BMW 7846605 Engine Crankshaft Crank 3.0L

( Manufacturer Part Number: 7846605 ), ( Part Type: Engine Crankshaft Crank ), ( Country Of Origin: Germany )

Review BMW Oem 3.0l Engine Crankshaft Crank fits M4 M3 M2 F80 F82 F83 F87 S55 2015–2020

The **BMW 7846605** is a precision-engineered crankshaft designed specifically for the high-performance **3.0-liter S55 inline-six engine** found in BMW s legendary **F80 (M4), F82 (M4 Competition), F83 (M4 CSL), and F87 (M4 GTS)** models, as well as the **F87 M3 (GTS)** and **F80/F82/F83 M3 (CSL)** variants produced between **2015 and 2020**. This crankshaft is a critical component of the S55 s robust architecture, built to withstand the extreme demands of **500 horsepower** and **450 lb-ft of torque**, all while maintaining razor-sharp responsiveness and durability. Crafted from **high-grade forged steel** with a **nitrogen-alloyed surface treatment**, the crankshaft features **five main journals** and **seven counterweights**, meticulously balanced to minimize vibration and ensure smooth operation under full-throttle conditions. The **precision-machined crankpins** are designed to handle the immense lateral forces generated by the S55 s **double overhead camshaft (DOHC) 24-valve cylinder heads**, while the **integrated oil passages** facilitate optimal lubrication, reducing wear and extending engine life. Whether installed in a **street-legal M4 or M3**, a **track-focused CSL**, or a **high-revving GTS**, this crankshaft is engineered to deliver **uncompromising performance, reliability, and longevity**, making it an essential part of BMW s most exhilarating naturally aspirated powerplants.

### **Pros and Cons of Buying a BMW with the N63 (3.0L S55 Engine) from 2015 2020 (F80/F82/F83/F87 M4, M3, M2, and S55-Powered Models)**

The **N63 S55** is BMW s twin-turbocharged V8 engine, originally developed for the **M5 (F90)**, but later adapted for performance variants of the **M4 (F82), M3 (F80), M2 (F87), and even some S55-powered non-M models**. Below is a detailed breakdown of its strengths and weaknesses, followed by a conclusion and recommendation.

---

### **Pros**

1. **Exceptional Power and Performance**

- The **N63 S55** produces **400 500 horsepower** (depending on tuning and model) with **450 550 lb-ft of torque**, making it one of the most powerful naturally aspirated V8s in BMW s lineup.

- **0-60 mph in 3.5 4.5 seconds** in M4/M3 models (stock or lightly tuned).

- **Redline at 7,500 RPM**, allowing for high-revving, driver-engaging performance.

- **Direct injection and twin turbos** provide quick spool and strong mid-range power.

2. **Durability and Reliability (When Maintained Properly)**

- The **N63 S55 is a refined evolution** of the older N57/N63 engines, with **improved oil control rings, better turbo matching, and a more robust crankshaft**.

- **Less prone to catastrophic failure** compared to earlier N57/N63 variants, though **oil consumption and turbo longevity** remain concerns.

- **Strong aftermarket support** parts like turbos, injectors, and ECUs are widely available.

3. **Driving Experience and Sound**

- **Throttle response is linear and aggressive**, making it highly engaging for performance driving.

- **V8 sound is deep, growling, and satisfying**, especially in the M4/M3 models.

- **Smooth power delivery** (compared to earlier BMW V8s) due to better turbo sequencing and tuning.

4. **Potential for High Power with Mods**

- **Stock power is already strong**, but the engine **handles forced induction well** (up to **600 HP** with proper tuning).

- **Turbo upgrades** (e.g., Garrett GTX, BorgWarner)

- **Injector upgrades** (e.g., Delphi 640cc or 800cc)

- **ECU tuning** (MHD, JB4, or custom maps)

- **Exhaust upgrades** (for better flow and sound)

- **Crankshaft and block strength** allow for **significant power increases** without major structural concerns.

5. **M-Specific Refinements (M4/M3/M2 Models)**

- **M4 (F82) and M3 (F80) with N63 S55** come with **M-specific suspension, brakes, and gearbox**, enhancing track performance.

- **M2 (F87) with N63 S55** (2020 ) is a **lightweight, rear-wheel-drive hot hatch** with **M-tuned handling**.

- **Better cooling systems** (larger radiators, intercoolers) compared to non-M variants.

6. **Resale Value (Compared to Other BMWs)**

- **M models (especially M4/M3) hold value well** due to their performance reputation.

- **Non-M N63 models (e.g., 550i, 750i) are less desirable** but still offer strong power.

---

### **Cons**

1. **Oil Consumption (Major Weakness)**

- The **N63 S55 is notorious for burning oil**, especially in **higher-mileage examples**.

- **Blue smoke from exhaust** (indicating burnt oil).

- **Low oil levels** despite regular top-ups.

- **Carbon buildup** in combustion chambers (can lead to misfires).

- **Solution:** Regular **oil changes (every 3,000 5,000 miles)**, using **high-quality synthetic oil (e.g., Motul, Liqui Moly)**, and **checking for leaks**.

2. **Turbo and Valvetronic Issues**

- **Turbo wastegates and seals can wear out**, leading to **boost leaks or reduced efficiency**.

- **Valvetronic actuators** (electronic throttle) can **fail or stick**, causing **rough idle or power loss**.

- **Solution:** **Regular turbo inspections**, **upgraded turbos** (if pushing power), and **replacing faulty actuators**.

3. **Carbon Buildup and Misfires**

- **Direct injection leads to carbon deposits** on intake valves, especially in **high-mileage or poorly maintained engines**.

- **Symptoms:** **Misfires, rough idle, loss of power**.

- **Solution:** **Carbon cleaning (intake valve cleaning) every 50,000 70,000 miles**.

4. **Transmission Wear (Especially in M Models)**

- **M models (M4/M3) come with the 8-speed ZF transmission**, which is **strong but not indestructible**.

- **Clutch wear** (especially in manual M2/M3).

- **Shift solenoids failing** (leading to rough shifts).

- **Fluid degradation** (must be changed every **60,000 miles**).

- **Solution:** **Regular transmission fluid changes**, **avoiding aggressive shifting**.

5. **Cost of Maintenance and Repairs**

- **BMW dealership labor is expensive**, and **OEM parts are costly**.

- **Turbo replacement ( $3,000 $5,000)**.

- **Injector replacement ( $1,500 $2,500)**.

- **Carbon cleaning ( $500 $1,000)**.

- **Transmission rebuild ( $3,000 $5,000)**.

- **Aftermarket parts can reduce costs**, but **quality varies**.

6. **Electrical and Software Quirks**

- **N63 engines are controlled by complex ECUs**, which can **glitch or require updates**.

- **Check engine lights (CEL) for minor codes** (often fixable with software updates).

- **Sensor failures** (e.g., MAF, crankshaft position sensor).

- **Solution:** **Regular diagnostics (OBD-II scanner) and ECU updates**.

7. **Weight and Fuel Economy**

- **V8 engines are heavy**, affecting **handling and fuel efficiency**.

- **MPG is poor ( 12 15 city, 18 22 highway)** compared to smaller engines.

- **Solution:** **If fuel economy is a concern, consider an M2 (F87) with its AWD system for better traction**.

8. **Potential for Overheating**

- **The N63 S55 generates a lot of heat**, especially under heavy loads.

- **Coolant leaks** (hose failures).

- **Thermostat failures**.

- **Radiator or water pump issues**.

- **Solution:** **Regular coolant system checks**, **upgraded hoses**, and **proper cooling upgrades** if modifying.

---

### **Conclusion**

The **N63 S55 is one of BMW s most capable V8 engines**, offering **exceptional power, driving dynamics, and mod potential**. However, it comes with **significant maintenance challenges**, particularly **oil consumption, turbo longevity, and carbon buildup**.

- **Enthusiasts who prioritize performance and are willing to maintain the engine.**

- **Those who enjoy the sound and feel of a high-revving V8.**

- **Buyers who plan to **modify** the car (turbo upgrades, tuning, exhaust).

- **Owners who can afford **regular oil changes, turbo inspections, and potential carbon cleaning**.

- **Casual drivers who want a low-maintenance luxury car.**

- **Those who dislike **oil checks and potential smoke issues**.

- **Budget-conscious buyers** (repairs can add up quickly).

- **People who prioritize **fuel efficiency** over power.

---

### **Recommendation**

1. **Buy from a Reputable Seller**

- **Avoid high-mileage examples (over 80,000 miles)** unless you re prepared for **oil consumption and carbon issues**.

- **Check service records** look for **regular oil changes, turbo inspections, and carbon cleanings**.

- **Get a pre-purchase inspection (PPI)** from a **BMW specialist

Details:

May be a little dusty from storage use and have few minor scratches. Please review all the pictures and read carefully. Please be 100% sure this is the correct part for your vehicle. FOR SALE IS: crankshaft PART NUMBER: FITS: BMW M3 F80, This is an original part oem, not aftermarket.

part #: 7846605 prices

• $1336.58-$2216.38

specifications cranshafengin:

• for models: M4, M3, M2, F80, F82, F83, F87, S55
• for makes: Bmw
• for years: 2015-2020
• mpn: 7846605
• part type: Engine Crankshaft Crank
• country of origin: Germany

payments cranshafengin:

• wallet: Apple-pay
• other
• credit card: Mastercard

shipping cranshafengin:

• cost: $120.00
• transit: 3-8 Days
• service: USPS Ground Advantage
• class: Standard
• type: Fixed
• carrier: USPS

general cranshafengin:

• Car Truck Parts Accessories > Engines Engine Parts > Crankshafts
• condition: Used

offer cranshafengin:

• options: Ship-to-home
• best offers: True
• started: March 25, 2026
• availability: In Stock
• sold: 0
• quantity: 1

seller cranshafengin:

• # reviews: 6139
• city: Rancho Cordova, California
• rating: 97.4%

returns cranshafengin:

• paid by: Buyer
• time: 30 Days
• policy: Returns Accepted

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