Of all the parts in your motorhome's engine, there's one whose maintenance you should never neglect, because its failure is one of the most expensive and catastrophic: the timing belt. And in a camper it has a particular trap, because doing few kilometres makes it easy to overlook. Here we explain what it is, why it matters so much and when to change it. (This isn't mechanical advice; always follow your manufacturer's schedule and your workshop's guidance.)
What it is and why it's so important
The timing belt is the part that synchronises the engine (coordinating the parts that must move in step with each other). If it breaks while the engine is running, those parts collide with each other and can destroy the engine internally, turning a relatively cheap part into an extremely expensive repair (sometimes, a new engine). That's why its preventive replacement is sacred.
The camper trap: it expires by TIME
This is the crucial point. The timing belt should be changed by mileage OR by time, whichever comes first. The belt material ages with the years even if you barely drive. And since a motorhome usually covers few kilometres a year, it's very easy to reach the time limit long before the mileage limit. The typical mistake: "it's only done 60,000 km, it's still got plenty left"... but if it's 7 or 8 years old, it may need changing regardless due to time. Don't go by mileage alone.
When to change it
- Follow the manufacturer's schedule: each engine has its own interval in km and years. [Note: check your engine's timing belt replacement interval, both by mileage and by time.]
- Whichever comes first: if you reach the years before the mileage (usual in a camper), change it anyway.
- Take the opportunity to change what's around it: it's usually replaced together with the water pump, tensioners and rollers, since access is already open.
- If buying second-hand: ask and check when it was last changed; if there's no record, treat it as outstanding (see buying second-hand).
Note: some engines have a chain
Watch out: not all engines have a belt; some have a timing chain, which in principle lasts longer (though it still needs attention). Check which one yours has and its maintenance needs.
In summary
The timing belt synchronises the engine and its failure can destroy it, and in a low-mileage camper it expires by time before mileage, so don't go by mileage alone. The step to take today: check when your camper's belt was last changed and what your engine's interval is by years; if you've reached the time limit even without the mileage, schedule it now (and take the chance to do the water pump too). Combine it with oil and servicing.