Belt - Inspect; Belt Tensioner - Check - Perkins 904D-E28T Operation And Maintenance Manual

78
Maintenance Section

Belt - Inspect

4. Clean all disconnected connection and battery
terminals.
5. Use a fine grade of sandpaper to clean the
terminals and the cable clamps. Clean the items
until the surfaces are bright or shiny. DO NOT
remove material excessively. Excessive removal
of material can cause the clamps to fit incorrectly.
Coat the clamps and the terminals with a suitable
silicone lubricant or petroleum jelly.
6. Tape the cable connections to help prevent
accidental starting.
7. Proceed with necessary system repairs.
8. When connecting the battery, connect the positive
connection before the negative connector.
Belt - Inspect
Illustration 35
Typical example
To maximize the engine performance, inspect the
belt (1) for wear and for cracking. Replace the belt if
the belt is worn or damaged.
• Inspect the belt for cracks, splits, glazing, grease,
displacement of the cord and evidence of fluid
contamination.
The belt must be replaced if the following conditions
are present.
• The belt has a crack in more than one rib.
• More than one section of the belt is displaced in
one rib of a maximum length of 50.8 mm (2 inch).
To replace the belt, refer to Disassembly and
Assembly, "Alternator Belt - Remove and Install". If
necessary, replace the belt tensioner. Refer to
Disassembly and Assembly, "Alternator Belt -
Remove and Install" for the correct procedure.

Belt Tensioner - Check

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Illustration 36
Typical example
1. Remove the belt. Refer to Disassembly and
Assembly, "Alternator Belt - Remove and Install".
2. Ensure that the belt tensioner (2) is securely
installed. Visually inspect the belt tensioner for
damage. Check that the pulley on the tensioner
rotates freely and that the bearing is not loose.
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3. Some engines have an idler pulley (2). Ensure that
the idler pulley is securely installed. Visually
inspect the idler pulley for damage. Ensure that
the idler pulley can rotate freely and that the
bearing is not loose.
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