![]() ![]() In a four-stroke engine the valves are only required to remain open for two of the strokes – intake or exhaust. Not only does the belt take torque from the crankshaft to drive the camshaft(s), it does so in a precisely timed way – turning the camshaft(s) at exactly half the rotational speed of the crankshaft. One pen is the crankshaft, which supplies power (actually rotating energy or torque) and the other pen is the camshaft, which opens and closes valves in the engine to release exhaust gases or draw air into the combustion chambers. Turn one pen and the rubber band will turn the other pen, if you're holding the pen loosely enough. Take a rubber band and hold it stretched between two pens in parallel. The service adviser will most likely volunteer the information when the part is due for renewal anyway. If in doubt, check with the service adviser at the local dealer or after-market workshop. Other than exceptional circumstances like that, the car's service manual outlines how frequently the belt should be replaced. After a number of unexpected breakages, Holden recommended replacement at 60,000km intervals, rather than the original interval of 120,000km, for its TS-series Astra from 1998. Manufacturers usually recommend an interval of around 100,000km or roughly five years on average for the replacement of the timing belt. At the very least the mechanic servicing the vehicle should inspect it for wear and tear. While you can let the spark plugs last until the next service (perhaps) or put off replacing that air filter – not that either of those choices is recommended – replacement of the timing belt when it's due is critical. There is a host of mechanical components in need of repair or replacement when some parts stop rotating, but other parts don't. It is (almost literally) a spanner in the works.Ī broken belt will leave a motorist stranded by the side of the road, with only one way to get the car home or to a workshop: on the back of a tray truck.Īnd the damage done can cost a small fortune to fix. Having a timing belt break can ruin your day.
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