Land Rover Discovery 4 TDV6 Engine Seized? Rebuild vs Replacement Costs UK

Used vs Reconditioned Discovery 4 Engines: Which Should You Choose?

A seized or knocking Discovery 4 3.0 TDV6 leaves you with an expensive decision: rebuild your engine, choose a used or reconditioned replacement, or sell the vehicle as spares or repair. This guide compares the inspection evidence, costs and warranty questions that matter before you request a reconditioned Land Rover Discovery 4 engine replacement quote.

Can a seized Discovery 4 TDV6 be rebuilt or does it need replace?

The decision depends on measured damage, not mileage alone. If the crank has turned in the shells and the block is scored, replacement is the route discussed here. If damage is confined to the top end and the bottom end measures within tolerance, a rebuild may be viable. Before comparing TDV6 engine rebuild quotes, ask for the crankshaft, bore and block inspection findings in writing.

Is a Discovery 4 engine rebuilding worth the money?

On a 2012 Discovery 4 with 130,000 miles and a documented history, I would rebuild with a tested crank and uprated shells, because the car is worth keeping and the rebuild keeps the original engine number. On a 2010 car with 190,000 miles, a tired gearbox and rust underneath, I would sell it spares or repair and put the money towards something else.

How do you know which side of the line you are on?

Test	Result that means rebuild	Result that means replace
Crankshaft journal measurement	Within tolerance	Scored or oval
Bore condition	Honed and reusable	Deep scoring or cracks
Oil pump and drive	Reusable with new parts	Destroyed
Crankcase and webs	Sound	Cracked
Head surfaces	Reusable after skim	Warped beyond limits

Those five results, in writing, decide the job. Any workshop refusing to measure before quoting is guessing with your money.

Discovery 4 TDV6 engine rebuild and replacement costs UK

Route	Cost	Time	Warranty
Top-end repair with shells	£2,000–£3,200	1–2 weeks	12 months typical
Full rebuild of your engine	£3,500–£5,500	3–5 weeks	12 months typical
Used TDV6 engine fitted	£2,400–£4,200	1–2 weeks	30–90 days
Reconditioned TDV6 engine fitted	£4,500–£7,000	2–4 weeks	12 months written
Scrap or spares or repair sale	Loss of the car's value	Immediate	None

Use the figures above as this guide’s indicative comparison, not a confirmed current quotation or guaranteed warranty. When checking Discovery 4 engine replacement cost UK, request an itemised fitted price and confirm VAT, removal and installation, fluids, ancillary parts, core exchange charges and warranty exclusions. Ask the supplier to confirm the turnaround and cover for your engine in writing.

Ready to compare your options? Request a used Land Rover Discovery engine supply and fit quote using your registration, mileage, symptoms and any diagnostic report. Ask for rebuild and replacement options separately so you can compare the same scope of work rather than an engine-only price against a fitted total.

Which TDV6 engine do you have?

Engine	Models	Years	Notes
2.7 TDV6	Discovery 3, Range Rover Sport	2004–2009	Early crank and pump issues
3.0 TDV6 (306DT)	Discovery 4, Range Rover Sport, Range Rover	2010–2018	Crank failure and pump drive
3.0 SDV6	Discovery 4, Range Rover Sport	2010–2018	Higher output, same base
3.0 TDV6 (306DTX)	Later Discovery 4	2014–2018	Revised parts

Before ordering a replacement Discovery 4 engine, confirm the engine code against your registration and the JLR parts catalogue. Output variants differ in mapping and some hardware, so ask the supplier to confirm compatibility in writing rather than relying on the TDV6 or SDV6 badge alone.

What actually kills a TDV6?

·        Crankshaft failure from oil starvation or a failing pump drive.

·        Timing belt and tensioner neglect.

·        Turbo failure sending debris through the engine.

·        Overheating after coolant loss.

·        Short-journey use that never gets the oil to temperature.

Most of these are preventable with maintenance and, crucially, with acting on the first noise rather than the first failure.

Used or reconditioned TDV6 engine: which option suits your plans?

A used TDV6 engine fitted may suit a tight budget or a car you plan to sell within a year, but its history and test evidence matter. If you intend to keep the vehicle, compare a reconditioned Discovery 4 engine with a rebuild of your original unit. Check the actual parts replaced, recorded tolerances and written cover rather than treating the word “reconditioned” as a guarantee of quality.

·        Used suits short ownership and tight budgets.

·        Reconditioned suits long ownership.

·        Rebuild suits matching-numbers cars.

·        All three need the pump drive and timing addressed.

·        Never fit without a written warranty.

What should a TDV6 supply and fit quote and invoice include?

·        Engine number and code.

·        Measured tolerances on any rebuild.

·        Parts replaced, listed individually.

·        Warranty duration and mileage cap.

·        Disposal or core exchange credit.

·        Road test and fault-code confirmation.

Frequently asked questions

Can a seized TDV6 be rebuilt?

Sometimes. A seized TDV6 engine rebuild depends on the condition of the crankshaft, bores and block. This guide treats a scored crank as a replacement case; ask for a written inspection report before committing to either route.

How much is a reconditioned Discovery 4 engine fitted?

This guide gives £4,500–£7,000 for a reconditioned Discovery 4 engine supplied and fitted with a written warranty, depending on the unit and specification. Treat that as an indicative range, not a live offer. Confirm the fitted total, VAT, included parts and exact warranty terms with the supplier.

Is the 3.0 TDV6 a bad engine?

It is a strong engine with known failure points. Maintained properly and monitored for pump drive and crank issues, it serves well.

Should I scrap a Discovery 4 with a blown engine?

Value the car with a running engine, subtract the repair, then compare with what it will fetch spares or repair. That comparison, not sentiment, should decide it.

How long does a rebuild take?

The rebuild time scale used in this guide is three to five weeks, including machining. A reconditioned exchange unit is another option to compare, but availability and installation timing need confirming. Ask for the expected completion date alongside your TDV6 engine rebuild quote.

What does the measurement process involve?

Strip the engine, measure the crankshaft journals with a micrometer, check the bores with a bore gauge, pressure test the heads, and inspect the block for cracks between the webs. Those measurements, recorded as a report, tell you whether a rebuild is honest or optimistic.

·        Journal diameter and ovality recorded.

·        Bore wear and taper measured.

·        Head surfaces pressure tested and checked for warp.

·        Block crack tested around the webs.

·        Oil pump and drive assessed for reuse.

·        Everything written down with the numbers attached.

What are the warning signs before a TDV6 seizes?

A TDV6 rarely seizes without warning. In most cases the driver noticed something weeks earlier and carried on.

·        Metallic rattle on cold start that fades.

·        Oil pressure warning that flickers when hot.

·        A knock under load that disappears at idle.

·        Rising oil consumption with no visible leak.

·        Metal sheen in the oil at service time.

Any one of those justifies an oil pressure test and a sump inspection. Together they almost always mean trouble.

Is a second-hand engine from a running car safe?

It is a fair question, and the honest answer is that it depends on evidence rather than the story attached to it. Ask for a compression test, a hot oil pressure reading and the mileage of the donor car, and treat a refusal as a red flag.

·        Compression figures across all cylinders.

·        Hot idle oil pressure reading.

·        Donor mileage and reason for dismantling.

·        Warranty terms with a mileage cap.

·        Payment method that gives you recourse.

What is the realistic life of a rebuilt TDV6?

With measured tolerances, uprated shells, a new pump drive and correct oil, 120,000 miles is a realistic expectation. Poor servicing and short journeys will shorten that significantly regardless of how good the rebuild was.

How do you choose a workshop for this work?

When choosing a Land Rover TDV6 engine specialist, ask how many TDV6 rebuilds they complete each year, which tolerance they work to and whether you can review the measurements before collection. Compare the written scope, test evidence and warranty rather than choosing on the lowest headline price alone.

What should you check before committing to a rebuild?

Before accepting a Discovery 4 engine rebuild quote, request the measurement report, itemised parts list and warranty terms in writing. Recorded tolerances explain why the proposed repair is suitable and give you evidence to compare with a replacement engine quotation.

Item to request	Why it matters
Journal measurements	Proves the crank is reusable
Bore measurements	Proves the block is sound
Head pressure test	Rules out hidden cracking
Parts list	Shows what was actually new
Warranty terms	Gives you recourse if it fails

How long should a rebuilt TDV6 last?

With measured tolerances, uprated shells, a new pump drive and correct oil at short intervals, 120,000 miles is realistic. Poor servicing, short journeys and ignored warnings will shorten that no matter how good the build was.

Is it worth rebuilding a car with 200,000 miles on it?

Only if the rest of the vehicle justifies it. Rust, a tired gearbox and worn suspension will eat the value of a new engine. On a sound car at that mileage, a rebuild can still make sense; on a tired one, it rarely does.

What are the early signs that a TDV6 is in trouble?

·        Metallic rattle from cold that fades when warm.

·        Oil pressure warning flickering at idle when hot.

·        Knock under load that disappears at idle.

·        Rising oil consumption with no visible leak.

·        Metal sheen in the oil at service time.

Any one of those justifies an oil pressure test and a sump inspection the same week.

How do you value a Discovery 4 that needs an engine?

Look up what a running example sells for privately, subtract the fitted cost of the engine you would choose, then subtract a margin for risk. That number is what your car is worth as it stands, and it is nearly always lower than owners expect.

Step	What to use
Running value	Private sale prices for the same year and mileage
Minus engine cost	Fitted price, not engine-only price
Minus risk margin	15–25% for a buyer taking on a failure
Result	Realistic spares-or-repair value

What is the one-line answer on a seized TDV6?

Measure the crank and the bores before you decide anything, because those two numbers separate a rebuild from a replacement engine.

Compare Discovery 4 engine options and request an assessment

For a Discovery 4 TDV6 engine replacement quote, provide your registration, engine code if known, mileage, symptoms and any workshop findings. Explain whether you want supply only or supply and fitting, and ask for the total cost, compatibility confirmation and written warranty before authorizing work.