Renault Trafic: dCi timing chain and tensioner wear — rattle from the front of the engine

The dCi engines in this Trafic are chain-driven, and premature timing chain wear is a recognised fault — most reported on the 2.0 dCi, though the warning sign and the consequence are the same across the range. It announces itself as a rattle from the front of the engine, and it is worth acting on rather than living with, because a chain that jumps timing on these engines does catastrophic damage. The tensioner can fail on its own and produces the same noise. What makes this a fault about paperwork as much as mechanics is the cause: chain and tensioner wear on these engines tracks oil neglect almost exactly, so a van with stretched service intervals or the wrong oil grade is the one at risk. Vans get worked hard and serviced late, which is why this is worth taking seriously on a commercial vehicle.

• Rattle from the front of the engine, worst in the first seconds after a cold start
• Rattle lasting longer, or present when warm, as it worsens
• Engine warning light with camshaft and crankshaft correlation codes
• Rough running, loss of power, or a no-start once the chain has jumped
• Oil that is black, thin or below the mark on the dipstick

Insist on a stone-cold start and be standing at the front of the van when the key is turned — if it has been warmed up before you arrive, arrange to come back, because a warm engine hides this and it is the most useful thing you will learn. Listen to the first five seconds for a rattle or chatter from the front of the engine; a healthy one is quiet almost immediately. Have someone blip the throttle once it is warm and listen again. Pull the dipstick and look at the level and the colour, because oil is the whole story with this fault. Then ask for the service history and read the dates and mileages rather than accepting a summary — a van with gaps, or with a jump of 30,000 km between oil changes, is a different risk from one serviced on time. Ask the seller directly whether it rattles on a cold morning and how long it has done so. If a workshop inspection is possible: have the fault memory read for camshaft correlation codes and the chain assessed before agreeing a price.

Parts involved: Timing chain.

$1,400 to $4,500 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

• “Does it rattle at all when started from cold?”
• “How often has the oil been changed, and can I see the invoices?”
• “Has the timing chain or tensioner ever been replaced?”

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.