Timing Belts
in Wing, Leighton Buzzard
Why is the timing belt important?
The timing belt is one of the most critical components in a vehicle’s engine. It ensures that the camshaft and crankshaft rotate in synchronisation, allowing the engine’s valves to open and close at the correct times. This is critical for proper engine performance, and also helps to prevent engine damage.
If the timing belt fails, the consequences can be very costly. In many engines, a broken timing belt can cause the pistons to hit the valves, leading to bent valves, and possibly even damaged pistons.
In a lot of cases, this results in the vehicle requiring a completely new engine. Even in older style vehicles and classics, a snapped timing belt will stop the engine from running, leaving you stranded.
The timing belt also drives other components on some vehicles, such as the water pump, and high pressure fuel pump.
Therefore, the failure of the timing belt has consequences for multiple other systems. Because of how crucial the timing belt is, regular inspection and early replacement are essential for protecting your vehicle’s engine and avoiding expensive repairs.
Do all vehicles have the same timing belt?
No, timing belts vary depending on the engine type, make, and model of the vehicle. Some engines use a timing chain instead of a belt, which is generally more durable, and often lasts the life of the engine, although it may still require inspection, especially as a result of extended service schedules. Timing belts differ in length, tooth design, width, and replacement timing.
Even vehicles from the same manufacturer can have different timing belt requirements depending on engine size.
Because of these differences, it’s essential to follow your vehicle manufacturer’s recommendations for inspection and replacement. Using the wrong belt or neglecting maintenance can result in engine damage and costly repairs.
How often should a timing belt be replaced?
Timing belt replacement intervals vary by make and model, but typically range anywhere from 60,000 to 100,000 miles, or roughly 5-10 years. Some vehicles have longer intervals, but it is recommended to stick to manufacturer recommended intervals. In some cases, timing belt replacement may be carried out earlier than manufacturer recommendations due to early failure cases. We have seen cases of this with the increased VW intervals, which causes the idlers to fail before the belts.
Even if a car is not driven regularly, the timing belt can degrade over time. Cracks or worn teeth can develop silently without any change in vehicle performance, so adhering to the manufacturer’s time-based recommendation is important, regardless of the mileage completed.
During timing belt replacement, we also replace any other pulleys, water pumps, and bolts, to make sure that the whole system has been renewed. If the water pump has been changed, then the vehicle will also have a coolant renewal completed at the same time.
Frequently asked questions
Can a timing belt break without warning?
Yes, timing belts are under constant stress, and wear can develop without any signs of failure. While some belts show warning signs, others can fail suddenly without any warning at all. A broken timing belt will cause the engine to stop immediately, and will cause damage to other systems.
How do I know if my timing belt is worn?
Timing belts are often hidden behind covers, making them difficult to inspect visually. Some engines may produce unusual noises, such as a ticking or rattling sound, if the belt is loose or worn. Therefore, it is important to act on this immediately before the timing belt fails. A lot of the time, there will be no warning signs at all.
Because failure is dangerous, the safest approach is to replace the timing belt at the recommended manufacturer interval.
How long does a timing belt replacement take?
Replacing a timing belt is a labour-intensive job that typically takes 2 to 12 hours, depending on the type of engine. Timing belt replacements take a long time due to the number of components that have to be removed to access the belt. Some engines that have wet belts may take more than a day to complete, depending on what other components also need replacing.
While it can take longer than standard servicing, replacement is much cheaper than repairing the engine after a timing belt failure.
Can the water pump be replaced at the same time?
Yes. The water pump is commonly driven by the timing belt or located in the same area, making it convenient to replace both at the same time. If the water pump is not run by the timing belt, and requires additional time, this will be reflected in the estimate. Replacing a water pump generally has the same recommended replacement interval as the timing belt, so they are typically done at the same time.
Can the timing belt last longer if the car is rarely driven?
This is not always the case. Even if a car is not driven often, the rubber in a timing belt can degrade over time. Manufacturer recommendations for replacement often include both mileage and time intervals. Neglecting the timing belt because the car is idle can still lead to cracks and failure.
Can a worn timing belt cause engine damage?
Yes, a worn or broken timing belt can cause serious engine damage. If the belt snaps, pistons can collide with open valves, bending or breaking them, and potentially damaging other internal components.This will most likely lead to a top end engine rebuild being the best case scenario, but the vehicle may require a completely new engine.