Ford B-Max Timing Belt: Intervals, Fitment & Warning Signs

The B-Max's 1.0 EcoBoost uses an oil-submerged "wet belt" with a well-documented premature failure risk — here's the interval that actually protects it, regardless of Ford's official schedule.

Illustration for editorial purposes

OEM Part Number: 1787857

Confirmed: The 1.0 EcoBoost's "Wet Belt" Is the Single Most Important Thing to Check Here — Ford B-Max Timing Belt

If your B-Max is fitted with the 1.0-litre EcoBoost engine — one of the most common engines across the Ford range from 2012 onwards — this is genuinely the most important thing to understand before anything else on this page. Unlike a conventional dry timing belt or chain, this engine's belt runs submerged in engine oil, a design intended to reduce friction and noise. It's also developed a well-documented reputation for premature degradation, particularly on cars used mostly for short journeys or with inconsistent servicing — a failed belt can shed rubber material into the oil system, block the oil pickup, and cause complete engine failure. Repair bills of several thousand pounds are genuinely common when this goes wrong.

Ford revised the engine from around 2019 onwards on some variants, moving toward a more conventional chain-driven design — if you're looking at a newer B-Max specifically, confirming which version your exact engine uses via your VIN is worth doing rather than assuming either way.

Other B-Max Engines: What They Actually Use

Naturally-aspirated petrol and diesel variants use more conventional timing arrangements without the wet-belt design's specific risk profile — if your B-Max doesn't have the 1.0 EcoBoost badge, the wet belt considerations above don't apply, though the general belt/chain fitment principles below still do.

A Related, Serious Issue Worth Knowing: The Oil Pump Drive Belt

Distinct from the timing belt itself, but directly connected to it: manual-transmission B-Max models with the 1.0 EcoBoost have been the subject of an NHTSA investigation after complaints describing wet-belt material fragments accumulating inside the internal oil pump's pickup screen, causing sudden loss of engine oil pressure and a loss of power while driving. This hasn't resulted in a formal UK recall at time of writing in the way the automatic Focus and EcoSport have seen, but the underlying mechanism is identical to the wet belt degradation already discussed above — one more reason to take the belt replacement guidance seriously regardless of which specific fault ultimately develops from a neglected belt.

Ford B-Max Timing Belt: Generations & Engines: Belt or Chain

Watch: Replacing the Wet Belt

This covers the 1.0 EcoBoost wet belt design. Diesel engines follow a different, conventional dry-belt procedure — confirm your exact engine before starting.

Ford B-Max Timing Belt: Generations & Engines: Belt or Chain

Watch: Replacing the Wet Belt

This covers the 1.0 EcoBoost wet belt design shared across the Ford range. Diesel and larger petrol engines are different jobs entirely — check which your car has above.

Ford B-Max Timing Belt: Warning Signs, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Timing Belt Guide for symptoms to watch for, confirming fitment against your VIN, and which aftermarket brands are worth trusting.

More Ford Timing Belt

The same part, covered across other Ford models.

• Ford C-Max Timing Belt
• Ford EcoSport Timing Belt
• Ford Fiesta Timing Belt
• Ford Focus Mk3 Timing Belt
• Ford Galaxy Timing Belt
• Ford Ka+ Timing Belt
• Ford Kuga Timing Belt
• Ford Mondeo Timing Belt
• Ford Puma Timing Belt
• Ford S-Max Timing Belt