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TDV6 / SDV6 vs 1.4 HDi: which engine is more reliable?

According to our risk index, the 1.4 HDi carries less risk than the TDV6 / SDV6: 43/100 versus 46/100 (both moderate risk). The TDV6 / SDV6 has 2 documented serious faults, the main one being «Crankshaft breakage and spinning main bearing shells»; the 1.4 HDi has 1 documented serious fault, the main one being «Timing belt and water pump».

Risk index

TDV6 / SDV6

46

Moderate risk · 2 serious faults

Risk index

1.4 HDi

43

Moderate risk · 1 serious fault

Lower risk

The index (0–100) weights the severity and frequency of the three most serious documented faults. How it is calculated

11 sourcesHow we work

Is the TDV6 / SDV6 reliable?

The Land Rover and Jaguar TDV6/SDV6 diesel V6 engines, shared with Peugeot and Citroën, have a serious documented fault: crankshaft and main bearing shells on the 3.0, and the belt-driven oil pump on the 2.7. Insist on a service history and weigh up the repair cost before buying.[1][2][3]

See the 3 of the TDV6 / SDV6 faults

Is the 1.4 HDi reliable?

It is a small diesel that is generally reliable, but with a very well-documented weakness: the injectors tend to lose their seal over time and let diesel escape. The turbo and the EGR valve also fail on a noticeable minority of units, and there are isolated cases of the crankshaft damper pulley failing at very high mileages. The timing belt does not seem to cause more problems than on any diesel of its era if it is changed on time.[4][5][6]

See the 5 of the 1.4 HDi faults

Side-by-side comparison

Comparison of TDV6 / SDV6 and 1.4 HDi
TDV6 / SDV61.4 HDi
Technical data
TypeEngineEngine
FuelDieselDiesel
Displacement2,720 cm³1,399 cm³
TimingWet belt (belt-in-oil)Timing belt (dry)
Power188–302 hp54–92 hp
Production2004–2018[7]2001–2010[4][8][9][10]
Reliability
Risk index (what is it?)46Moderate risk43Moderate risk
Documented faults35
Of high or critical severity21
Worst severityCritical severityHigh severity
Main faults
  1. Critical severity: Crankshaft breakage and spinning main bearing shells
  2. Critical severity: Broken oil pump housing and timing belt jumping on the 2.7
  3. Medium severity: Turbo and pneumatic actuator failure on the 3.0 TDV6/SDV6
  1. Medium severity: Injectors that lose their seal and let diesel escape
  2. High severity: Timing belt and water pump
  3. Medium severity: Premature turbo wear from poor lubrication
Most expensive documented repairNo reliable dataNo reliable data
Which versions to buy
BuyRecommended versionsNoneNone
With cautionVersions to be cautious about
  • 2.7 TDV6 (276DT/DT17, 2004-2010)[3][11]
  • 3.0 TDV6/SDV6 (306DT, 2009-2018)[1][2]
  • 1.4 HDi/TDCi 54/68/70 8V (DV4TD, 2001-2009)[5][6]
  • 1.4 HDi 90/92 16V (DV4TED4, 2002-2009)[5][10]
AvoidVersions to avoidNoneNone

Severity of each fault: green, low; amber, medium; red, high; dark red, critical. How we rate them

Cars that each one is fitted to

TDV6 / SDV6

See the 15 models with the TDV6 / SDV6

1.4 HDi

See the 12 models with the 1.4 HDi

Other comparisons

With the TDV6 / SDV6

With the 1.4 HDi

Compare other engines

That is the comparison you are viewing: change one of the two engines.

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. Land Rover 2.7 TDV6 Timing Belt Replacement GuideBudget Parts (roverparts.eu) · Technical documentation · consulted 5 October 2026
  4. Motor PSA DVWikipedia (es) · Other source · consulted 27 September 2026 · in Spanish
  5. Essai, avis et fiabilité des 1.4 HDI 68 chFiches-Auto.fr · Motoring press · consulted 27 September 2026 · in French
  6. Essai, avis et fiabilité des 1.4 HDI 70 chFiches-Auto.fr · Motoring press · consulted 27 September 2026 · in French
  7. Ford AJD-V6/PSA DT17 engineWikipedia · Other source · consulted 5 October 2026
  8. Ford Duratorq engineWikipedia (en) · Other source · consulted 27 September 2026
  9. Peugeot DV4TD engine: specifications and applicationsMyMotorList · Technical documentation · consulted 27 September 2026
  10. Peugeot DV4TED4 engine: specifications and applicationsMyMotorList · Technical documentation · consulted 27 September 2026
  11. TdV6 Timing BeltLes Richmond Automotive (lrautomotive.com.au) · Technical documentation · consulted 5 October 2026