Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
Publisher: Cengage Learning
ISBN: 9781133612315

Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
Publisher: Cengage Learning
ISBN: 9781133612315


Chapter 9, Problem 6ASRQ
Textbook Problem

A vehicle is producing a sharp, metallic rapping sound originating in the upper portion of the engine. It is most noticeable during idle. Technician A diagnoses the problem as piston pin knock Technician B says that the problem is most likely a loose crankshaft thrust bearing. Who is correct?

  1. Technician A

  • Technician B
  • Both A and B
  • Neither A nor B
  • Expert Solution
    To determine

    The exact cause of originating sharp, metallic rapping sound in the upper portion of the engine from the given conditions, basis the given arguments of two Technicians A & B.

    Explanation of Solution


    The noise is more notable when the engine is at idle.

    Technician A says the problem is due to piston pin knocks.

    Technicians B says that the problem is more likely due to crankshaft thrust bearing.

    When there is sharp metallic rape sound coming it is because the piston pin knocks due to worn in piston pin, bearing and also may be due to lack of lubrication...

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