Either you’ve got a rattle for a couple of seconds when the engine starts from cold, or you’ve been handed a quote with four figures on it for a chain, guides and tensioner. In both cases the sensible first move is the same: find out what’s actually making the noise before the front of the engine comes off.
It matters more than it sounds. On the engines we see most weeks, a worn chain and a belt running in oil produce much the same noise from the driver’s seat, and they are not the same repair. A chain job done on a wet belt engine leaves the real fault turning over inside the sump.
A chain doesn’t wear to a schedule. It stretches slowly and its tensioner wears with it, and because the oil drains back overnight there’s nothing holding the slack when you first turn the key. The chain slaps its guides for a few seconds until oil pressure takes it up, which is exactly the cold-start rattle that disappears before you’ve reached the end of the road.
Ford’s 1.0 EcoBoost and PSA’s 1.2 PureTech don’t have a chain at all. They run a cambelt inside the engine, bathed in oil. As it ages it sheds material, the debris settles in the sump and blocks the oil pickup, and once that happens you get an oil pressure warning and, if it keeps running, the engine itself.
So the wrong call is expensive in both directions. Quote a chain kit on a wet belt engine and the customer pays for a repair their car didn’t need while the fault that will finish it is still there. Write off a genuinely worn chain as just a noise and the same thing happens by another route.
Which of those it is decides whether the next step is a chain kit, a wet belt job or something else entirely, and that’s what the diagnostic is for. It’s £69. We read stored and pending fault codes, look at the freeze-frame captured at the moment the fault set, watch live data while the engine runs, and listen to it from properly cold, because a chain fault is loudest in the first few seconds after a start and can be all but silent once everything is warm.
If another garage has already read out timing-related codes, bring the wording with you. A code tells us where to look, not what to replace.
Most diagnostics are same-day. Deeper fault-finding isn’t, and we’d rather say so than book you in and disappoint you: a fault that only shows under load or after a few miles has to be driven to be found, and road testing can’t be squeezed into a slot. The £69 is usually credited against the repair when the work is booked in with us. It’s job dependent and not automatic on smaller jobs, and you’ll know where you stand before you commit to anything.
This is a different situation from a rattle, not a later stage of it. Once a chain has jumped a tooth or snapped, the valves and the pistons are no longer working to the same timing, and every turn of the starter risks them meeting. Cranking it again to see if it’ll catch is how a chain job becomes an engine.
So leave it where it is. We run our own recovery truck rather than booking someone else’s, and we’ll bring in a car that won’t start, is stuck in limp mode, or has been standing on a drive for months and nobody’s dared touch. Ring and ask when we can fetch it, and we’ll tell you honestly rather than guess.
The honest answer is that it depends on the engine, and the difference between one car and the next is bigger than most people expect. On some engines the chain sits at the front behind a timing cover and can be reached with the car on the ramp. On others the engine has to be lifted or the subframe dropped to get at it, and on a transverse installation there may be almost no room between the timing end and the inner wing to work in at all. Same part, same principle, very different day.
Whichever it is, a chain is replaced as a kit: chain, guides and tensioner together. Fitting a new chain against worn guides simply puts the noise back a few thousand miles later, and by then you’re paying the labour to reach it a second time. That labour is most of the bill on this job, which is why it’s worth doing once and properly.
The ranges published elsewhere run from a few hundred pounds to well over a thousand, and none of them is about your car. The price of a chain job comes down to which engine it is and how much has to come off to reach the timing case, so a figure quoted before anyone has looked is a guess dressed up as a quote.
What we can tell you now is the £69 to confirm the fault. After that you get the figure for the actual repair on your actual car, with what it covers, and nothing is started until you’ve approved it. If you want a day to think it over, the car sits where it is and nobody touches it.
Look at what’s in the workshop on a given week and it’s heavily Ford, Peugeot and Citroën. That’s not a specialism we chose, it’s a consequence of one design decision: the 1.0 EcoBoost and the 1.2 PureTech both run a belt in oil, that belt breaks down, and the cars arrive here in numbers because of it. We take all makes and models, petrol, diesel, hybrid and electric, and the marque concentration isn’t a limit on what comes in.
Two sorts of caller in particular are worth saying this to. If somebody has already thrown a part at your noise and the noise is still there, that job is routine here rather than awkward, and we’d start again from the symptom rather than from what was fitted last. And if the car is old enough that you assume it isn’t worth diagnosing, we’ll still have it in. Older cars a main dealer would rather not book in are a normal part of the week.
We should be straight about where we are. The workshop is a single unit on the Medway City Estate at Rochester, just off the A289, and the towns we normally serve are Chatham, Gillingham, Rainham, Rochester, Strood and Gravesend. Bexleyheath isn’t round the corner from us, so this is written as people travelling to us rather than the other way round.
From Bexleyheath it’s the A2 east, past Dartford and Gravesend, then off onto the A289 for the estate. If the car won’t drive, it comes in on our truck instead. When you ring, you’re speaking to the people who’ll have the car on the ramp, not a booking platform passing the job on to a workshop it won’t name.
Phone: 01634 510 780
Email: bookings@medwayvehicleservices.
co.uk
Unit 3 Cliffe Yard, Anthonys Way, Medway City Estate, Rochester, Kent, ME2 4DY
