Engines Market

BMW 524td SPECIALISTS

BMW 5 Series 524td Engine Replacement Compare 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.

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12-Month Warranty
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BMW 5 Series 524td Engine
from£1,800 to £4,500
  • Usedfrom £800
  • Reconditionedfrom £1,800
  • Common codesM21D24
BMW 5-series 524td Used Engine — M21D24BMW 5-seriesUsed Engine — M21D24BMW 5-series 524td Reconditioned Engine — M21D24BMW 5-seriesReconditioned Engine — M21D24BMW 5-series 524td Rebuilt Engine — M21D24BMW 5-seriesRebuilt Engine — M21D24

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How it works

3 Simple Steps to Finding the Right Replacement Engine

Clear information first, then the right engine and specialist for your exact vehicle.

Variant History

BMW 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
  1. 1982

    E28 524td launched with M21D24 2.4-litre turbo-diesel, 115hp, 210Nm torque, Garrett T3 turbocharger

  2. 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

  3. 1989

    Oxidation catalytic converter fitted as standard to improve emissions compliance

  4. 1991

    524td replaced by 525tds with the new M51 2.5-litre diesel engine

Every engine fitted to the BMW 5 Series 524td is covered below, with UK rebuilt pricing and known failure points.

Engine Codes & Pricing

BMW 5 Series 524td Engine Codes Specifications & Replacement Cost

Find your exact engine code, specs and UK replacement cost guide.

M21D24 — 2.4L Turbo-Diesel (1982-1991) engine

M21D24 — 2.4L Turbo-Diesel (1982-1991)

Power Output
115hp (85kW)
Years Fitted
1982-1991 (E28: 1982-1987; E34: 1987-1991)

Can’t find your exact engine code?-> Get quotes for M21D24 BMW 5 Series 524td engine replacement

-> Get quotes for M21D24 BMW 5 Series 524td engine replacement

Common Problems

BMW 5 Series 524td Engine Problems Repair Cost vs Replacement

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.

Common failure points and repair options

Timing Belt Failure

Affected
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.

Repair options

Repair tierDealer priceSpecialist price
Preventative timing belt replacement£600-£1,000£400-£700
Full Replacement - rebuilt/reconditioned engine£5,000-£7,500£3,000-£4,500
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.
-> Compare rebuilt M21D24 BMW 5 Series 524td engine prices

Overheating & Cylinder Head Cracking

Affected
BMW 5 Series 524td (M21D24, all years)
Typical failure mileage
80,000-150,000+ (often age-related)
Root cause
The M21D24's aluminium cylinder head is vulnerable to warping and cracking if the cooling system isn't maintained. Water pump belt failure can cause rapid overheating.

Repair options

Repair tierDealer priceSpecialist price
Cooling system refresh£500-£800£350-£550
Cylinder head repair (cracked/warped)£2,000-£3,500£1,200-£2,500
Full Replacement - rebuilt/reconditioned engine£5,000-£7,500£3,000-£4,500
Our recommendation
Preventative cooling system maintenance is cheap relative to the alternatives. Replace the water pump and belt proactively, and keep the cooling system in good order. If your 524td has overheated, get the head inspected promptly - catching a minor warp early can save the engine. For a car with classic status, a quality rebuild often makes more sense than repeated patch-up repairs.
-> Compare rebuilt M21D24 BMW 5 Series 524td engine prices

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.

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FAQ

BMW 5 Series 524td Engine ReplacementFrequently Asked Questions

Everything BMW 5 Series 524td owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Why Choose Us

Compare BMW 5 Series 524td Engine Prices Today

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.

500+500+ M21D24 engines supplied through our network
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