Land Rover Discovery 4 Engine Specialists
Independent experts across the full Discovery 4 engine range — TDV6, SDV6, SDV8 and 5.0 V8 — including honest crankshaft failure guidance.
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Range Rover
Our experience with the Discovery 4's SDV6 and SDV8 diesels, along with the 5.0 V8 petrol, carries directly across to the equivalent Range Rover and Range Rover Sport models of the same era.
Land Rover
We diagnose and repair every Discovery 4 engine variant, from the TDV6 and SDV6 diesels to the SDV8 and 5.0 V8 petrol, including known crankshaft failure on early diesel units.
Jaguar
Several Discovery 4 engines share components with Jaguar V6 and V8 units of a similar generation, and our workshop applies the same specialist knowledge across both marques.
Land Rover Engine Codes to Help You Find Your Vehicle
| Make | Model | Engine Code | Actual CC | Power kw / hp | Year Range | |
|---|---|---|---|---|---|---|
| Land Rover | Discovery 4 | 276DT | 2720 | 140 kw / 190 hp | 2009-continue | Get Quote |
| Land Rover | Discovery 4 | 306DT | 2993 | 155 kw / 211 hp | 2009-continue | Get Quote |
| Land Rover | Discovery 4 | 306PS | 2995 | 250 kw / 340 hp | 2009-continue | Get Quote |
| Land Rover | Discovery 4 | 30DDTX | 2993 | 155 kw / 211 hp | 2009-continue | Get Quote |
| Land Rover | Discovery 4 | 30HD0D | 2995 | 250 kw / 340 hp | 2009-continue | Get Quote |
| Land Rover | Discovery 4 | 508PN | 4999 | 276 kw / 375 hp | 2009-continue | Get Quote |
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Reviews
"Knocking sound on my early SDV6 was diagnosed as crankshaft wear before it caused catastrophic damage. Grateful they caught it when they did."
Graham S. - SDV6 Crankshaft Wear
1 month ago
"Weighed up TDV6 versus SDV8 for a rebuild and they gave me genuinely useful, unbiased advice rather than just pushing the most expensive option."
Julie N. - Unbiased Advice
1 month ago
"5.0 V8 engine work came back running beautifully. Clear communication throughout and the price matched the original quote exactly."
Peter W. - 5.0 V8 Work
1 month ago
"SDV8 turbo replacement handled quickly and professionally. First garage that actually seemed to understand this engine rather than treating it like a generic diesel."
Anita R. - SDV8 Turbo Replacement
1 month ago
"Full engine replacement after a failed SDV6 was completed within the timeframe promised. Collection and delivery made the whole process painless."
Colin B. - Full Engine Replacement
1 month ago
"Really appreciated the honest crankshaft failure explanation before I committed to a repair. Felt like proper expert advice rather than a sales pitch."
Fiona J. - Crankshaft Explanation
1 month ago
"Knocking sound on my early SDV6 was diagnosed as crankshaft wear before it caused catastrophic damage. Grateful they caught it when they did."
Graham S. - SDV6 Crankshaft Wear
1 month ago
"Weighed up TDV6 versus SDV8 for a rebuild and they gave me genuinely useful, unbiased advice rather than just pushing the most expensive option."
Julie N. - Unbiased Advice
1 month ago
"5.0 V8 engine work came back running beautifully. Clear communication throughout and the price matched the original quote exactly."
Peter W. - 5.0 V8 Work
1 month ago
"SDV8 turbo replacement handled quickly and professionally. First garage that actually seemed to understand this engine rather than treating it like a generic diesel."
Anita R. - SDV8 Turbo Replacement
1 month ago
"Full engine replacement after a failed SDV6 was completed within the timeframe promised. Collection and delivery made the whole process painless."
Colin B. - Full Engine Replacement
1 month ago
"Really appreciated the honest crankshaft failure explanation before I committed to a repair. Felt like proper expert advice rather than a sales pitch."
Fiona J. - Crankshaft Explanation
1 month ago
Full Engine Range
Discovery 4 Specialists
Choosing the Right Engine for Your Discovery 4
The Discovery 4 was offered with a wider engine range than most generations, and each option has its own strengths, weaknesses and running costs worth understanding before committing to a repair or rebuild.
Whichever engine your Discovery 4 has, we carry the diagnostic experience and parts access needed to keep it running properly, or advise honestly when a replacement makes more sense.
Crankshaft Failure: What Discovery 4 Owners Should Know
Crankshaft failure, most associated with early TDV6 and SDV6 diesel engines, occurs when bearing wear allows excessive play within the engine, eventually leading to metal-to-metal contact and serious internal damage.
The warning signs are usually clear: a knocking or rumbling noise from the engine, often more noticeable under load, alongside a drop in oil pressure that can trigger a dashboard warning. These symptoms shouldn't be ignored or driven through.
We assess bearing condition and oil pressure using proper diagnostic equipment on any Discovery 4 showing these signs, giving you an honest picture of whether repair or replacement is the right route.
Crankshaft Diagnostics
Bearing Wear Assessment
Rebuilds and Replacements Matched to the Right Engine
Working across the full Discovery 4 engine range means treating each variant according to its own specific needs, rather than applying a generic diesel or petrol repair process to every job.
TDV6 and SDV6 work accounts for crankshaft and timing chain condition, SDV8 rebuilds address the particular demands of a towing-focused diesel V8, and 5.0 V8 work is carried out to the standard this refined petrol engine deserves. Every job is tested thoroughly before handover.
The outcome is a Discovery 4 that runs reliably regardless of which engine sits under the bonnet, backed by a warranty and genuine specialist knowledge.
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Explore Article→Why the Discovery 4's Engine Choice Matters for Repairs
With four distinct engine options across its production run, the Discovery 4 needs a workshop that understands the specific fault patterns of each variant, rather than one applying blanket diesel or petrol knowledge across the board.
Because we work across the full range regularly, we know which TDV6 and SDV6 units are more exposed to crankshaft risk, how SDV8 turbos typically wear, and what to expect from the 5.0 V8 over time. That breadth of knowledge means faster, more accurate diagnosis whatever engine your Discovery 4 has.
Every quote is provided in writing before work begins, so you always know exactly what you're paying for.
Frequently Asked Questions
Everything you need to know about our Range Rover and Land Rover engine rebuild, replacement and repair services - answered by our JLR-trained specialists.
Request A Quote01Is the Land Rover Discovery 4 reliable?
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Is the Land Rover Discovery 4 reliable?
Widely regarded as one of the more dependable Discovery generations, particularly on later SDV6 and SDV8 diesels. Early TDV6 and SDV6 units carry a known crankshaft failure risk, so servicing history and prompt attention to warning signs matter significantly.
02Why does the Discovery 4 suffer crankshaft failure?
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Why does the Discovery 4 suffer crankshaft failure?
Crankshaft failure is typically caused by bearing wear that allows excessive movement within the engine, most associated with early TDV6 and SDV6 diesel units. It's a known issue we check for as standard during diagnostics on affected engine variants.
03Which is better: TDV6, SDV8 or 5.0 V8?
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Which is better: TDV6, SDV8 or 5.0 V8?
Each suits a different priority. The TDV6 and SDV6 offer efficiency, the SDV8 provides strong towing performance, and the 5.0 V8 delivers smooth, refined power at the cost of higher running expenses. We can advise based on your specific use case.
04How much does an engine rebuild cost?
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How much does an engine rebuild cost?
Cost varies significantly depending on the engine variant and the extent of the work required. We provide a fixed, written quote after inspection, so you know the full cost before any work is authorised.
05Which engines did the Discovery 4 use?
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Which engines did the Discovery 4 use?
The Discovery 4, known as the LR4 in North America, was offered with the 3.0-litre TDV6 and later SDV6 diesels, the 4.4-litre SDV8 diesel, and a 5.0-litre naturally aspirated petrol V8.
06Do you collect the vehicle or do I need to bring it in?
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Do you collect the vehicle or do I need to bring it in?
We offer nationwide collection and delivery, so distance from our workshop isn't a barrier to getting your Discovery 4 properly assessed. You're also welcome to drop the vehicle off yourself.
07Is there a warranty on reconditioned or replacement engines?
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Is there a warranty on reconditioned or replacement engines?
Yes, every reconditioned and replacement engine we supply and fit is covered by a warranty, giving you confidence in the work carried out.
08How long does a Discovery 4 engine repair or replacement take?
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How long does a Discovery 4 engine repair or replacement take?
Most repairs and replacements are completed within one to two weeks, depending on the engine variant and parts availability. We'll confirm an accurate timeframe once we've inspected your vehicle.
Professional Solutions
Visit Our Workshop
Our fully equipped workshop in Grays, Essex serves customers across London, the South East,
and the whole of the UK — with nationwide collection and delivery available.
Contact Information
Visit our specialist workshop in Grays, Essex. We welcome walk-ins and pre-booked appointments for all Range Rover and Land Rover engine enquiries.
Opening Hours
Monday - Friday: 9:00 AM - 6:00 PM
Saturday: 8:00 AM - 2:00 PM
Sunday: Closed