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Dayco – Timing Belt Diagnostics

Timing Belt: Clean break

Causes:

  • Incorrect handling during installation
  • Use of inappropriate tools during installation

Actions:

  • During the installation operations, do not twist or bend the belt excessively
  • During assembly, do not use inappropriate tools or levers to fit the belt on the pulleys; if there are flanges on the pulleys, do not force the belt and fully loosen the tensioner to guarantee minimum amplitude of the belt
  • Replace the faulty belt

Timing Belt: Loose teeth

Causes:

  • Low working tension of the belt
  • Loss of tension in the belt
  • Penetration of foreign matters in the transmission

Actions:

  • Check the belt tension and tension it correctly
  • Check the integrity and correct fastening of the tensioner and other transmission components
  • Replace the faulty belt

Timing Belt: Worn land area

Causes:

  • Excessive tension
  • Worn pulleys

Actions:

  • Replace the worn rigid component
  • Replace the belt and reset the correct working tension
  • Replace the faulty belt

Timing Belt: Worn teeth

Causes:

  • Irregular tension
  • Pulleys with worn teeth
  • Belt tooth profile not compatible with the pulley notches

Actions:

  • Reset the correct belt tension
  • Replace the worn rigid component
  • Check compatibility between the belt tooth profile and the pulley notches
  • Replace the faulty belt

Timing Belt: Tooth swelling

Causes:

  • Contamination by solvents, lubricants or coolant

Actions:

  • Handle with clean hands as much as possible
  • Remove any contaminant leakage from the engine
  • Replace the faulty belt

Timing Belt: Ragged break

Causes:

  • Penetration of foreign matter in the transmission
  • Locking of a transmission component
  • Excessive assembly tension
  • Contact with fuel, petroleum derivatives or solvents

Actions:

  • Check the correct fastening of the transmission components and protective case, and its integrity
  • Check the wear condition of the components and verify their correct operation
  • Tension the belt correctly
  • Replace the faulty belt

Timing Belt: Side wear

Causes:

  • Misalignment of the tensioner or one of the transmission components

Actions:

  • Check the integrity and correct fastening of the tensioner and other transmission components and reset the alignment if necessary
  • Replace the tensioner and/or pulley if worn
  • Replace the faulty belt

Timing Belt: Irregular Wear on Belt Back

Causes:

  • Locking of a transmission component
  • Worn pulleys

Actions:

  • Replace the worn rigid component
  • Replace the belt and reset the correct working tension
  • Replace the faulty belt

Timing Belt: Cracks on the belt back

Causes:

  • Operation at excessively high or low temperatures

Actions:

  • Check the working environment temperature and use belts produced with heat-resistant compounds
  • Replace the faulty belt

Written by:

Published on: February 6, 2017

Filled Under: Engine, Technical Articles, Timing Belt

Web site: http://www.dayco.com

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