Land Rover Range Rover: 4.4 V8 M62 Timing Chain Guide Failure

Early L322 Range Rovers used the BMW-designed M62 4.4-litre V8 petrol engine, which routes drive to dual overhead camshafts via a multi-stage chain system with plastic guide rails. These guides are manufactured from a nylon-based composite that embrittles and fractures under sustained heat cycling and oil degradation products. As the guides disintegrate, chain tensioning is lost, the primary and secondary chains stretch and develop slack, and timing retards unevenly across the two banks. Cold-start chain rattle progresses to persistent rattle at all temperatures, followed by camshaft position errors, misfires, and ultimately piston-to-valve contact if the chain skips a tooth. Infrequent oil changes significantly accelerate guide degradation.

• Rattling from front of engine on cold start that may partially clear when warm
• Persistent chain rattle at all operating temperatures in advanced cases
• Misfires on multiple cylinders with camshaft timing fault codes
• Rough idle that worsens progressively over months
• Check engine light with P0340/P0345 or cam position correlation codes
• Engine management limp mode

Cold-start the engine after it has sat overnight and listen carefully to the front of the engine for chain rattle in the first 10-30 seconds. Request full service history documenting oil change intervals — anything beyond 10,000 km intervals is a risk flag. Any rattle that appears at warm idle indicates advanced guide failure. If a workshop inspection is possible: Connect a diagnostic tool and read for stored cam timing and cam position correlation fault codes.

Parts involved: Timing chain.

$2,800 to $14,000 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.

• “Has the timing chain, guides, and tensioners been replaced?”
• “What has the oil change interval been throughout the vehicle's life?”
• “Has the check engine light ever been present, or are there any stored fault codes?”

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.