How much does a Range Rover P38 4.0 / 4.6 V8 engine replacement cost in the UK?

A reconditioned P38 V8 engine typically costs £3,000–£5,500 supply only. A standard rebuild costs £2,000–£4,000, while a top-hat lined rebuild costs £4,000–£7,000. Fitting adds £1,500–£2,500 depending on location and workshop rates.

Is the Range Rover P38 4.0 / 4.6 V8 engine reliable?

No — the P38 V8 has a well-earned reputation for slipped cylinder liners, porous blocks and head gasket failure. The 4.0 is the most prone to liner slippage, followed by the 4.6. The root cause is an aluminium block with a 94mm bore that was essentially overbored from the original Buick design. The only permanent fix is a top-hat liner installation.

What are the common problems with the P38 4.0 / 4.6 V8?

The main issues are: (1) Slipped cylinder liners — the most devastating fault, causing pressurised coolant and overheating, (2) Overheating and cooling system failure — the root cause of liner slippage, and (3) Worn camshaft and timing chain — common on high-mileage examples.

Is it worth replacing a P38 4.0 / 4.6 V8 engine, or should I scrap the car?

Depends on vehicle value and condition. Against a well-kept £5,000–£12,000 P38, a £4,000–£5,500 recon is 30–110% of the car's value. For a clean example with good body and no corrosion, a top-hatted rebuild is a long-term investment that future-proofs the car. However, if the body or air suspension has significant issues, evaluate total restoration costs before committing.

How do I find my P38 V8 engine code?

The engine code is stamped on the cylinder block. GEMS codes include 42D/44D (4.0) and 46D/48D (4.6). THOR codes include 57D/58D (4.0) and 59D/60D (4.6). The D refers to engine prefix — 42D = 4.0 High Compression, 46D = 4.6 High Compression, etc. Tell us your registration and we'll confirm it for free.

Can I prevent slipped liners on the P38 V8?

Prevention is not guaranteed, but you can significantly reduce the risk: (1) Keep the cooling system in perfect order — replace the radiator, thermostat, hoses and water pump preventatively, (2) Never ignore overheating — the first overheat does the damage, (3) Consider fitting a top-hat liner block — this is the only permanent solution, and (4) Use the correct coolant mix and change it regularly. Even with perfect maintenance, liner slippage remains a risk on later P38s.

Range Rover P38 4.0 / 4.6 V81994–20021 Engine Generation (2 Capacities, 2 Management Systems)

Range Rover P38 4.0 / 4.6 V8 Engine Replacement — Compare Prices & Get Quotes

Name: Range Rover P38 4.0/4.6 V8 UK Engine Enquiry Data 2025
Creator: LandRoverEngine.uk

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P38 4.0 / 4.6 V8 Engines — from £800 to £7,000Engine codes: 42D / 46D / 57D / 60D

P38 4.0 / 4.6 V8 Engines — from £800 to £7,000· Engine codes: 42D / 46D / 57D / 60D

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Range Rover P38 4.0 / 4.6 V8 — Which Engine Does Your Car Actually Have?

Four generations. Four eras. One guide to reliability, costs and what really matters.

Era Note

Lucas GEMS management — 4.0 most prone to slipped liners; 4.6 suffers same block weaknesses

GenerationYearsEngine CodeReliabilityRecon CostEra Note

P38A (GEMS) BMW 320d P38A (GEMS)

1994–199942D / 44D (4.0) · 46D / 48D (4.6)★★☆☆☆ [NEWLY ASSIGNED — see Data Note]£3,000–£5,500 [PLACEHOLDER]Lucas GEMS management — 4.0 most prone to slipped liners; 4.6 suffers same block weaknesses

P38A (THOR) BMW 320d P38A (THOR)

1999–200257D / 58D (4.0) · 59D / 60D (4.6)★★☆☆☆ [NEWLY ASSIGNED — see Data Note]£3,000–£5,500 [PLACEHOLDER]Bosch Motronic management — more torque lower down; same fundamental block, similar liner risk

Why use this era map?

Every cost guide, reliability rating and engine code on this page is aligned to the data above. This keeps everything consistent and trustworthy.

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

Range Rover P38 4.0 / 4.6 V8 Engine Replacement Costs

Supply Only£3,000–£5,500

Fitted (Indie)£4,500–£7,000

Warranty12–24 months

Best ForMost owners — best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£800–£1,800£1,800–£3,2001–6 monthsBudget priority; donor engine for rebuild

Reconditioned Engine£3,000–£5,500£4,500–£7,00012–24 monthsMost owners — best cost/warranty balance

Rebuilt Engine (Standard)£2,000–£4,000£3,500–£5,50012–24 monthsLong-term ownership; 3+ year horizon

Rebuilt Engine (Top-Hatted)£4,000–£7,000£5,500–£8,50024–36 monthsThe only permanent fix for liner slippage

Labour estimate: Fitting a P38 V8 engine typically takes 15–25 hours at £65–£95/hr (independent). The engine bay is tight and body lift is often required for access. A standard rebuild costs £2,000–£4,000, while top-hat liners can triple the rebuild cost.

→ Compare P38 4.0 / 4.6 V8 engine prices from UK specialists

Common Problems

1. Slipped Cylinder Liners (The Defining P38 V8 Fault)

Symptoms: Pressurised cooling system, coolant overflow from expansion tank, overheating, head gasket failure, rattling noise when engine is hot. Tapping noise from the block that disappears when cold.

Typical mileage: Any mileage — can occur under normal operating conditions on later P38s. 4.0 engines are most prone, followed by 4.6.

Repair cost: £1,000–£1,200 (re-linering)

Replacement cost: £4,500–£7,000 (full replacement or top-hatted rebuild)

🔴 Immediate - overheating and pressurised coolant indicate imminent failure

Our recommendation:

This is the single most infamous fault on the P38 V8. The 94mm bore on an already-stressed aluminium block means the cylinder liners can move, allowing combustion gases to enter the cooling system. The only permanent fix is a top-hat liner installation — where the liner is machined with a lip that locks it into the block. Standard re-linering is cheaper but may not be a permanent solution. If you see a pressurised coolant system, bubbling in the expansion tank or any overheating, stop driving immediately. A £1,000–£1,200 re-liner is far cheaper than a £4,500–£7,000 replacement.

Read the full slipped liner guide → /failures/slipped-cylinder-liners/ [NEW FAILURE PAGE NEEDED]

1. Slipped Cylinder Liners (The Defining P38 V8 Fault)

Typical mileage: Any mileage — can occur under normal operating conditions on later P38s. 4.0 engines are most prone, followed by 4.6.

Repair cost: £1,000–£1,200 (re-linering)

Replacement cost: £4,500–£7,000 (full replacement or top-hatted rebuild)

🔴 Immediate - overheating and pressurised coolant indicate imminent failure

Our recommendation:

Read the full slipped liner guide → /failures/slipped-cylinder-liners/ [NEW FAILURE PAGE NEEDED]

2. Overheating & Cooling System Failure (Root Cause)

Symptoms: Temperature gauge rising, coolant loss with no visible leak, steam from engine bay, heater blowing cold, pressurised coolant system

Typical mileage: Any mileage — cooling system components age and fail

Repair cost: £200–£700 (radiator, thermostat, hoses, water pump replacement)

Replacement cost: N/A — repair only (does not typically progress to engine replacement if addressed early)

🔴 Immediate - overheating is what causes liner slippage

Our recommendation:

The P38 V8 runs hot — some HSE engines were deliberately mapped to run hotter for emissions compliance. The first overheat does the damage; after that, the damage causes more overheating. The most common causes are a clogged radiator, failed thermostat (which fails closed), water pump failure, or a split top radiator hose. If you're buying a P38, budget for a full cooling system refresh — radiator, thermostat, hoses and water pump. Keep the coolant system in perfect order and you dramatically reduce the risk of a slipped liner.

Read the full cooling system guide

3. Worn Camshaft & Timing Chain (High-Mileage)

Symptoms: Tappet noise from the top of the engine, loss of power, rough running, poor emissions

Typical mileage: 70,000+ miles

Repair cost: £800–£1,500 (camshaft, lifters, timing chain and sprockets)

Replacement cost: N/A — repair only (does not typically progress to engine replacement)

🟡 Monitor - book inspection soon if tappet noise develops

Our recommendation:

Almost all used Rover V8 engines that have covered over 70,000 miles are suffering or beginning to suffer from worn camshaft, lifters and a stretched timing chain. If you're replacing the camshaft, you should also replace the hydraulic lifters, timing chain and sprockets, and check the rockers and rocker shafts. The timing cover should come off to check the oil pump gears. This is a well-understood job with plenty of specialist support.

Read the full camshaft wear guide → /failures/camshaft-wear-timing-chain/ [NEW FAILURE PAGE NEEDED]

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Range Rover P38 4.0 / 4.6 V8 — Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Range Rover P38 4.0 / 4.6 V8 — Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Can It Be Repaired?

ProblemRepairable?Typical CostWhen It Makes SenseSlipped liner (early detection)⚠️ Sometimes£1,000–£1,200Re-linering is possible but may not be permanentSlipped liner (top-hat solution)✅ Yes£4,000–£7,000The only permanent fix — future-proofs the blockOverheating / cooling system✅ Yes£200–£700Essential maintenance — do it preventativelyWorn camshaft / timing chain✅ Yes£800–£1,500Viable on any well-maintained exampleHead gasket failure✅ Yes£600–£1,200Viable if caught before liner damage occurs

Buying This P38 V8? Check These First

Buy If

Evidence of a top-hat lined replacement engine — this is the gold standard
Full cooling system refresh (radiator, thermostat, hoses, water pump) recently completed
No pressurisation of the cooling system — check by removing the coolant cap when cold
Documented service history with regular oil changes

Avoid If

Pressurised coolant system or bubbling in the expansion tank — this indicates liner failure
Any history of overheating — the damage is often already done
No cooling system maintenance history — this engine is unforgiving of neglect
Tappet noise that hasn't been diagnosed — could indicate worn camshaft

Closing Verdict

The P38 V8 is a genuine character — a Buick-derived aluminium V8 with a wonderful soundtrack and plenty of torque. But it's also one of the most notorious engines for catastrophic failure. The slipped liner issue is real, and the 4.0 is the most prone. The only way to own one with confidence is to buy an example with a top-hat lined engine already fitted, or budget for the work immediately. Without that, you're gambling on a £5,000+ engine replacement. Buy on documented history, not on optimism.

Don't guess.Get the right engine at the right price.

→ Compare P38 4.0 / 4.6 V8 engine prices before you buy

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Buying Checklist

Before you buy a used Range Rover P38 with the 4.0 or 4.6 V8 (or before you commit to an engine replacement), check these:

Coolant System — Check for pressurisation (remove cap when cold); look for bubbling; check for coolant loss

Temperature Gauge — Does it sit steady? Any history of overheating?

Cold Start — Listen for tappet noise or knocking from the top end

Hot Start / Hot Running — Any rattling when hot? This can indicate slipped liners

Service History — Including the V8 engine and confirmed cooling system maintenance

Head Gasket Check — Look for oil in coolant or coolant in oil (mayonnaise on filler cap)

Leaks — Check for oil leaks; they all leak a bit but excessive leaking indicates issues

Top-Hat Evidence — Has the engine been top-hat lined? This is the single most valuable thing to find

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

Engine Codes

This table's rows match Section 1B's Era Map exactly.

42D / 44D (4.0 GEMS)

Years1994–1999

Power190–225 bhp (140–165 kW)

2025 Enquiries— (pattern data)

Avg. Recon Cost£3,000–£5,500 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

42D / 44D (4.0 GEMS)1994–1999190–225 bhp (140–165 kW)— (pattern data)£3,000–£5,500 [PLACEHOLDER]

46D / 48D (4.6 GEMS)1994–1999225 bhp / 380 Nm— (pattern data)£3,000–£5,500 [PLACEHOLDER]

57D / 58D (4.0 THOR)1999–2002185–190 bhp (136–140 kW)— (pattern data)£3,000–£5,500 [PLACEHOLDER]

59D / 60D (4.6 THOR)1999–2002214–218 bhp / 407 Nm— (pattern data)£3,000–£5,500 [PLACEHOLDER]

Technical Specs

Rover V8 4.0 / 4.6

Displacement3,952 cc (4.0) · 4,552 cc (4.6)

Cylinders8-cylinder V8

Bore94.0 mm

Stroke71.0 mm (4.0) · 82.0 mm (4.6)

Cylinder BlockAluminium alloy

Cylinder HeadAluminium alloy

ValvetrainOHV, 2 valves per cylinder (16 valves total)

Compression Ratio8.2:1 (low comp) · 9.35:1 (high comp)

Fuel SystemGEMS (Lucas Sagem) · THOR (Bosch Motronic)

ManagementGEMS (1994–1999) · THOR (1999–2002)

THOR torque advantageMore low-end torque from long inlet runners

GEMS power advantageSlightly higher peak HP

→ Compare P38 4.0 / 4.6 V8 engine prices for your Range Rover

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Market Intelligence

Most Common Failure

Slipped cylinder liners — the defining fault of the P38 V8

Average Enquiry Mileage

70,000

–120,000 miles【PATTERN DATA】

Average Replacement Cost

£4,000

–£5,500 reconditioned, supply only【PLACEHOLDER】

Most Requested Engine Code

4.6

THOR (60D)【PATTERN DATA】

Peak Enquiry Season

Spring / Summer — classic Range Rover owners prepare for overlanding season【PATTERN DATA】

Regional Demand

South East18%

South West15%

London (12%)【PATTERN DATA】

Regional Demand Breakdown

18%South East

FAQ

All prices are indicative UK market ranges based on historical quote data from our network of engine specialists. Actual costs vary by variant, engine code, damage severity and workshop location. Use our free comparison tool to get tailored quotes. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited-mileage warranty — always confirm terms with your chosen supplier.

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12-Month Warranty

As standard

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