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Question

Difficulty: EasyEngine Compartment Inspection

During a pre-trip inspection of the engine compartment, what is the maximum acceptable deflection or play when checking the tension at the center of a drive belt?

  1. A
    Up to 2 inches
  2. Up to 3/4 inchAnswer
  3. C
    Up to 4/32 inch
  4. D
    Up to 1 inch of pushrod stroke

Answer

Up to 3/4 inch
Under standard CDL vehicle inspection rules, checking drive belts requires ensuring they are not cracked, frayed, or worn, and that they deflect no more than 3/4 inch (or 1/2 to 3/4 inch) when pressed firmly at the center point between pulleys.

Step-by-Step Solution

1
Identify the component being inspected in the engine compartment
Engine drive belts (such as alternator, water pump, or power steering belts).
Different engine compartment components have distinct safety inspection criteria and physical tolerances.
2
Apply standard CDL pre-trip inspection tolerances for belt deflection
Belts should be snug and deflect no more than 1/2 to 3/4 inch at the center of the span.
Excessive belt play causes slippage, leading to overheating, battery charging failure, or loss of power steering assist.

Key Concept

Drive Belt Tension and Deflection Tolerance
Estimated Time:45s
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Topics

Engine Compartment Inspection

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