01
Primary manufacturer evidence
JLR technical knowledge
SSM72578 documents crankshaft/crankshaft-bearing failure, rotation of main-bearing shells, seizure, metallic debris and severe knocking in the 3.0 TDV6.
Stage 1Public-interest researchOpen call for evidence
JLR 3.0 TDV6/SDV6catastrophic engine failures
A UK-wide public-interest investigation into recurring crankshaft and main-bearing failures, manufacturer technical knowledge, replacement engines, consumer harm and international regulatory action.
Independent specialists consulted in this research describe failure volumes running into the thousands across the UK. That scale is a significant research signal, not yet an independently audited national count. Stage 2 is designed to test and quantify it.
Thousands?
UK failures described by specialists — scale to verify
UK-wide
specialist repair market and owner reports
600+
DVSA documents
68,828
China recall
1,338
China warranty / claim cases
50→30 μm
JLR tolerance change
* “Thousands” is professional testimony/intelligence supplied to Stage 1 and is not presented as a verified UK prevalence figure. The research is actively seeking auditable garage, warranty and manufacturer data.
Public safety
Sudden catastrophic engine failure can interrupt motive power.
Replacement engines
The specification of remanufactured replacement engines is a central unanswered question.
Regulatory scrutiny
Overseas recall actions create a legitimate UK comparison question.
Potential scale
A mature UK specialist repair market and reports of large case volumes make national quantification necessary.
Stage 1 findings
What is established so far
02
Primary manufacturer evidence
A documented engineering change
JLR recorded a reduction in maximum crankshaft main-bearing run-out tolerance from 50 microns to 30 microns from a specified engine number.
03
Primary regulator evidence
China recalled 68,828 vehicles
The official Chinese defect record refers to crankshaft assembly/manufacturing issues, insufficient bearing lubrication, premature wear and an improved-engine remedy where risk was identified.
04
Primary regulator evidence
South Korea also intervened
South Korean authorities undertook recall action and later re-recall activity involving JLR diesel vehicles. Direct technical comparison with the UK population remains necessary.
05
Primary correspondence
DVSA holds a substantial evidence record
DVSA confirmed that it identified more than 600 documents that may be relevant to the wider FOIA request, including customer communications and manufacturer information.
06
Primary correspondence
Replacement-engine questions remain
JLR confirmed in correspondence that a relevant replacement engine is remanufactured and that no brand-new complete assembly is available. The unresolved question is what corrective engineering changes are incorporated.
International comparison
Different jurisdictions, different responses
| Jurisdiction | Regulatory position | Stage 1 significance |
|---|---|---|
| United Kingdom | No equivalent crank-bearing recall identified | DVSA holds 600+ potentially relevant documents |
| China | Recall | 68,828 vehicles; improved engine where risk identified |
| South Korea | Recall + re-recall | JLR diesel vehicles; further technical comparison required |
| United States | No equivalent recall identified in Stage 1 | JLR technical communications preserved by NHTSA |
| Canada | Comparator only | Separate seizure-related engine recall; not defect equivalence |
Stage 2
What now needs to be answered
These questions are designed to be tested against engineering records, regulator correspondence, warranty data and structured case evidence.
- 1What is the confirmed UK failure population by engine code, production period and mileage?
- 2Can specialist garages and rebuilders provide de-duplicated job-level data to test claims of thousands of UK failures?
- 3What engineering analysis led to the 50 μm → 30 μm run-out tolerance change?
- 4What exactly was changed in the ‘improved engine’ used in China?
- 5Are the same changes present in UK service/remanufactured replacement engines?
- 6What did JLR tell DVSA about the Chinese and South Korean actions, and why did the UK response differ?
- 7How often have replacement/remanufactured engines subsequently suffered materially similar failures?
Open research
Help establish the true UK scale
Affected drivers, garages, engine rebuilders, engineers, warranty professionals, regulators, journalists and current or former industry personnel are invited to contribute. The aim is to move from large-scale professional reports and public signals to a de-duplicated, auditable UK evidence base. Contrary evidence is expressly welcome.