One of the key factors to consider when owning and caring for a 1999 to 2003 Audi S3 is to ensure that the timing belt is always replaced at or before the recommended service interval. Failure to replace the timing belt can lead to some pretty nasty consequences and expensive repair bills, so keep on top of this.
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Does the Audi S3 8L have a Timing Belt or Chain?
This is pretty obvious from the title of this article, but yes, the 1999 to 2003 Audi S3 has a timing belt and not a chain.
When Does the Timing Belt Need to Be Replaced on a 1999 to 2003 Audi S3
Based on some older Audi service manuals, the recommended service interval for the timing belt on 1.8T engines is set at every 160,000 km (100,000 miles). However, the current consensus suggests that an earlier replacement at around 100,000 km (62,000 miles), is a much better idea. Some owners even go earlier at around 80,000 km (50,000 miles) to be on the safe side.
If your Audi S3 doesn’t get much use, it is generally recommended that you replace the belt every 4 to 5 years.
What Happens if the Timing Belt Breaks on an Audi S3 8L
Unfortunately, the 1.8-liter engine under the hood of the Audi S3 Mk1 is an interference engine. Therefore, if the belt and/or tensioner fails, there is a high risk of the valves colliding with the pistons, resulting in severe engine damage and a rather expensive repair bill.
You can somewhat check the condition of both the belt and tensioner, by listening out for any unusual rubbing, squeaking, tapping, or ticking sounds that seem to be coming from the timing belt area. If you do hear these sorts of noises, it could indicate that the belt and tensioner have exceeded their intended lifespan/failed prematurely. To get a better understanding of the condition of the belt and tensioner, you will need to physically inspect the components.
What Else Should be Replaced with the Timing Belt?
- Tensioners and idler bearings – The components are equally susceptible to failure, and in the event of an issue, they can cause belt failure or misalignment.
- Water pump –Replacing the pump is a good idea as failure can often occur around the 100,000 km (62,000 mile) mark. By replacing the pump during the timing belt service, you can mitigate the risk of potential issues and ensure a more comprehensive maintenance approach.
- Thermostat
- Timing cover gasket and cam chain tensioner gaskets – These components are prone to developing leaks, especially at or beyond the 120,000 km (75,000 mile) mark. While the timing cover gasket is more commonly affected, it is advisable to replace both the timing cover gasket and the chain tensioner gaskets as a preventive measure.
To Sum Up
It is recommended that you replace the timing belt on a Mk1 Audi S3 approximately every 100,000 km (62,000 miles) or before. If this mileage is not reached, the belt should be replaced every 4 to 5 years.
Another thing to keep in mind is that the S3 features an interference engine, so if it breaks serious damage will probably occur.
Lastly, it is recommended that you replace the tensioners and idler bearings, the water pump, thermostat, and the timing cover gasket and cam chain tensioner gaskets while replacing the belt.
