Change Car Timing Belt Kit
The timing belt synchronises the crankshaft and the camshafts, opening and closing the valves at the right moment. If it snaps it can destroy the engine in a few milliseconds. It is one of the most critical service jobs on your vehicle.
Why is the timing belt so important?
If it slips or snaps, the crankshaft is no longer synchronised with the camshafts. The pistons strike the valves: bent or broken valves, a damaged cylinder head, scored pistons. A bill running into thousands of pounds, all avoidable with preventive servicing.
When should you change the timing belt?
The interval varies widely from one manufacturer to another: from 60,000 to 240,000 km, or 5 to 10 years. Always check your vehicle's service book.
What the timing belt kit includes
The belt is almost never changed on its own. A full kit includes:
Belt
- £25 to £80 on its own
- Toothed belt in reinforced rubber
Tensioner
- Maintains the correct tension
- Always replace with the belt
Idler pulley
- Guides the belt
- Change at the same time
Water pump
- If driven by the belt
- Replacement essential
The job: what you need to know
Difficulty 4/5
A technically demanding job, needing engine-specific locking tools and a workshop manual. The slightest timing error can destroy the engine.
Timing setup essential
The engine timing points must be set and locked with the manufacturer's tools before removing the belt. Never improvise this step.
Belt tension
A belt that is too slack jumps teeth; too tight, it snaps and damages the bearings. The adjustment depends on the type of tensioner (semi-automatic, automatic or manual).
Kit price
A full kit costs £60 to £200 from a motor factor. Average garage price: around £320, plus 1.5 to 4 hours of labour.
