A rattle from the front of the engine for the first few seconds after a cold start is worth taking seriously. It’s also worth knowing that plenty of drivers searching for a timing chain haven’t got one, which is why the search keeps handing back pages about cambelts. Before anyone quotes you, the first job is working out which of three things is driving your camshafts: a chain, a conventional belt running dry outside the engine, or a belt running inside it in the oil. That answer changes the work, the cost and how long you can reasonably leave it.
A chain runs in oil by design and is meant to last the life of the engine. What wears out is everything holding it tight: the tensioner and the plastic guides. Once there’s slack, the chain slaps against those guides on start-up, before oil pressure has come up and taken the tensioner out, which is exactly why the noise is loudest from cold and fades after a few seconds. Left long enough, the camshaft stops sitting where the crankshaft says it should and the ECU logs a correlation fault.
A conventional belt is a different animal. It runs dry, outside the engine behind a cover, and it’s replaced on mileage or age rather than on noise.
Then there’s the wet belt, which most owners have never heard of until it has cost them an engine. Ford’s 1.0 EcoBoost and the PSA 1.2 PureTech used in Peugeots and Citroens run a cambelt in the oil, inside the engine. As it ages it sheds material, the debris settles in the sump and blocks the oil pickup, and at that point the problem isn’t a belt any more, it’s the engine. If the rattle is coming from a small three-cylinder Ford, Peugeot or Citroen, that’s a likelier explanation than a stretched chain, and catching it early is the difference between a belt job and a new engine.
Where it genuinely is a chain, the warning tends to arrive as noise and misbehaviour rather than a light:
None of that is proof on its own. A cam sensor, its wiring, an oil pressure fault or a fuelling problem can produce much the same picture, and a tensioner can let go with very little notice at all. The honest version is that a rattle nobody ever looked into is the warning most people had.
Our engine diagnostic is £69. On this fault it buys stored and pending codes, the freeze-frame data captured when the fault set, live data with the cam and crank signals watched against each other to see whether they still agree, and a listen to the engine properly cold rather than after it’s been idling in a car park. That’s evidence the chain has stretched or the belt has moved, instead of a guess from a noise. It’s usually credited against the repair when the work is booked in with us, but that’s job dependent and not automatic on smaller jobs. It’s decided case by case and made clear before you commit to anything. Most diagnostics are same-day. Deeper fault finding isn’t, because a fault that only appears under load or after a few miles has to be driven to be found, and road testing can’t be rushed into a slot.
Nothing begins without your approval. Once the diagnosis is done you get the figure and what it covers, and if you want time to think, the car sits untouched. When the work’s finished the timing is verified, the codes are cleared and then rechecked to make sure they stay clear, and the car goes out on the road before it comes back to you. You’ll also be told in plain words what the noise actually was, because after paying for timing work most people want to know.
Almost none of the cost is the chain itself. It’s the labour to reach it, and that varies enormously between engines. On some the front of the engine is open enough to work in situ; on others the ancillaries, the engine mount and the lower cover all have to come off before anyone can see the timing drive, and that’s before the sump is disturbed.
With it all apart, the guides and tensioner are the parts that wore in the first place, so replacing them alongside the chain is usually the sensible call rather than paying the same labour again in a year. The one thing that changes the job completely is a chain that has already jumped a tooth, because the valves and pistons may have met. That’s a cylinder head job, not a timing job, and it’s one of the things the diagnosis is there to find out before you commit.
We don’t publish a chain price, because the figures that drive it are the ones listed above and they’re not known until the car has been looked at. What we can tell you before you spend anything is that the diagnostic is £69, and that if the car turns out to be a wet belt engine, wet belt replacement starts from £599+VAT. Everything else is quoted after diagnosis, with honest, upfront pricing and no hidden extras, and nothing starts without your approval.
Sometimes the answer is that the job costs more than the car is worth. Being told not to spend the money is a legitimate outcome, not a wasted appointment, and where an owner decides not to repair, our sister business We Buy Broken Fords is the straight alternative. We’d rather say it than quote you for work that doesn’t make sense.
Timing drive work is what comes through these doors week in, week out: wet belts, chains, guides, tensioners, components starved of oil, and engines opened up to find out why they wore early rather than simply to put new parts in. Most of that workload is Ford, Peugeot and Citroen, and the reason is the shared design of the 1.0 EcoBoost and the 1.2 PureTech rather than any limit on what we take in. All makes and models are welcome, petrol, diesel, hybrid and electric, including older cars a main dealer would rather not have on the ramp. Parts come from suppliers like GSF and Euro Car Parts, chosen for the vehicle rather than for the invoice.
We won’t pretend to be local to you. The workshop is a single unit on the Medway City Estate in Rochester, just off the A289, and Swanley is a fair way west of the towns we usually see. Some drivers make the run themselves: the A20 down to the M25 at junction three, round onto the A2 and east past Gravesend to Strood, then the A289 onto the estate.
If the car won’t start, is stuck in limp mode or has been sitting for months, we own our recovery truck rather than booking an agency, so bringing a dead car in is ordinary work here rather than a favour. A chain that has jumped is exactly that sort of car. Tell us where it’s parked when you get in touch and we’ll confirm the collection before anything is booked.
Phone: 01634 510 780
Email: bookings@medwayvehicleservices.
co.uk
Unit 3 Cliffe Yard, Anthonys Way, Medway City Estate, Rochester, Kent, ME2 4DY
