BMW 1721840 Standard Crankshaft 1.8L 16V M42B18

( Manufacturer Part Number: 1721840 ), ( Part Type: Crankshaft ), ( Material: Cast Iron ), ( Vintage Part: Yes ), ( Universal Fitment: No ), ( Finish: Unfinished ), ( Country Of Origin: Germany ), ( Item Weight: 33 Lb )

Review BMW Standard 1.8l 16v Crankshaft fits E30 318IS 318TI M42 STD

The **BMW E30 318is (1721840) with the M42B18 1.8L 16v engine** is a meticulously crafted example of BMW s mid-1980s engineering brilliance, blending sporty performance, timeless styling, and a reputation for reliability that has earned it a cult following among automotive enthusiasts. This particular model, equipped with the **M42B18 crankshaft standard** variant of the M42 engine, represents the pinnacle of BMW s 16-valve inline-four architecture, delivering a harmonious balance of power, precision, and driving dynamics that define the E30 era. The **318is** designation distinguishes it from its naturally aspirated 318i counterpart, offering a more refined and torque-rich experience thanks to its **170 horsepower** (depending on market specifications) and **113 lb-ft of torque**, all courtesy of the **1.8-liter 16-valve engine**, which features a dual overhead camshaft setup with four valves per cylinder. This design not only enhances breathing efficiency but also contributes to a smoother, more linear power delivery, making it ideal for both spirited driving and daily use.

Under the hood, the **M42B18** engine is a marvel of its time, featuring a forged crankshaft an upgrade over the cast variants found in other E30 models which significantly improves durability and reduces vibration, ensuring a quieter and more refined operation. The engine s **16-valve head** allows for better airflow, supporting the higher performance expectations of the **318is** while maintaining a relatively compact and lightweight package. Paired with a **Getrag five-speed manual transmission** (or optionally an **SMG automatic** in some markets), this setup offers a driving experience that is both engaging and practical, with crisp gear shifts and a responsive throttle that rewards the driver with immediate feedback. The **E30 chassis**, with its **MacPherson struts up front and multi-link suspension at the rear**, provides a well-balanced ride that combines comfort with agility, making it equally capable of handling city streets and winding backroads.

The exterior of the **E30 318is** is a study in BMW s signature design language, characterized by its **aerodynamic yet aggressive stance**, **distinctive kidney grille**, and **sleek, angular bodywork** that sets it apart from its contemporaries. The **1721840 chassis code** indicates a **1987 model year**, placing it squarely in the latter half of the E30 s production run, where BMW had fine-tuned its manufacturing processes and design refinements. Features such as **power windows, central locking, and a tilt steering wheel** (on higher trim levels) enhance convenience without compromising the car s sporty essence. The **interior**, though utilitarian by modern standards, exudes a sense of quality with its **soft-touch plastics, comfortable seats, and intuitive layout**, with the **instrument cluster** offering clear, analog readings that provide immediate feedback on the engine s performance. The **318is** often comes equipped with **sport-tuned suspension** (available as an option), which lowers the car slightly and sharpens its handling, making it a favorite among those who appreciate a more engaged driving experience.

Mechanically, the **E30 318is** is a driver s car at heart, with its **lightweight construction, precise steering, and well-tuned suspension** allowing for a level of control that feels almost modern in its responsiveness. The **M42B18 engine**, when properly maintained, is known for its longevity, with many examples exceeding **200,000 miles** with relatively minor updates primarily focusing on **valvetrain adjustments, timing belt replacements, and cooling system upgrades**. The **crankshaft standard** designation ensures that the engine is built to withstand higher stresses, making it a more robust choice for enthusiasts who plan to push the car further than just daily commuting. Additionally, the **E30 platform** is renowned for its **modularity**, with aftermarket support ranging from **performance upgrades (such as cold air intakes, exhaust systems, and ECU tuning)** to **cosmetic enhancements (custom paint, wheels, and interior refinements)** that allow owners to tailor their 318is to their exact preferences.

Beyond its mechanical and aesthetic merits, the **BMW E30 318is** holds a special place in automotive history as a car that bridged the gap between BMW s early 1980s reliability and its later, more performance-oriented models. It embodies the **perfect blend of practicality and passion**, offering a driving experience that is both accessible and exhilarating. Whether cruising along a coastal highway or navigating a twisty mountain road, this car delivers a sense of **joy and engagement** that is hard to replicate. For collectors, restorers, and drivers alike, the **E30 318is** remains a timeless icon a testament to BMW s ability to create a vehicle that is as much about the soul of driving as it is about the engineering behind it. With its **M42B18 crankshaft standard engine**, this particular example is not just a classic BMW; it is a **well-built, performance-focused machine** that continues to captivate those who appreciate the art of driving.

### **Pros and Cons of Buying a BMW E30 318is (M42B18 1.8L 16V, Standard Crankshaft, VIN 1721840)**

#### **Pros**

1. **Classic E30 Design and Driving Experience**

The E30 318is is one of the most beloved BMWs of all time, known for its timeless styling, nimble handling, and engaging driving dynamics. The M42B18 engine (1.8L inline-4) produces a smooth, linear power delivery, making it enjoyable for both city and highway driving.

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

With proper maintenance regular oil changes, timing belt replacement (if applicable), and attention to suspension components the E30 can last well beyond 200,000 miles. The M42B18 engine is robust and less prone to catastrophic failure compared to some of its contemporaries (e.g., early M50/M52 engines).

3. **Strong Aftermarket Support**

The E30 has a massive aftermarket, meaning parts (from suspension to engine components) are widely available and often affordable. Tuning options (e.g., MHD, MHD2, or even bolt-ons like cold air intakes) can significantly improve performance.

4. **Lower Cost of Ownership (Compared to Modern BMWs)**

Insurance, fuel, and maintenance costs are far lower than those of a modern BMW. Parts are cheap, and labor costs are minimal compared to newer models.

5. **Potential for Modifications**

The E30 platform is highly modifiable from suspension upgrades (coilovers, sway bars) to engine tuning, making it a great project car or daily driver for enthusiasts.

6. **Resale Value (For Classic BMWs)**

While not as high as a M3 or Z3, well-maintained E30s hold value reasonably well, especially in the collector market.

7. **Lightweight and Agile**

The E30 s aluminum body and relatively light weight make it more responsive than heavier modern BMWs, offering a more direct driving feel.

---

#### **Cons**

1. **Aging Suspension and Wear Items**

The stock suspension (especially on higher-mileage examples) can be stiff and worn. Bushings, ball joints, and control arms often need replacement, which can be costly if not addressed early.

2. **Timing Belt and Water Pump Replacement**

The M42B18 does not require a timing belt replacement (it s an interference engine with a chain), but the water pump and tensioner should still be checked periodically. Neglecting these can lead to overheating or coolant leaks.

3. **Rust Concerns (Especially in Snowy Climates)**

The E30 s body panels (especially the lower sections) are prone to rust if not properly maintained. A thorough inspection of the undercarriage, wheel wells, and rocker panels is essential.

4. **Electrical Issues**

Older BMWs are notorious for electrical gremlins failing sensors, intermittent wiring problems, and unreliable gauges. A pre-purchase inspection (PPI) should check for these issues.

5. **Fuel System and Emissions Compliance**

The E30 318is was not originally built for modern emissions standards. If you plan to drive it frequently, you may need to modify the fuel system (e.g., upgrading injectors or adding a tuner) to avoid check engine lights or poor performance.

6. **Limited Modern Safety Features**

Without aftermarket upgrades (e.g., modern ABS, traction control), the E30 lacks modern safety features like stability control or advanced airbag systems.

7. **Maintenance Can Be Labor-Intensive**

While parts are cheap, some repairs (e.g., transmission work, engine rebuilds) require specialized knowledge. If you re not mechanically inclined, costs can add up quickly.

8. **Potential for Hidden Damage**

Many E30s have been in accidents or poorly repaired. A thorough inspection (or a PPI from a trusted mechanic) is crucial to avoid buying a car with structural or frame damage.

---

### **Ending Conclusion**

- **Value classic BMW driving dynamics** and enjoy working on or modifying a project car.

- **Are willing to invest time in maintenance** (oil changes, suspension checks, rust prevention).

- **Prefer a lower-cost alternative** to modern BMWs without sacrificing driving pleasure.

- **Have access to aftermarket support** for parts and tuning.

- **Want a plug-and-play, low-maintenance daily driver** with modern safety and comfort features.

- **Are unwilling to spend money on wear-and-tear items** (suspension, electrical, rust repairs).

- **Plan to drive it heavily without modifications** (fuel system, emissions compliance).

### **Recommendation**

If you find a **well-documented, low-mileage (under 150,000 miles), rust-free, and properly maintained** E30 318is with a **clean service history**, it can be an excellent purchase. **Prioritize:**

- A **pre-purchase inspection** (especially for suspension, electrical, and rust).

- **Budget for upcoming maintenance** (suspension, tires, brakes, fluids).

- **Consider a tune or fuel system upgrade** if you plan to drive it regularly.

For the best experience, pair it with **modern safety upgrades** (ABS, traction control) and **comfort improvements** (sound deadening, better seats) if you intend to use it as a daily.

**Final Verdict:** A **great project car or enthusiast s daily**, but not a hassle-free modern alternative. If you re prepared for the work, it s one of the most rewarding BMWs to own.

Details:

Good to use.

part #: 1721840 prices

• $130.00-$599.99

specifications cranshafengin:

• for models: E30, 318is, 318ti, M42, Std
• for makes: Bmw
• mpn: 1721840
• part type: Crankshaft
• material: Cast Iron
• vintage part: Yes
• universal fitment: No
• finish: Unfinished
• country of origin: Germany
• item weight: 33 Lb

offer cranshafengin:

• availability: In Stock
• options: Ship-to-home
• sold: 0
• quantity: 1
• started: April 2, 2026

general cranshafengin:

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

returns cranshafengin:

• policy: No Returns

shipping cranshafengin:

• cost: $99.99
• transit: 4-8 Days
• class: Standard
• type: Fixed
• service: USPS Ground Advantage
• carrier: USPS

seller cranshafengin:

• city: Portland, Oregon
• rating: 99.7%
• # reviews: 2462

payments cranshafengin:

• money order
• wallet: Paypal
• credit card: Mastercard
• other

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