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A cambelt or timing belt is one of the most important parts of a car's engine. It's responsible for keeping crucial parts of the motor working in sync with each other - making sure timing is accurate to ensure perfect running.

A snapped cambelt or timing belt can cause the pistons and valves of the engine to collide, resulting in severe and irreversible engine damage, meaning an engine rebuild or completely new engine is needed - both of which are not cheap.

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When buying a new car it's worth finding out when the belt is needing to be changed, if at all, but it's especially important with a used car for obvious reasons.

Cambelts or timing belts usually need to be replaced, usually between 40,000 and 100,000 miles. Alternatively, for lower mileage cars, the belt is advised to be replaced around four or five years. However, it all depends on the car and manufacturer.

Some cars have a timing chain instead of a belt. A chain is normally made of metal links rather than rubber or polyurethane, which is what most belts are made of. Chains tend to more durable and normally last longer than a belt, but that's not to say some can fail. Timing chains tend to last the life of the car, whereas as many cars with a timing belt require it to be changed as part of the car's servicing requirements.

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Is your car running rough? Maybe you've noticed a lack of power, or just want to check the condition of your timing belt, chain or cambelt. Contact your local Evans Halshaw who can book your car in for a diagnostics.

[Remark]Regarding deep groove ball bearings and matched pair and double-row angular contact ball bearings, equations of the relationship between radial internal clearance and axial internal clearance are shown on page A 111.

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Poor timing on an engine, resulting from a worn or faulty cambelt can cause a number of problems with the biggest being engine damage, which in most cases is not a cheap fix.

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Table 10-1 shows how to determine the operating clearance when the shaft and housing are made of steel. 『Table 10-1 How to determine operating clearance』 Tables 10-2 to 10-10 show standard values for bearing internal clearance before mounting. 『Table 10-2 Radial internal clearance of deep groove ball bearings (cylindrical bore)』 『Table 10-3 Radial internal clearance of extra-small/miniature ball bearings』 『Table 10-4 Axial internal clearance of matched pair angular contact ball bearings (measurement clearance)』 『Table 10-5 Radial internal clearance of double-row angular contact ball bearings』 『Table 10-6 Radial internal clearance of self-aligning ball bearings』 『Table 10-7 Radial internal clearance of electric motor bearings』 『Table 10-8 Radial internal clearance of cylindrical roller bearings and machined ring needle roller bearings』 『Table 10-9 Radial internal clearance of spherical roller bearings』 『Table 10-10 Radial internal clearance of double/four-row and matched pair tapered roller bearings (cylindrical bore)』 Table 10-11 shows examples of clearance selection excluding CN clearance. 『Table 10-11 Examples of non-standard clearance selection』

（Extra-small ball bearing9 mm or larger in outside diameter and under 10 mm in bore diameter） （Miniature ball bearingunder 9 mm in outside diameter）

Most cambelt servicing requirements are conveniently listed in the car's handbook or can be found via a quick browse of the internet.

If a cambelt or timing belt interval is missed, or the aforementioned points above are ignored, the outcome can be that of serious engine damage.

The cambelt or timing belt is crucial to an engine as it's responsible for keeping the motor working as smoothly as possible, making sure the timing is accurate - hence why it's sometimes called a timing belt.

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[Note]"Interchangeability" means interchangeable only among products (sub-units) of the same manufacturer ; not with others.

If your car or a vehicle you're looking to buy is suffering from any of the below, it could be a sign that the timing is off - usually meaning the cambelt or timing belt needs adjusting or changing: