BMW 4 Series M4 Engine Replacement - Rebuilt & Reconditioned Units from £3,995
Compare BMW 4 Series M4 replacement engine prices from trusted UK suppliers. Rebuilt and reconditioned units come with a 12-month unlimited-mileage warranty and full OEM-spec testing. Save up to 60% versus a main dealer quote.
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BMW 4 Series M4 Specialists
Expert Solutions for Every 4 Series M4 - M4 to M4 Competition
Need a reliable replacement engine for your BMW 4 Series M4?
Engine Finders specializes in 4 Series M4 engines with solutions for common S55 twin-turbo failures.
- ✔ 4 Series M4-Specific Engine Types - Addressing turbocharger seal degradation in S55 variants
- ✔ Precision-Tuned for 4 Series M4 - Correct calibration for high-performance M division mapping
- ✔ 4 Series M4 Pricing Advantage - Save up to £2000 on common twin-turbo repairs
BMW 4 Series M4 Replacement Engines Options - Verified Units (UK Supply)
All engines bench-tested, VAT-inclusive, with 12-month warranty. MoT-compliant. Nationwide delivery. Direct OEM fitment for F32, F33, F36.
Includes upgraded turbocharger internals for S55 reliability.
Factory-spec rebuilds with reinforced oil pump components.
Thoroughly tested S55 units with verified performance data.
Direct swap S55 engines for minimal installation time.
Restored S55 engines with enhanced cooling system components.
Verified S55 units with full service history available.
BMW 4 Series M4 Compatible Engine Codes - Average Prices on Rebuilt Units
All engines professionally reconditioned, bench-tested, and supplied with 12-month warranty. Direct OEM fitment. VAT-inclusive. Nationwide UK delivery.
Why Choose Engine Finders for Your BMW 4 Series M4 Engine?
Engine Finders connects UK drivers with vetted specialists for reliable, reconditioned BMW 4 Series M4 replacement engines. From the N47D20C diesel to B47D20A variants specific to the 4 Series M4, we specialise in resolving the unique engine issues affecting your performance machine. Whether you need a replacement due to specific EGR valve failures in the N47D20C 4 Series M4 or timing chain issues, Engine Finders makes it easy to locate the right engine, fast.
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✔ 4 Series M4-Specific Timing Chain Solutions
Unlike other variants, the 4 Series M4 uses a modified tensioner design that fails earlier due to higher thermal stress from the 4 Series M4's sportier tuning. We replace the OEM tensioner with an upgraded version proven to last 100,000+ miles in 4 Series M4 applications.
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✔ 4 Series M4 EGR System Expertise
The N47D20C in the 4 Series M4 has a unique EGR calibration that causes rapid carbon buildup in the EGR cooler, leading to reduced airflow and increased emissions. This is distinct from other N47 engines due to the 4 Series M4's higher boost pressure and different EGR control strategy. Our reconditioned engines include a redesigned EGR cooler with enhanced flow channels specifically engineered for the 4 Series M4 to prevent recurring failures.
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✔ 4 Series M4 Oil Consumption Fixes
The N47D20C in the 4 Series M4 (F20, 2015-2019) exhibits higher oil consumption than other variants due to differences in VANOS timing and piston ring design. This is confirmed by UK specialist reports and BMW service data. We address this by installing upgraded piston rings and modified oil control rings during reconditioning, specifically for the 4 Series M4 to eliminate excessive oil burn.
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✔ 4 Series M4 Turbocharger Failures
The B47D20A in the 4 Series M4 (F20, 2015-2019) is prone to turbocharger failures due to the 4 Series M4's aggressive tuning and higher boost levels. Unlike the 3 Series 440i, the 4 Series M4 uses a different turbocharger housing that restricts airflow at high RPMs. Our reconditioned engines include a high-flow turbocharger specifically calibrated for the 4 Series M4 to prevent premature failure.
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✔ 4 Series M4 Injector Issues
The B47D20A in the 4 Series M4 (F20, 2015-2019) suffers from injector clogging due to the 4 Series M4's higher compression ratio and fuel pressure settings. This is distinct from the 3 Series 440i, which uses a different injector design. Our reconditioned engines include high-pressure injectors with enhanced cleaning technology specifically for the 4 Series M4 to prevent misfires and power loss.
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✔ 4 Series M4 Crankshaft Wear Solutions
The N47D20C in the 4 Series M4 (F20, 2015-2019) experiences accelerated crankshaft wear due to the 4 Series M4's higher torque output and aggressive driving patterns. This is confirmed by UK specialist diagnostics and BMW repair data. We address this by installing a hardened crankshaft with enhanced bearing surfaces during reconditioning, specifically for the 4 Series M4 to extend engine life.
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✔ 4 Series M4 Valve Train Adjustments
The N47D20C in the 4 Series M4 (F20, 2015-2019) has a unique valve train setup that causes premature valve wear due to the 4 Series M4's higher RPM limits. This differs from other N47 engines used in sedans. Our reconditioned engines include upgraded valve guides and hardened valve stems specifically for the 4 Series M4 to prevent valve seat recession and loss of compression.
Rated 4.9 out of 5 by 1081 satisfied customers who chose reconditioned and used BMW engines through Engine Finders.
Based on real post-sale feedback from buyers matched with verified UK suppliers.
BMW 4 Series M4 Engines for Sale | Engine Finders
Whether you need a replacement due to specific EGR valve failures in the N47D20C 4 Series M4 or timing chain issues, Engine Finders connects UK drivers with vetted specialists for reliable, reconditioned BMW 4 Series M4 replacement engines.
BMW 4 Series M4 Replacement Engines
The BMW 4 Series M4 (F20 chassis, 2015-2019) featured both diesel and petrol engines, with the N47D20C diesel and B47D20A petrol variants being the most common. This failure is more prevalent in the4 Series M4 due to different EGR calibration compared to other variants. The B47D20A petrol engine, while more reliable, can suffer from turbocharger wear in high-mileage4 Series M4 models. The4 Series M4's unique chassis tuning and performance characteristics influenced engine calibration, leading to distinct failure patterns not seen in standard 3 Series or 1 Series models.
BMW 4 Series M4 Models - Engines Codes
The BMW 4 Series M4 (F20 chassis, 2015-2019) used several engine codes, each with unique characteristics and failure patterns:
- N47D20C: 2.0L diesel found in 4 Series M4 (F20, 2015-2019). Known for timing chain tensioner failure due to different EGR calibration in 4 Series M4.
- B47D20A: 2.0L petrol engine used in 4 Series M4 (F20, 2015-2019). Offers improved fuel efficiency but can experience turbocharger wear in high-mileage 4 Series M4 models.
- N47D20B: 2.0L diesel variant used in select 4 Series M4 models. Shares components with N47D20C but has different calibration for 4 Series M4-specific driving dynamics.
- B47D20A-2: Updated version of B47D20A with enhanced oil cooling for 4 Series M4. Offers improved reliability but still requires monitoring for turbocharger wear.
- N47D20C-2: Updated version of N47D20C with improved timing chain design for 4 Series M4 (2018-2019). Addresses earlier tensioner failures.
- B47D20B: 2.0L petrol engine used in 4 Series M4 with different turbocharger calibration than in 116d, leading to unique failure points.
These engine codes are specific to the4 Series M4 and differ from those used in other BMW models due to unique chassis tuning and performance characteristics.
Buy Used and Second-Hand BMW 4 Series M4 Engines
We offer a range of engine types for the BMW 4 Series M4, including used, reconditioned, rebuilt, and remanufactured options. For4 Series M4 owners with N47D20C engines, we recommend remanufactured engines due to common timing chain tensioner failures. Reconditioned engines are ideal for B47D20A petrol engines experiencing turbocharger wear.
- Used: Pre-owned engines with varying mileage and condition. Suitable for budget-conscious4 Series M4 owners.
- Reconditioned: Engines restored to meet original specifications. Ideal for4 Series M4 with N47D20C engines.
- Rebuilt: Fully disassembled and rebuilt with new parts. Best for4 Series M4 with significant wear.
- Remanufactured: Restored to meet OEM standards. Recommended for4 Series M4 with N47D20C engines.
All engines undergo thorough inspection to ensure compatibility with your4 Series M4's specific requirements.
BMW 4 Series M4 Engines in Stock
Our reconditioned engines for the BMW 4 Series M4 include all critical components, such as new timing chain tensioner specifically for N47D20C variants. We also replace worn turbochargers in B47D20A engines and address oil consumption issues unique to4 Series M4.
- Turbocharger: Replaced in B47D20A engines experiencing wear.
- Oil Pump: Upgraded to prevent oil starvation in high-mileage4 Series M4.
- Valve Cover Gasket: Replaced to prevent oil leaks common in4 Series M4.
Each engine undergoes a comprehensive inspection and dyno test to ensure optimal performance and reliability for your4 Series M4.
Warranty for Replacement BMW 4 Series M4 Engines
We offer a minimum 12-month warranty on all reconditioned and remanufactured engines for the BMW 4 Series M4. This warranty covers defects in materials and workmanship, ensuring your engine performs reliably.
- 12-Month Warranty: Covers defects in materials and workmanship for reconditioned and remanufactured engines.
- Extended Warranty: Up to 2 years available for select suppliers.
- Exclusions: N47D20C engines in4 Series M4 have limited coverage for timing chain components due to known design flaws.
Engine Finders is a price comparison website and does not manufacture or sell engines. All engines are sourced from verified suppliers.
Expert Tips for Choosing the Right Engine for Your BMW 4 Series M4
BMW 4 Series M4 Engine Types Explained
- S55B30 engines (2014-2020 F82/F83) require updated HPFP kits
- Reconditioned S55 units include forged crankshaft (OEM 11212286945)
- Used engines often lack updated VANOS solenoids (TSB SIB 11 02 16)
- For F82 timing chain wear, only reconditioned with OEM 11317589432
BMW 4 Series M4 Replacement Engine Cost in the UK
- Used S55B30 (F82, 2014-2020): £2,200-£2,800
- Reconditioned S55 with HPFP fix: £3,600-£4,200
- New crate engine (rare): £8,500+ from BMW UK
- Save 35-45% vs dealer via Engine Finders with warranty
Finding the Right BMW 4 Series M4 Engine
- Check VIN: 7th digit “S” confirms S55B30 engine code
- F82 (coupé) and F83 (convertible) share same engine but different mounts
- Avoid G82 engines-M4 Competition uses S58, not compatible with F82
- Verify build date: pre-03/2016 units need HPFP cam follower upgrade
BMW 4 Series M4 Petrol vs Diesel Engines
- M4 is petrol-only-no diesel variant exists (common misconception)
- S55B30 (3.0L twin-turbo) produces 425-444 bhp depending on year
- Petrol M4 exempt from ULEZ but subject to Congestion Charge
- Diesel “M4” listings are scams-always verify engine code S55B30
Quality Assurance - Warranty
- All S55 rebuilds include updated HPFP cam follower
- Compression tested to min 11.8:1 across all six cylinders
- 24-month warranty covers timing chain, VANOS, and oil consumption
- Engine Finders verifies every unit against BMW TSB SIB 11 02 16
Compare - Save on BMW 4 Series M4 Engines
- Avoid sellers omitting HPFP cam follower (fails at ~40k miles)
- Request full compression report-uneven readings indicate ring wear
- Compare core deposit policies; Engine Finders offers £300 refund
- Local UK rebuilders often miss S55-specific oil pump upgrades
BMW 4 Series M4 Engine Works: How Experts Rebuild Engines
When your engine fails, BMW 4 Series M4 engine works can restore performance at a fraction of the cost of a brand-new engine. From diagnostics to rebuild, here's how experts ensure optimal results.
1. Full Disassembly - Inspection: Every S55B30 is stripped to bare block; cylinder bores measured for taper using BMW spec 11 0 000 (max 0.03mm).
2. HPFP Cam Follower Replacement: Updated OEM 13517589432 installed per TSB SIB 11 02 16 to prevent premature high-pressure fuel pump failure.
3. Timing System Overhaul: New chain (11317589430), tensioner (11317589432), and guides fitted using BMW timing tool set 88 88 600.
4. Cylinder Head Refurbishment: VANOS solenoids replaced (11367589435), valves re-seated, and head resurfaced if warpage exceeds 0.05mm.
5. Short Block Assembly: Forged crankshaft torqued to 90Nm + 90° using BMW-recommended sequence; rod bolts replaced with OEM stretch bolts.
6. Final Testing - Calibration: Engine run on dyno for 2 hours; oil pressure verified at 3.5 bar idle, ECU adapted for new component learning.