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Ford-PSA AJD-V6 / DT17: 2.7 TDV6 (276DT) and 3.0 TDV6/SDV6 (306DT)Urgency: As soon as possible

Deep metallic engine knock in the TDV6 / SDV6 engine: causes

In the TDV6 / SDV6 engine, 1 documented fault may be the cause: crankshaft breakage and spinning main bearing shells.[1][2]

What to do now

As soon as possible

Switch the engine off and do not drive on. Carrying on can snap a connecting rod and leave the engine beyond repair.

What it means

A deep knock that gets louder with engine speed usually points to internal damage, such as big-end bearings worn through lack of lubrication. It is one of the most serious faults an engine can have.

Engine knock: causes in all cars

6 sourcesHow we work

Engine faults that cause it

From most to least important. Under each fault, how the symptom shows up. Check the affected years and versions on each page.

  1. Source for the symptom[1][2]

Other common causes: engine knock

Besides the documented faults of the TDV6 / SDV6, these are the most common causes on any car according to the sources.

  • Play in the big-end or main bearings (rod knock)[3][4]Common
  • Lack of lubrication: low or degraded oil or insufficient pressure[4][5]Common
  • Stretched timing chain or tensioner without pressure[3][4][6]Possible
  • Hydraulic tappets and valves with play[3][4]Possible
  • Worn pistons and rings[4]Uncommon
  • Normal diesel engine noise[4]Possible

What to check first

  1. Stop the engine as soon as it is safe and check the oil level with the dipstick on level ground and with the engine cold or stopped for a few minutes; it is the first step recommended by Todoaditivos and RACE.[3][5]
  2. Look at the oil pressure warning light (red): if it is on along with the knocking, don't start the engine again and call assistance.[3][5]
  3. Note when it makes the noise: only when cold and for a few seconds (probably tappets or tensioner), or with the engine warm and growing with load and revs (much more serious).[3][4]
  4. Look for oil leaks on the ground or blue smoke, signs that the engine is losing or burning oil, according to RACE.[5]
Complete guide: deep metallic engine knock

Cars with the TDV6 / SDV6 engine

Open yours to see only the faults that affect it according to its years and versions.

Frequently asked questions

Engine knock in the TDV6 / SDV6: what could it be?

In the TDV6 / SDV6 engine, 1 documented fault may be the cause: crankshaft breakage and spinning main bearing shells. Each fault has its own page with the affected years and versions, the cause and how to check for it.

Engine knock in the TDV6 / SDV6: is it serious?

Urgency: as soon as possible. Switch the engine off and do not drive on. Carrying on can snap a connecting rod and leave the engine beyond repair. The most serious fault that causes it on this engine has critical severity.

Sources

Every fact on this page links to its source. If you find an error, let us know.

  1. Land Rover Discovery TDV6 engine failures making headlinesLandyOnline · Other source · published October 2015 · consulted 5 October 2026
  2. Land Rover & Jaguar SDV6/TDV6 Crankshaft RepairJLR Engines · Technical documentation · consulted 5 October 2026
  3. El motor hace ruido en frío: qué es cada ruido y cuál preocupaTodoaditivos · Other source · consulted 29 October 2026 · in Spanish
  4. ¿El motor diésel de tu coche emite un ruido y un traqueteo?RACE · Motoring press · published 22 June 2023 · consulted 29 October 2026 · in Spanish
  5. ¿Qué pasa si el coche se queda sin aceite?RACE · Motoring press · published 26 August 2020 · consulted 29 October 2026 · in Spanish
  6. Las graves (y costosas) averías que puede causar en tu coche la rotura de la cadena de distribuciónDiariomotor · Motoring press · published 17 July 2020 · consulted 29 October 2026 · in Spanish