.
10.
If any of the following belt conditions has been found, replace the belt with a new component
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If imbedded dirt is found.
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If cracking is found.
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If fluid contamination has occurred.
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If excessive wear has occurred.
11.
If no damage or alignment fault has been found, install a new belt, belt tensioner and idler pulley.
12.
If the noise returns immediately, the cause is more likely to be a damaged accessory device than the drive belt system.
