One of the most important things to check when buying a used car is whether it has a timing belt or timing chain, and whether it's been maintained properly.
What Does The Timing System Do?
The timing system keeps the engine's valves and pistons moving in perfect sync. If it fails, the engine often destroys itself or causes a hefty repair bill.
Timing Belt
A timing belt is a reinforced rubber belt.
Manufacturers specify replacement intervals based on:
- Mileage
- Age
Many require replacement every 5-10 years or at a certain mileage. Ignoring replacement intervals is one of the biggest risks when buying a used car.
Ideally, you want the car to have proof that the timing belt has been replaced. The difficult thing is if the seller says it's been done but doesn't have an invoice. It's hard to believe without proof, and there isn't really any way of checking without stripping parts of the engine down to inspect the belt.
Timing Chain
Timing chains are designed to last longer, however poor servicing can cause:
- Chain stretch
- Guide wear
- Tensioner failures
I've replaced timing chains on vehicles with less than 40,000 miles due to poor maintenance. Although timing chains don't normally have a replacement interval like timing belts, they still rely on regular servicing and good quality engine oil.
What Buyers Should Ask
When viewing a car, always ask if there's proof the timing belt has been replaced. If the seller doesn't know or can't provide any evidence, budget for replacing it. It's far cheaper to replace a timing belt than it is to replace an engine.
My Honest Opinion
Whenever I'm buying a used car, one of the first questions I ask is about the timing belt or timing chain. It's one of those jobs that people often put off because of the cost, but ignoring it can end up costing thousands. If there's no proof a timing belt has been changed, I'd always factor that into the price of the car and get it replaced for peace of mind.
Alfie has over 11 years of experience in the motor trade and founded Alfa Prestige to give buyers the insider knowledge that was previously only available to professionals.
