A rattle for the first few seconds after a cold start, a timing correlation code on a printout, or a garage that has said “timing chain” and handed you a quote with four figures on it. Before the front of an engine comes apart, the chain has to be confirmed as the fault rather than assumed from a noise described over the counter. That’s where we start with cars coming to us from Maidstone: diagnose it, agree the figure, and open nothing until you’ve said yes.
There’s no service interval for a chain. It’s replaced on condition, and the condition changes slowly, so the first sign is nearly always a noise rather than a breakdown. Overnight the oil drains back down the engine and the tensioner loses its pressure, so on the first turn of a cold start the slack in a stretched chain is free to slap against its guides until oil pressure builds and takes it back up. That’s why it’s loud for a few seconds and then gone, and why people convince themselves they imagined it.
As the chain lengthens, the camshafts sit fractionally out of step with the crankshaft. The ECU compares the two signals, sees the mismatch and stores a correlation fault, sometimes dropping the car into limp mode. These are what drivers usually turn up with:
Not one of those proves the chain on its own. A tired tensioner, a cam sensor or its wiring, low oil pressure, an auxiliary belt component or a wet belt in oil can all make much the same noise and set much the same codes, and none of them costs what a chain job costs.
Our diagnostic is £69. On this job that buys stored and pending codes including timing correlation faults, the freeze-frame data captured when the fault set, live cam and crank signals watched while the engine runs, and somebody standing over the engine listening to it cold rather than guessing from a description over the phone. 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 we tell you which way it falls before you commit to anything.
If you’ve already had a part fitted somewhere on the strength of a code and the rattle or misfire is still there, that’s worth a second look rather than a second part. A fault code names a circuit, not a cause. Replacing the component the code mentions is how people spend money and still have the fault.
Yes, it’s a big job, and it’s fair to say so. The chain sits behind a cover at the end of the engine, so reaching it means taking off whatever is in front of it: ancillaries, belts, mountings, sometimes the sump to get at the lower guide. How much comes off varies enormously between engines, which is why one car is a day’s work and another with the same fault is not. The car stays with us while it’s apart rather than waiting on your drive, and you get the time it’ll take along with the quote.
When it’s back together the timing is verified, the codes are cleared and rechecked to be sure they stay clear, and the car goes out on a road test before it comes back to you. You’ll be shown the old chain and guides and told what actually failed. On a bill this size, knowing why it wore out matters as much as the new parts.
A chain job is rarely just a chain. The chain runs against plastic guide rails and is held in tension by a hydraulic tensioner, and all three wear together, because they’ve done the same miles under the same oil. Fit a new chain against worn guides and the tensioner takes up the difference for a while, then the rattle comes back and you pay the labour a second time.
So with the engine open, the guides, tensioner and sprockets get measured and looked at properly. If they’re good, you don’t buy them. If they’re worn, changing them while everything is already apart is the sensible call, because almost all of what this repair costs is the work to get in there, not the parts themselves.
We won’t put a figure on this page, because a chain price quoted blind is a guess and you’d be entitled to hold us to it. What it comes down to is three things: which engine it is and how much has to come off to reach the chain, whether it’s the chain alone or chain, guides, tensioner and sprockets, and what shows up once it’s open. Broken guide material doesn’t stay where it fell, it goes into the oil, so the oil side gets checked rather than assumed.
The only figure we publish for this work is the £69 diagnostic. Once that’s done you get the price and what it covers, in plain words, and nothing starts until you’ve approved it. If you want time to think about it, the car sits untouched.
Plenty of cars sold as chain engines aren’t. Ford’s 1.0 EcoBoost and PSA’s 1.2 PureTech both run a wet belt, a cambelt that lives in the engine oil, and as it ages the belt sheds material that travels round and blocks the oil pickup. A rattle plus an oil pressure light on one of those is a different repair with a far greater urgency, and a driver who books a timing chain on a PureTech has bought the wrong job. It’s the first thing we rule in or out, and wet belt work is most of what goes through this workshop.
We take all makes, petrol, diesel, hybrid and electric, including older cars a main dealer would rather not have on the ramp. That matters here, because a stretched chain is a high-mileage fault on an older car, which is exactly the car most likely to be turned away. And you’ll speak to the people who did the diagnosis, not a call centre or a booking platform where the person who quoted never sees the engine.
There’s no Maidstone workshop and we’re not going to pretend otherwise. We work from a single unit on the Medway City Estate in Rochester, just off the A289. From Maidstone that’s the M20 to junction 6 and up the A229 over Bluebell Hill, or the A229 the whole way through Aylesford, and drivers do it in well under half an hour on a clear run.
If the car won’t make that journey, we come and get it. We own our recovery truck rather than ringing round for one, so a car that won’t start, a car sat in limp mode, a chain that has already jumped or something that’s been parked up for months can all be brought in on the back of it. Ask when you book and we’ll tell you what’s involved.
As for doing it at your address: a timing chain isn’t a roadside job. It needs a lift, clean conditions and the front of the engine stripped, and no mobile mechanic can do that on a driveway in Maidstone or anywhere else. That’s the reason the truck exists.
Phone: 01634 510 780
Email: bookings@medwayvehicleservices.
co.uk
Unit 3 Cliffe Yard, Anthonys Way, Medway City Estate, Rochester, Kent, ME2 4DY
