Part explained
Timing belt replacement: interval, cost and risk
The timing belt keeps the top and bottom of your engine in sync. If it snaps on an interference engine, valves and pistons collide — usually total engine loss. So this is one of the few parts you replace on interval, before symptoms appear. This page explains when, what it costs, and why the water pump usually goes with it.
By the onderdelen.autos editorial team · Updated
What does the timing belt do?
The timing belt (or chain, on some engines) drives the camshaft from the crankshaft, controlling exactly when valves open and close relative to the pistons. A new belt has a fibre-reinforced rubber jacket; older rubber turns brittle, cracks, or jumps a tooth. On most engines the water pump is driven by the same belt, so it goes on the same service interval.
Symptoms — but don't rely on them
- Ticking or rattling from the timing cover (rare — often no warning at all).
- Oil seepage around the timing cover or camshaft seal.
- Poor cold-start behaviour or misfires (belt has shifted a tooth).
- A "timing correlation" or similar cam-position fault code.
When to replace
The manufacturer specifies an interval, typically 60,000 to 120,000 km or 5 to 10 years — whichever comes first. The exact figure is in the owner's manual or service history. When in doubt: replace. The cost of a planned change is a fraction of the cost of a snapped belt. Chains theoretically don't have a fixed interval but stretch or rattle after 150,000 km and become workshop work anyway.
Typical interval: 60,000–120,000 km
What does the kit cost?
A complete timing kit (belt + idler + tensioner) runs € 60 – € 180 depending on brand and engine. The water pump, where driven by the same belt, is fifteen minutes of extra work — never skip it; replacing it a year later costs nearly the same in labour as the entire kit does now. Workshop labour: 4 – 8 hours.
| Condition | From | To |
|---|---|---|
| New | € 35 | € 180 |
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DIY?
Difficulty: Hard
Timing work is workshop work. One tooth off on the cam pulley and the engine either runs badly or grenades. Without engine-specific lock tools and experience: send it out. A common middle path: order the kit yourself, supply it to an independent garage, pay only labour.
- Engine-specific timing lock tools
- A torque wrench with wide range
- A crank pulley or harmonic balancer holder
- Time and a clean workspace (4 – 8 hours)
Frequently asked questions
How do I know when my timing belt is due?
The exact interval is in the owner's manual and service history. Indicative: 60,000 – 120,000 km or 5 – 10 years, whichever comes first.
Should the water pump always be replaced too?
On most engines where the pump is driven by the timing belt: yes. Otherwise the labour bill doubles within 30,000 km.
What is the difference between a timing belt and a timing chain?
A belt is rubber-with-fibre and has a fixed interval. A chain is metal and theoretically lasts the life of the engine, but stretches or rattles past 150,000 km and needs replacement then.
What does a snapped belt cost in engine damage?
On an interference engine: bent valves, damaged pistons. Budget € 1,500 – € 4,000, or total loss depending on the engine.
Can I buy a used timing kit?
Not recommended — most sellers only offer new kits. A used kit has already lived part of its life and the savings are small. A used water pump from the same engine block is, however, a common option.
Related parts
Timing kits from Dutch inventory
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