Econoline E550 V8-7.3L DSL Turbo VIN F (2002)
Drive Belt: Component Tests and General Diagnostics
Belt Tensioner
Drive Belt Tensioner-Automatic
NOTE: Drive belt tension is not adjustable. The drive belt tensioner automatically adjusts drive belt tension.
CAUTION: The drive belt tensioner has no provision for adjustment and will be damaged if forced to travel beyond its operating range.
Check the automatic drive belt tensioner:
1. With the engine off, check for correct drive belt routing. Repair as necessary.
2. Rotate the drive belt tensioner and check for a binding or frozen condition. Install new components as necessary.
Drive Belt Misalignment
Drive Belt Misalignment
CAUTION: Incorrect drive belt installation will cause excessive drive belt wear and can cause the drive belt to come off the cave pulleys.
Non-standard Dive belts can track differently or incorrectly. If a new drive belt tracks incorrectly, install a new original equipment drive belt to avoid
performance failure or loss of belt.
With the engine running, check the drive belt tracking If the (A) edge of the drive belt rides beyond the edge of the pulleys, noise and premature wear
can occur. Make sure the (B) drive belt rides correctly on the pulley. If a drive belt tracking condition exists, follow the procedures below:
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Visually check the drive belt tensioner for damage, especially the mounting pad surface. If the drive belt tensioner is not installed correctly with
the dowels in the mounting bracket holes (4.2L only), the mounting surface pad will be out of position. This will result in chirp and squeal noises.
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With the engine running, visually observe the front surface grooves in the pulleys (not the pulley flanges) for excessive wobble. Install new
components as necessary.
Check all accessories, mounting brackets and the drive belt tensioner for any interference preventing the component from mounting correctly. Correct
any interference condition and recheck the belt tracking.
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Tighten all accessories, generator mounting brace and drive belt tensioner retaining hardware to specification. Recheck the drive belt tracking.
Drive Belt Noise/Flutter
Drive Belt Noise
Drive belt chirp occurs due to pulley misalignment or excessive pulley runout. It can be the result of a damaged pulley or an incorrectly aligned pulley.
To correct, determine the area the noise comes from. Check each of the pulleys in that area with a straightedge to the crankshaft pulley. Look for
accessory pulleys out of position in the fore/aft direction or at an angle to the straightedge.
Drive belt squeal is an intermittent noise that occurs when the drive belt slips on a pulley during certain conditions, such as engine start-up, rapid
engine acceleration or A/C clutch engagement.
Drive belt squeal can occur under the following conditions:
1. The A/C discharge pressure goes above specifications, causing one of the following:
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The A/C system is overcharged.
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The A/C condenser core airflow is blocked.
2. The A/C OFF equalized pressure (the common discharge and suction pressure that occurs after several minutes) exceeds specifications.
3. Any of the accessories are damaged or have a worn or damaged bearing or internal torsional resistance above normal. All accessories must be
rotatable by hand in the unloaded condition. If not, inspect the accessory.
4. Fluid gets on the drive belt. This includes power steering fluid, engine coolant, engine oil or air conditioning system lubricant. If fluid gets on the
drive belt during repairs, clean the drive belt with soap and water, and thoroughly rinse with clean water. A new drive belt does not have to be
