It is difficult to overestimate the importance of the timing kit (timing mechanism) in the engine design. Whether the engine will function smoothly, stably and without the risk of costly breakdowns directly depends on its proper operation. The slightest malfunction of the timing system can lead to an overhaul of the internal combustion engine. This means that timely replacement of the timing kit and its correct choice are the basic rules of car care.
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What is included in the timing kit?
Different elements may be included as standard, depending on the engine design and brand.:
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Timing belt — connects the crankshaft and camshaft, synchronizing their operation;
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Tension roller — holds the belt in the required tension;
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Bypass roller (or several) — ensures the correct movement of the belt along the trajectory;
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Pump (water pump) — responsible for the circulation of coolant, sometimes driven by the same belt;
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Mounting bolts and studs are often included in quality kits.;
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Instructions, stickers, and phase caps are useful additions from reputable manufacturers.
It is important to understand that if the engine manufacturer constructively uses a pump in the timing drive, it must always be replaced along with the belt and rollers, otherwise the risks of overheating and repeated repairs are too high.
Why is it important to change the entire set, rather than individual parts?
The life of the belt, rollers and pump is similar — and their wear occurs simultaneously. Replacing only the belt with old casters is like putting a new chain on worn—out bicycle sprockets. Such repairs are short—lived, and the consequences are serious.:
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A belt break can cause the valves to hit the pistons and damage the cylinder head.;
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Jamming of the roller can cause cutting of the teeth;
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Failure of the pump will cause the engine to overheat and the seals to collapse.
Therefore, always change the entire kit, especially if you have already opened the timing cover and got to all the elements.
When should I change the timing kit?
The replacement time directly depends on the car brand, engine type, driving style and operating conditions. On average, the recommended interval is as follows:
However, there are situations in which replacement is necessary earlier.:
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Oil stains on the belt;
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The noise from the rollers;
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The engine is not pulling or tripping;
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There is no information about the replacement when buying a used car.
Advice:
