BMW 8 Series 840Ci Engine ReplacementCompare Prices & Get Quotes
Get quotes today from trusted UK BMW 8 Series 840Ci engine specialists. Compare prices on reconditioned, rebuilt and used M60B40 and M62B44 V8 engines for your E31 classic coupe.
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12-Month Warranty
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From £3,000 to £5,000
Used from £1,200 · Reconditioned from £2,200 · Common codes: M60B40, M62B44
From £1,200
Tested, bare/short engine
From £2,200
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
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3 Simple Steps3 Simple Stepsto Finding the Best BMW 8 Series 840Ci Replacement Engineto Finding the Best BMW 8 Series 840Ci Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryBMW 8 Series 840Ci - Engine History & Specs at a Glance
The BMW 840Ci joined the E31 8 Series range in 1993 as the entry-level V8 variant, positioned below the V12-powered 850Ci and 850CSi. Over its seven-year production run, the 840Ci was powered by two generations of BMW V8 - the M60B40 and the later M62B44 - offering smooth, refined V8 power in one of BMW's most iconic grand tourers.
Variant HistoryBMW 8 Series 840Ci - Engine History & Specs at a Glance
The BMW 840Ci joined the E31 8 Series range in 1993 as the entry-level V8 variant, positioned below the V12-powered 850Ci and 850CSi. Over its seven-year production run, the 840Ci was powered by two generations of BMW V8 - the M60B40 and the later M62B44 - offering smooth, refined V8 power in one of BMW's most iconic grand tourers.
BMW 8 Series 840Ci
Fuel TypePetrol
Engine Size Range4.0L-4.4L (3,981-4,398cc)
Power Output Range286hp (210kW) across both engine variantsEngine History Timeline
M60B40 4.0L V8, 286hp (210kW), introduced with the E31 840Ci
M62B44 4.4L V8, 286hp (210kW), replaced M60B40 with updated engine management and improved torque
E31 8 Series production ends; the 840Ci is not carried forward to the E63 6 Series or later generations
Key Specs Snapshot
Fuel TypePetrolEngine Size Range4.0L-4.4L (3,981-4,398cc)Power Output Range286hp (210kW) across both engine variantsTorque Range400Nm (M60B40) to 420Nm (M62B44)Years Produced1993-1999Every engine fitted to the BMW 8 Series 840Ci is covered below, with UK rebuilt pricing and known failure points.
BMW 8 Series 840Ci Engine Codes - Specifications & Replacement CostBMW 8 Series 840Ci Engine Codes - Specifications & Replacement Cost
4.0L V8 (1993-1996)
Power Output286hp (210kW) at 5,800rpmTorque400Nm at 4,500rpmDisplacement3,981ccYears Fitted1993-1996
Compatible Trim Levels
- 840Ci
- 840Ci Sport
- 840Ci Individual
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£1,200-£2,200
Reconditioned
Addressed known issues, tested
£2,200-£3,800
Rebuilt
Full teardown, upgraded internals
£3,000-£5,000
Common Failure
Timing chain tensioner wear is a known issue on the M60B40. The Nikasil cylinder lining can also suffer from degradation on early UK cars run on high-sulphur fuel.
The BMW 8 Series 840Ci is powered by two generations of BMW V8 - the M60B40 (1993-1996) and the M62B44 (1996-1999). While these are renowned for their smooth power delivery and distinctive V8 character, age-related issues are now common on 25-32-year-old examples. Rebuilt 840Ci engines through EnginesMarket include upgraded components addressing the original failure points, plus a minimum 12-month unlimited-mileage warranty.
Why the BMW 8 Series 840Ci M60B40 Rattles
Affected Vehicles
BMW 8 Series 840Ci (M60B40, 1993-1996)
Typical Failure Mileage
80,000-150,000 miles
Root Cause
The M60B40's hydraulic timing chain tensioner can seize or lose tension. This allows the timing chain to slap against the guides, producing a rattling or grinding noise from the front of the engine, particularly on startup or at idle. If left unaddressed, chain guide failure can lead to catastrophic engine damage.
Why It Happens
The M60B40's hydraulic timing chain tensioner can seize or lose tension. This allows the timing chain to slap against the guides, producing a rattling or grinding noise from the front of the engine, particularly on startup or at idle. If left unaddressed, chain guide failure can lead to catastrophic engine damage.
Dealer (parts + labour)
£600-£1,200
Specialist (parts + labour)
£350-£700
What it involves
Replace hydraulic tensioner, inspect chain and guides
Suitability
Effective if caught early; cheapest fix
1 - 2 daysDealer (parts + labour)
£2,000-£3,500
Specialist (parts + labour)
£1,200-£2,200
What it involves
Replace timing chain, guides, tensioners, sprockets
Suitability
Necessary if chain has stretched or guides are worn
1 - 2 daysDealer (parts + labour)
£5,000-£7,500
Specialist (parts + labour)
£3,000-£5,000 (matches Section 4 rebuilt figure)
What it involves
Supply & fit, rebuilt timing system, 12-month warranty
Suitability
Only if chain failure has caused valve/piston damage
1 - 2 daysAll prices are indicative UK market ranges based on current UK specialist supplier data.| Repair Tier | Dealer (Parts + Labour) | Specialist (Parts + Labour) | What It Involves | Suitability | Estimated Time |
|---|---|---|---|---|---|
 Timing chain tensioner replacement Minor | £600-£1,200 | £350-£700 | Replace hydraulic tensioner, inspect chain and guides | Effective if caught early; cheapest fix | 1 - 2 days |
 Timing chain and guide replacement Best Value | £2,000-£3,500 | £1,200-£2,200 | Replace timing chain, guides, tensioners, sprockets | Necessary if chain has stretched or guides are worn | 1 - 2 days |
Full Replacement - rebuilt/reconditioned engine Best Value | £5,000-£7,500 | £3,000-£5,000 (matches Section 4 rebuilt figure) | Supply & fit, rebuilt timing system, 12-month warranty | Only if chain failure has caused valve/piston damage | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical BMW 8 Series 840Ci currently values between £5,000 and £15,000 depending on condition, mileage, and service history. Well-maintained examples with low mileage can command £10,000-£15,000. For sub-£7,000 examples, a used engine or targeted timing chain repair may be more cost-effective. For £7,000+ examples in excellent condition, a rebuilt engine with warranty can be a sensible long-term investment.
Our Recommendation
Our Recommendation
If you hear rattling from the front of the engine on startup, have the timing chain tensioner inspected immediately - a £50-£100 inspection could save you thousands. A tensioner replacement at £350-£700 is the most cost-effective solution. A full chain and guide replacement at £1,200-£2,200 is still significantly cheaper than a full engine rebuild.
Don't Let Engine Failure Write Off Your BMW 8 Series 840Ci
The BMW 8 Series 840Ci is one of the most stylish and desirable grand tourers of the 1990s, powered by two of BMW's finest V8 engines. But at 25-32 years old, timing chain tensioner wear and intake air leaks can catch owners out. A rebuilt 840Ci engine through EnginesMarket comes with upgraded components addressing the original failure points, a minimum 12-month unlimited-mileage warranty, and nationwide delivery or supply & fit options. Compare specialist quotes today - it costs nothing and could save you thousands vs dealer prices.
Compare rebuilt M60B40 BMW 8 Series 840Ci engine prices
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Important Information
BMW 8 Series 840Ci Engine ReplacementFrequently Asked Questions
Question 1How much does a BMW 8 Series 840Ci engine replacement cost-
A BMW 8 Series 840Ci engine replacement typically costs £1,200-£2,200 for a used M60B40 or M62B44 unit, £2,200-£3,800 for a reconditioned engine, and £3,000-£5,000 for a fully rebuilt engine with warranty. Supply & fit adds £650-£910 in specialist labour (10-14 hours).
- Used engines: lowest upfront cost, limited warranty
- Reconditioned: mid-range, some new parts fitted
- Rebuilt: highest cost, fully restored to factory spec with 12-month warranty
Question 2What are the signs of timing chain tensioner failure in a BMW 840Ci (M60B40)-
Common symptoms include a rattling or grinding noise from the front of the engine on cold startup, rough idle, and reduced performance. In advanced cases, the engine may misfire or show timing-related fault codes. If you hear a rattle, have the tensioner inspected immediately - a failed tensioner can allow the chain to slip, causing catastrophic engine damage.
- Rattling on startup: classic symptom
- Rough idle / misfires: chain slack affecting timing
- Engine damage: risk if ignored
Question 3Is it worth replacing the engine in a BMW 8 Series 840Ci-
With average values of £5,000-£15,000, a full rebuilt engine at £3,000-£5,000 represents 20-60% of the vehicle's value. For well-maintained examples worth £10,000+, a rebuilt engine can be a sound investment that preserves the car's value and extends its life by 100,000+ miles.
- Sub-£6,000 car: consider a used engine or targeted repair
- £6,000-£10,000 car: reconditioned engine is viable
- £10,000+ car: rebuilt engine with warranty makes strong financial sense
Question 4How long does a BMW 8 Series 840Ci engine replacement take-
A typical BMW 8 Series 840Ci engine replacement takes 2-5 days for supply and fit at a specialist garage. The M60B40 and M62B44 are V8 engines with good engine bay access on the E31, but the job requires removing the front end and gearbox. Most specialists offer collection/delivery options nationwide.
- Same-day dispatch available for in-stock engines
- Fitting typically completed within 3-5 working days
- Collection/delivery options available across the UK
Question 5What's the difference between the BMW 840Ci and 850Ci engines-
The 840Ci uses a V8 engine (4.0L M60B40 or 4.4L M62B44, 286hp), while the 850Ci uses a V12 engine (5.0L M70B50 or 5.4L M73B54, 326hp). The 840Ci offers better fuel economy and lower running costs, while the 850Ci delivers more power and the unique character of a V12. The 840Ci engine replacement cost is generally lower than the 850Ci's V12.
- 840Ci: V8, 4.0-4.4L, 286hp, 400-420Nm torque
- 850Ci: V12, 5.0-5.4L, 326hp, 490Nm torque
- 840Ci replacement cost: generally lower than 850Ci
Question 6Are BMW 8 Series 840Ci engines reliable-
The M60B40 and M62B44 V8s are generally robust engines, but age-related issues are now common. The M60B40 is known for timing chain tensioner wear and Nikasil cylinder lining issues on early cars. The M62B44 is prone to intake air leaks and oil leaks. Regular maintenance and early diagnosis of symptoms are key to longevity.
- M60B40: timing chain tensioner - inspect at 80,000 miles
- M62B44: intake air leaks - check regularly for rough idle
- Both: oil leaks - common from valve covers and main seals
Why Choose UsCompare BMW 8 Series 840CiEngine PricesToday
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