BMW 4 Series M4 Convertible Engine Replacement - Rebuilt & Reconditioned Units from £3,995
Compare BMW 4 Series M4 Convertible 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 Convertible Specialists
Expert Solutions for Every 4 Series M4 Convertible - 435i to M4 Convertible
Need a reliable replacement engine for your BMW 4 Series M4 Convertible ?
Engine Finders specializes in 4 Series M4 Convertible engines with solutions for common S55 twin-turbo failures.
- ✔ 4 Series M4 Convertible -Specific Engine Types - Addressing S55 turbocharger and cooling system issues
- ✔ Precision-Tuned for 4 Series M4 Convertible - Correct calibration for twin-turbo performance mapping
- ✔ 4 Series M4 Convertible Pricing Advantage - Save up to £3000 on common S55 engine rebuilds
BMW 4 Series M4 Convertible 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 F82.
High-performance rebuilds with OEM parts, addressing S55 twin-turbo issues.
Fully stripped and rebuilt to factory specs with upgraded S55 internals.
Thoroughly inspected and restored to working condition with turbo upgrades.
Direct swap engines for minimal downtime, compatible with F82 chassis.
Cleaned, tested, and performance-tuned units with reinforced cooling systems.
Affordable options with verified mileage and history, S55 engine provenance.
BMW 4 Series M4 Convertible 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 Convertible Engine?
Engine Finders connects UK drivers with vetted specialists for reliable, reconditioned BMW 4 Series M4 Convertible replacement engines. From the N47D20C diesel to B47D20A variants specific to the 4 Series M4 Convertible, we specialise in resolving the unique engine issues affecting your open-top performance machine. Whether you need a replacement due to specific EGR valve failures in the N47D20C 4 Series M4 Convertible or timing chain issues, Engine Finders makes it easy to locate the right engine, fast.
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✔ 4 Series M4 Convertible -Specific Timing Chain Solutions
The N47D20C in the 4 Series M4 Convertible (F20, 2015-2019) is prone to timing chain tensioner failure due to unique engine management system tuning. Unlike other variants, the 4 Series M4 Convertible uses a modified tensioner design that fails earlier due to higher thermal stress from the 4 Series M4 Convertible 's sportier tuning. We replace the OEM tensioner with an upgraded version proven to last 100,000+ miles in 4 Series M4 Convertible applications.
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✔ 4 Series M4 Convertible EGR System Expertise
The N47D20C in the 4 Series M4 Convertible has a unique EGR calibration that causes rapid carbon buildup in the EGR cooler, leading to reduced airflow and increased emissions. This differs from other N47 engines due to the 4 Series M4 Convertible 's specific tuning for open-top driving. Our reconditioned engines include a redesigned EGR cooler with enhanced flow channels specifically engineered for the 4 Series M4 Convertible to prevent recurring failures.
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✔ 4 Series M4 Convertible Oil Consumption Fixes
The N47D20C in the 4 Series M4 Convertible (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 repair data. We address this by installing upgraded piston rings and modified oil control rings during reconditioning, specifically for the 4 Series M4 Convertible to eliminate excessive oil burn.
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✔ 4 Series M4 Convertible Turbocharger Failures
The B47D20A in the 4 Series M4 Convertible (F20, 2015-2019) is prone to turbocharger and oil consumption issues due to the 4 Series M4 Convertible 's higher boost levels and aggressive driving patterns. Unlike the 3 Series 440i, the 4 Series M4 Convertible uses a different turbocharger housing that restricts airflow at high RPMs. Our reconditioned engines include upgraded turbo components and enhanced oil control rings to address these specific failure patterns.
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✔ 4 Series M4 Convertible Injector Issues
The B47D20A in the 4 Series M4 Convertible (F20, 2015-2019) suffers from injector clogging due to the 4 Series M4 Convertible 's higher compression ratio and fuel pressure settings. This differs 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 Convertible to prevent misfires and power loss.
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✔ 4 Series M4 Convertible Crankshaft Wear Solutions
The N47D20C in the 4 Series M4 Convertible (F20, 2015-2019) experiences accelerated crankshaft wear due to the 4 Series M4 Convertible '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 Convertible to extend engine life.
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✔ 4 Series M4 Convertible Valve Train Adjustments
The N47D20C in the 4 Series M4 Convertible (F20, 2015-2019) has a unique valve train setup that causes premature valve wear due to the 4 Series M4 Convertible '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 Convertible 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 Convertible Engines for Sale | Engine Finders
Whether you need a replacement due to specific EGR valve failures in the N47D20C 4 Series M4 Convertible or timing chain issues, Engine Finders connects UK drivers with vetted specialists for reliable, reconditioned BMW 4 Series M4 Convertible replacement engines.
BMW 4 Series M4 Convertible Replacement Engines
The BMW 4 Series M4 Convertible (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 the 4 Series M4 Convertible due to different EGR calibration compared to other variants. The B47D20A petrol engine, while more reliable, can suffer from turbocharger wear in high-mileage 4 Series M4 Convertible models. The 4 Series M4 Convertible'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 Convertible Models - Engines Codes
The BMW 4 Series M4 Convertible (F20 chassis, 2015-2019) used several engine codes, each with unique characteristics and failure patterns:
- N47D20C: 2.0L diesel found in 4 Series M4 Convertible (F20, 2015-2019). Known for timing chain tensioner failure due to different EGR calibration in 4 Series M4 Convertible.
- B47D20A: 2.0L petrol engine used in 4 Series M4 Convertible (F20, 2015-2019). Offers improved fuel efficiency but can experience turbocharger wear in high-mileage 4 Series M4 Convertible models.
- N47D20B: 2.0L diesel variant used in select 4 Series M4 Convertible models. Shares components with N47D20C but has different calibration for 4 Series M4 Convertible-specific driving dynamics.
- B47D20A-2: Updated version of B47D20A with enhanced oil cooling for 4 Series M4 Convertible. 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 Convertible (2018-2019). Addresses earlier tensioner failures.
- B47D20B: 2.0L petrol engine used in 4 Series M4 Convertible with different turbocharger calibration than in 116d, leading to unique failure points.
These engine codes are specific to the 4 Series M4 Convertible 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 Convertible Engines
We offer a range of engine types for the BMW 4 Series M4 Convertible, including used, reconditioned, rebuilt, and remanufactured options. For 4 Series M4 Convertible 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-conscious 4 Series M4 Convertible owners.
- Reconditioned: Engines restored to meet original specifications. Ideal for 4 Series M4 Convertible with N47D20C engines.
- Rebuilt: Fully disassembled and rebuilt with new parts. Best for 4 Series M4 Convertible with significant wear.
- Remanufactured: Restored to meet OEM standards. Recommended for 4 Series M4 Convertible with N47D20C engines.
All engines undergo thorough inspection to ensure compatibility with your 4 Series M4 Convertible's specific requirements.
BMW 4 Series M4 Convertible Engines in Stock
Our reconditioned engines for the BMW 4 Series M4 Convertible 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 to 4 Series M4 Convertible.
- Turbocharger: Replaced in B47D20A engines experiencing wear.
- Oil Pump: Upgraded to prevent oil starvation in high-mileage 4 Series M4 Convertible.
- Valve Cover Gasket: Replaced to prevent oil leaks common in 4 Series M4 Convertible.
Each engine undergoes a comprehensive inspection and dyno test to ensure optimal performance and reliability for your 4 Series M4 Convertible.
Warranty for Replacement BMW 4 Series M4 Convertible Engines
We offer a minimum 12-month warranty on all reconditioned and remanufactured engines for the BMW 4 Series M4 Convertible. 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 in 4 Series M4 Convertible 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 Convertible
BMW 4 Series M4 Convertible Engine Types Explained
- Used S55 engines from low-mileage 4 Series M4 Convertible with documented service history
- Reconditioned S55 engines with upgraded turbochargers for GTS-specific applications
- Remanufactured S55 engines with reinforced internals for track-focused use
- For 4 Series M4 Convertible with S55B30, remanufactured units address common turbo failures
BMW 4 Series M4 Convertible Replacement Engine Cost in the UK
- Used S55 engines for 4 Series M4 Convertible £4,500-£5,500 depending on condition
- Reconditioned S55 engines cost £6,000-£7,000 with upgraded turbo components
- Remanufactured S55 engines £8,000-£9,500 with full warranty coverage
- Save up to 30% through Engine Finders when replacing 4 Series M4 Convertible S55 engines
Finding the Right BMW 4 Series M4 Convertible Engine
- Check VIN for S55B30 engine code specific to 4 Series M4 Convertible 2014-2016
- F20 chassis codes confirm correct 4 Series M4 Convertible engine compatibility
- Don't confuse standard M4 S55 with GTS-specific calibration requirements
- Verify engine bay configuration matches 4 Series M4 Convertible cooling system
BMW 4 Series M4 Convertible Petrol vs Diesel Engines
- 4 Series M4 Convertible only available with S55B30 petrol engine 2014-2016
- No diesel option available for 4 Series M4 Convertible - all are turbo petrol
- Petrol S55 engines have higher performance but increased maintenance costs
- ULEZ compliant for 4 Series M4 Convertible petrol engines from 2014-2016
Quality Assurance - Warranty
- For 4 Series M4 Convertible S55 engines, turbocharger components are tested for bearing wear
- Intercooler cores checked for GTS-specific cooling system compatibility
- High-pressure fuel pumps tested with OEM 11537509638 specifications
- 12-month warranty covers S55 engine internals for 4 Series M4 Convertible applications
Compare - Save on BMW 4 Series M4 Convertible Engines
- Compare multiple suppliers for 4 Series M4 Convertible S55 engine quotes online
- Avoid suppliers not replacing turbo bearings for S55
- Check if suppliers include ECU programming for 4 Series M4 Convertible calibration
- Look for suppliers with F20-specific 4 Series M4 Convertible installation experience
BMW 4 Series M4 Convertible Engine Works: How Experts Rebuild Engines
When your engine fails, BMW 4 Series M4 Convertible 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. Initial Inspection: Experts examine the S55B30 engine from your 4 Series M4 Convertible using specialized diagnostic equipment to identify specific damage patterns. This includes checking turbocharger bearing wear, intercooler efficiency, and high-pressure fuel system integrity unique to the GTS variant.
2. Disassembly - Cleaning: The 4 Series M4 Convertible S55 engine is carefully disassembled using BMW-specific tools, with all components cleaned and catalogued. Special attention is given to turbocharger housings and intercooler cores that show stress patterns specific to track-focused GTS applications.
3. Component Assessment: Each part from the 4 Series M4 Convertible engine is measured against BMW specifications using precision gauges. Critical components like turbocharger bearings and high-pressure fuel pumps are checked for GTS-specific wear patterns.
4. Replacement Parts Installation: Worn components are replaced with OEM parts specifically for 4 Series M4 Convertible applications. This includes updated turbocharger assemblies, reinforced intercooler cores, and enhanced cooling system components designed for GTS track performance.
5. Reassembly - Torquing: The 4 Series M4 Convertible S55 engine is reassembled using BMW torque specifications and specialized tools. Critical fasteners are torqued to exact specifications (e.g., 25Nm for specific S55 components) with GTS-specific calibration requirements.
6. Testing - Quality Control: Completed 4 Series M4 Convertible engines undergo dyno testing to verify original GTS performance parameters. This includes turbocharger response, intercooler efficiency, and ECU mapping specific to the track-focused S55B30 application.