Nissan Navara: D40 YD25 Dual-Mass Flywheel (DMF) Failure

Manual transmission D40 Navaras fitted with the YD25DDTi diesel engine use a dual-mass flywheel (DMF) to dampen the high torque pulse frequency of the common-rail diesel. The DMF contains internal springs and damping grease that degrade over time, particularly under towing loads, hill starts, or any driving style involving low-rpm high-load situations. As the DMF wears, its internal spring mechanism breaks down, causing the two flywheel masses to rattle against each other. A failed DMF transmits shock loads directly to the gearbox input shaft and can damage the clutch assembly simultaneously. Replacement of the DMF necessitates removal of the gearbox and transfer case, and the clutch is typically replaced at the same time. Failures commonly occur from 120,000 km onwards.

• Rattling or clunking noise at idle that disappears when clutch pedal is depressed
• Juddering or shuddering when pulling away from a standstill
• Vibration through the gear lever at idle
• Clunking sound when engine is switched off as it winds down
• Clutch engagement shudder at low speed

With the engine at idle and in neutral, depress the clutch and listen for the rattle to disappear — this isolates the DMF as the noise source. Test clutch take-up at very low speed on a hill to feel for judder. Ask the seller if the clutch has ever been replaced and confirm what flywheel was installed (OEM DMF or solid flywheel conversion). A solid flywheel conversion is an acceptable fix but adds drivetrain vibration.

Parts involved: Clutch.

$2,200 to $4,000 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 clutch or flywheel ever been replaced, and do you have the workshop invoice?”
• “Was the flywheel replaced with an OEM dual-mass or a solid flywheel conversion kit?”
• “Does the vehicle tow or carry heavy loads regularly?”
• “Have you noticed any rattling at idle or judder on take-off?”

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.