BMW 5 Series 524td Engine ReplacementCompare Prices & Get Quotes
Get quotes today from trusted UK BMW 5 Series 524td engine specialists. Compare prices on reconditioned, rebuilt and used M21D24 engines for your E28 or E34 524td with our free, no-obligation quote comparison.
Supply & Fit Available
12-Month Warranty
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100+ Suppliers
From £1,800 to £4,500
Used from £800 · Reconditioned from £1,800 · Common codes: M21D24
From £800
Tested, bare/short engine
From £1,800
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 5 Series 524td Replacement Engineto Finding the Best BMW 5 Series 524td Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryBMW 5 Series 524td - Engine History & Specs at a Glance
The BMW 524td made history in 1983 as BMW's first-ever production diesel car, proving that diesel power could be smooth, refined and genuinely enjoyable to drive. The M21 turbo-diesel engine powered two generations of 5 Series, the E28 (1982-1987) and E34 (1987-1991), before being replaced by the more advanced M51 diesel family.
Variant HistoryBMW 5 Series 524td - Engine History & Specs at a Glance
The BMW 524td made history in 1983 as BMW's first-ever production diesel car, proving that diesel power could be smooth, refined and genuinely enjoyable to drive. The M21 turbo-diesel engine powered two generations of 5 Series, the E28 (1982-1987) and E34 (1987-1991), before being replaced by the more advanced M51 diesel family.
BMW 5 Series 524td
Fuel TypeDiesel
Engine Size Range2.4L (2443cc)
Power Output Range115hp (85kW) across both generationsEngine History Timeline
**1982** - E28 524td launched with M21D24 2.4-litre turbo-diesel 115hp, 210Nm torque, Garrett T3 turbocharger
**1987** - E34 524td introduced carrying over the M21D24 engine but with a smaller turbocharger for improved responsiveness and Bosch EDC electronic diesel control - a world first
**1989** - Oxidation catalytic converter fitted as standard to improve emissions compliance
**1991** - 524td replaced by 525tds with the new M51 2.5-litre diesel engine
Key Specs Snapshot
Fuel TypeDieselEngine Size Range2.4L (2443cc)Power Output Range115hp (85kW) across both generationsYears Produced1982-1991Every engine fitted to the BMW 5 Series 524td is covered below, with UK rebuilt pricing and known failure points.
BMW 5 Series 524td Engine Codes - Specifications & Replacement CostBMW 5 Series 524td Engine Codes - Specifications & Replacement Cost
2.4L Turbo-Diesel (1982-1991)
Power Output115hp (85kW)Years Fitted1982-1991 (E28: 1982-1987; E34: 1987-1991)
Compatible Trim Levels
- 524td
- 524td Automatic
- 524td (E28)
- 524td (E34)
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£800-£1,800
Reconditioned
Addressed known issues, tested
£1,800-£3,200
Rebuilt
Full teardown, upgraded internals
£3,000-£4,500
Common Failure
The M21D24's aluminium cylinder head is prone to warping and cracking if the cooling system is neglected. Timing belt replacement is critical - BMW recommends replacement every 40,000km (approx. 25,000 miles) or by time, as belts degrade with age.
The BMW 524td's M21D24 is a generally robust engine, but age and mileage bring specific challenges. Timing belt failure and cooling system neglect are the two biggest threats to the 524td's 2.4-litre turbo-diesel. Rebuilt M21D24 engines through EnginesMarket include upgraded components addressing these failure points, plus a minimum 12-month unlimited-mileage warranty.
Why the BMW 5 Series 524td M21D24 Needs Regular Belt Changes
Affected Vehicles
BMW 5 Series 524td (M21D24, 1982-1991)
Typical Failure Mileage
25,000-40,000 miles or 5-7 years
Root Cause
The M21D24 is an interference engine - if the timing belt breaks, pistons collide with valves, causing catastrophic internal damage. Belts degrade with age as well as mileage, making regular replacement essential.
Why It Happens
The M21D24 is an interference engine - if the timing belt breaks, pistons collide with valves, causing catastrophic internal damage. Belts degrade with age as well as mileage, making regular replacement essential.
Dealer (parts + labour)
£600-£1,000
Specialist (parts + labour)
£400-£700
What it involves
New timing belt, tensioner, and water pump (while accessible)
Suitability
Essential maintenance every 25k-40k miles - the cheapest option by far
1 - 2 daysDealer (parts + labour)
£5,000-£7,500
Specialist (parts + labour)
£3,000-£4,500
What it involves
Supply & fit, upgraded components, 12-month warranty
Suitability
When belt has failed or head is cracked/warped
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 |
|---|---|---|---|---|---|
 Preventative timing belt replacement Minor | £600-£1,000 | £400-£700 | New timing belt, tensioner, and water pump (while accessible) | Essential maintenance every 25k-40k miles - the cheapest option by far | 1 - 2 days |
 Full Replacement - rebuilt/reconditioned engine Best Value | £5,000-£7,500 | £3,000-£4,500 | Supply & fit, upgraded components, 12-month warranty | When belt has failed or head is cracked/warped | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical E28 524td (1982-1987) in average condition is worth roughly £2,000-£6,000; the E34 524td (1987-1991) typically sits in the £3,000-£8,000 bracket [THIRD-PARTY]. If you're facing a full rebuilt engine at £3,000-£4,500 plus fitting, the replacement cost may approach or exceed 60% of a lower-value E28's market value. For E34 examples and well-maintained E28s, the maths is more favourable.
Our Recommendation
Our Recommendation
If your 524td's timing belt is overdue - and you don't know when it was last changed - replace it immediately. This is the single most cost-effective preventative measure you can take. If the belt has already failed or the aluminium head has cracked from overheating, a rebuilt M21D24 with warranty is the sensible route. Given the 524td's growing classic status, many owners choose to invest in a quality rebuild rather than scrap a historic BMW.
Don't Let Engine Failure Write Off Your BMW 5 Series 524td
The M21D24 is a historic engine - BMW's first production diesel and a genuine piece of automotive heritage. Whether you're facing timing belt failure, a cracked head, or simply planning ahead, EnginesMarket connects you with UK specialists who understand these engines. Every rebuilt 524td engine comes with upgraded components addressing the original failure points, a minimum 12-month warranty, and nationwide delivery options.
Compare rebuilt M21D24 BMW 5 Series 524td engine prices
12-Month Minimum
UK Specialists Vetted
Best Price GuidanceImportant Information
Important Information
"All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EnginesMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific BMW 5 Series 524td. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
BMW 5 Series 524td Engine ReplacementFrequently Asked Questions
Question 1How much does a BMW 5 Series 524td engine replacement cost in the UK-
A rebuilt M21D24 engine for a BMW 524td typically costs £3,000-£4,500 supply-only, with used units from £800 and reconditioned from £1,800. Fitting adds approximately 10-14 hours of labour at specialist rates.
- **Used engine:** £800-£1,800 - budget option, variable condition
- **Reconditioned:** £1,800-£3,200 - bench-tested and wear parts replaced
- **Rebuilt:** £3,000-£4,500 - full strip and rebuild with warranty
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Question 2What are the signs of timing belt failure in a BMW 524td-
The M21D24 uses a timing belt, not a chain. Warning signs include a ticking noise from the front of the engine, difficulty starting, or visible cracking on the belt itself during inspection.
- BMW recommends replacement every 40,000km (approx. 25,000 miles)
- Belts degrade with age as well as mileage
- The 524td is an interference engine - if the belt breaks, valves and pistons collide
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Question 3Is it worth replacing the engine in a BMW 524td-
The 524td is BMW's first production diesel and has genuine classic status. An E28 524td in good condition is worth £2,000-£6,000; an E34 524td £3,000-£8,000. If your car is solid and the replacement cost (£3,000-£4,500) makes financial sense, many owners choose to invest.
- Well-maintained 524td values are appreciating as classics
- A rebuilt M21D24 with warranty can outlast the original
- Evaluate scrap value first if the car has significant other issues
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Question 4How long does a BMW 524td engine replacement take-
A typical BMW 524td engine replacement takes 2-3 days for a specialist workshop, including removal, fitting, and testing. Supply-only delivery is usually 1-3 working days.
- Most UK specialists can complete the job within a week
- Complexities like turbocharger re-fitting or EDC system setup (E34 models) may add time
- Always confirm turnaround with your chosen supplier
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Question 5What's the difference between the E28 and E34 BMW 524td engines-
Both generations use the same M21D24 2.4-litre turbo-diesel with 115hp. The E34 version (1987-1991) received a smaller turbocharger for improved responsiveness and Bosch EDC electronic diesel control - a world-first innovation.
- **E28 524td (1982-1987):** BMW's first diesel, Garrett T3 turbo
- **E34 524td (1987-1991):** Improved turbo response, Bosch EDC, oxidation cat from 1989
- Both are 2.4L inline-six, 115hp, 85kW
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Question 6What warranty comes with a BMW 524td replacement engine-
Every rebuilt or reconditioned BMW 524td engine supplied through EnginesMarket carries a minimum 12-month unlimited-mileage warranty. Some suppliers offer extended coverage on premium rebuilds.
- 12 months is the minimum - many specialists offer 24 months
- Supply-only and supply & fit both carry warranty
- Always confirm exact terms with your chosen supplier
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Comparing BMW 5 Series 524td engine quotes is free and carries no obligation. Whether you need a used M21D24 to keep your classic on the road, or a fully rebuilt unit with warranty for peace of mind, EnginesMarket connects you with vetted UK specialists who know the 524td inside out. Enter your registration above and get tailored quotes for your exact 524td and engine code today.
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