Shropshire UK ..Telford 01952 247007

Cam timing belts

Online Shop

Buy Automotive components online


Auto Electrical Installation
Products & Services
Vehicle Battery
Starter Motors
Onboard Power
Engine Tuning
Vehicle Security
Towing & Towbar Electrics
Vehicle Wiring
Vehicle Heating & Climate
Diesel Engine Service
Fuel Injectors
Common Rail Diesel Diagnostics
Vehicle Mechanical
Engine Cooling
Cam timing belt
Local breakdown service
Repairs list
Breakdown Assistance
Winter Motoring
Useful links
Vehicle Technology
Automotive Book Store powered by Amazon
Safety Policy
Contact Us



Where is the cambelt located?

The cam belt is usually protected by plastic covers to prevent ingress of foreign objects . It is the drive belt connecting camshaft & crankshaft .

Some people get confused between auxiliary drive belts and cam belts.

What cambelts are made from?
Cambelts are usually made from a rubber based compound to provide flexibility with a cord for strength. Rubber deteriorates over time. The belt can be damaged and its service life shortened by incorrect handling.

Getting the timing right

The Cam timing belt provides synchronisation between engine components . If fitted incorrectly the engine may fail to start or run erratically. In some cases major engine damage may occur.
Cambelt replacement can be a complex job requiring specialist skills and dedicated tools.

What causes the cam belt to fail?

  • Oil & fluid which leaks onto the belt can be injected into the belt as it runs over the pulleys, this can vary the dimensions of the belt and cause the teeth to not mesh with the pulleys.
  • Seizure or collapse of bearings of idler pulleys, pumps etc, can cause the cam belt tension to be lost allowing the belt to jump the teeth on sprockets causing loss of synchronization and usually major damage.
  • Misalignment of pulleys can also cause premature belt failure.
  • How often should the cambelt be replaced?

    Follow the manufacturers recommended service interval for belt replacement. Most manufacturers recommend timing belt replacement between 40,000 and 120,000 miles. The driving cycle and operating environment will also affect replacement frequency.
    Some vehicles may require service item replacement more frequently. Cam timing belts also deteriorate with age. A vehicle covering low annual mileage may require a timing belt change based on schedule.

    How to minimise the chance of cam belt failure

    Check for oil and fluid leaks onto the cam belt. Renew failing oil seals and repair leaks .

    Replace the cambelt using a repair kit not just a belt.

    The repair kit should contain idler bearings and tensioner.  We recommend using a kit from the same manufacturer for best component matching.
    Some vehicles use the cambelt to drive a water pump etc. Check these components for wear and replace if necessary because if the water pump etc fails this could cause the cambelt to break.

    What damage occurs if the cam timing belt fails?

    Cam timing belt failure causes loss of synchronisation between pistons and valvetrain. If the engine is of interference design collision will occur between piston and valves, this may in turn cause potential piston /conrod damage, bent or broken valves, cylinder head damage, camshaft damage, etc.
    Investigation of the damage caused by a broken timing belt almost always requires engine stripdown.

    Vehicle Service History

    If you have just purchased a second hand car and are unsure of the vehicle service history it is wise to have the timing belt renewed as a precaution.
    Many repairers will provide a reminder to customers when their cambelt needs replacing.

    West Mercia Mechanical Services,
    10 Arrow Road,
    Telford.TF5 0LF.
    United Kingdom.
    Telephone: 01952 247007
    Mobile: 07703 558610


    Copyright 2000-2010