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CDL Pre Trip Inspection Engine Compartment

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The following is a list of items that the driver must check during the CDL pre trip inspection engine compartment while the engine is off.

CDL Pre Trip Inspection Engine Compartment (ENGINE OFF)


  • Look for puddles on the ground.
  • Look for dripping fluids on the underside of the engine and transmission.
  • Inspect hoses for condition and leaks.

Oil Level

  • Indicate where the dipstick is located.
  • Make sure the oil level is within safe operating range. The level must be above the refill mark.

Coolant Level

  • Inspect the reservoir sight glass, or If the engine is not hot, remove the radiator cap and check for visible coolant level.

Power Steering Fluid

  • Indicate where the power steering fluid dipstick is located.
  • Check for adequate power steering fluid level. The level must be above the refill mark.

Engine Compartment Belts

Check the following belts for snugness (up to 3/4 inch play at center of belt), cracks, or frays:

  • Power steering belt.
  • Water pump belt.
  • Alternator belt.
  • Air compressor belt.

Note: If any of the components listed above are not belt driven, you must:

  • Make sure the component(s) are operating properly, are not damaged or leaking, and are mounted securely.

Source: 49CFR383.113

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