MERCEDES A1120350000 Crankshaft Harmonic Balancer Pulley Benz Bolt

( Manufacturer Part Number: A1120350000 ), ( Part Type: Crankshaft Balancer Bolt ), ( Oe/oem Part Number: A1120350600, A1120350400, A1120350500, A1120350900, A1120350800, A1120310071, A0069907104, A0069907004 ), ( Items Included: Bolts ), ( Material: Steel ), ( Vintage Part: No ), ( Finish: Painted ), ( Country Of Origin: Germany )

Review MERCEDES benz Crankshaft Harmonic Balancer Pulley Bolt Oem fits CL500 2004

The **Mercedes-Benz A1120350000 C276 2004 CL500 Crankshaft Harmonic Balancer Pulley Bolt** is a precision-engineered fasteners component designed exclusively for the high-performance M276 V8 engine found in the iconic 2004 Mercedes-Benz CL500 luxury sedan. This bolt plays a critical role in maintaining the structural integrity and dynamic balance of the crankshaft harmonic balancer assembly, ensuring smooth operation and longevity of the engine s power delivery system. Crafted from high-grade **alloy steel**, this bolt is heat-treated to achieve optimal strength and durability, capable of withstanding the extreme stresses and vibrations inherent in high-revving, high-torque applications. The bolt features a **fine-threaded design** with a **12-point drive** for enhanced torque distribution, reducing the risk of stripping and ensuring a secure, vibration-resistant fit. Its **chrome-plated finish** not only resists corrosion but also provides a polished aesthetic that aligns with the premium standards of Mercedes-Benz engineering. This part is a direct OE (Original Equipment) replacement, meticulously engineered to match the original specifications of the CL500 s crankshaft assembly, including precise dimensions, torque specifications, and material composition. Whether used in routine maintenance, engine rebuilds, or performance upgrades, this bolt is essential for preserving the performance, reliability, and resale value of the CL500 s legendary V8 powerplant. Its compatibility extends beyond the 2004 model year, making it a versatile choice for owners of other M276-equipped Mercedes-Benz vehicles, including the SL55 AMG and the C276-based models from the same era. For optimal performance, it is recommended to use a torque wrench to apply the manufacturer-specified torque value, ensuring a snug yet not over-tightened fit to prevent damage to the bolt or surrounding components.

**Pros and Cons of Buying a Replacement Crankshaft Harmonic Balancer Pulley Bolt for a Mercedes-Benz C500 (A1120350000, 2004 Model)**

1. **Prevents Engine Damage** A loose or failing harmonic balancer pulley bolt can lead to excessive vibration, crankshaft damage, or even engine failure if not addressed promptly. Replacing the bolt ensures the balancer remains securely attached, maintaining proper engine function.

2. **Cost-Effective Long-Term Solution** While the bolt itself is relatively inexpensive, replacing it early avoids costly repairs from crankshaft misalignment or bearing wear. This is especially important in high-performance or heavily driven vehicles.

3. **Easy Installation** The bolt is a straightforward part to replace, typically requiring only basic tools (socket wrench, torque wrench, and possibly a puller for the harmonic balancer if it s seized). Many mechanics or even experienced DIYers can complete the job in under an hour.

4. **OEM or High-Quality Aftermarket Options** You can source genuine Mercedes-Benz bolts or reputable aftermarket alternatives (e.g., from brands like Fel-Pro, ACDelco, or local specialty suppliers). These parts are designed to meet or exceed OEM specifications.

5. **Prevents Vibration Issues** A loose bolt can cause excessive vibration, leading to discomfort, drivability problems, or even damage to the engine mounts or transmission. Fixing it early restores smooth operation.

6. **Warranty or Guarantee Coverage** Some aftermarket suppliers offer warranties on their bolts, providing peace of mind against premature failure.

7. **Prevents Further Wear on Related Components** A failing harmonic balancer can stress the crankshaft, bearings, and even the timing system. Replacing the bolt mitigates these risks.

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1. **Potential for Counterfeit Parts** If purchasing online (especially from unverified sellers), there s a risk of receiving substandard or fake bolts that may fail prematurely. Always buy from trusted suppliers or dealerships.

2. **Torque Specifications Must Be Followed** Over-tightening or under-tightening the bolt can cause issues. The correct torque (typically around **100 120 Nm** for the C500) must be applied to avoid stripping the threads or loosening over time.

3. **Harmonic Balancer May Need Replacement** If the balancer itself is worn or cracked, replacing just the bolt won t solve the problem. A visual inspection of the balancer is recommended during installation.

4. **Accessibility Challenges** On some engines, the crankshaft pulley bolt is located in a tight space, making installation difficult without proper tools (e.g., a long breaker bar or extension). This may require disassembling additional components.

5. **Labor Costs if Professional Installation Is Needed** While the part is cheap, labor costs at a dealership or mechanic can range from **$100 $300**, depending on location and shop rates. DIY saves money but requires mechanical skill.

6. **Risk of Reusing Old Bolt (If Possible)** If the bolt was stripped or damaged, reusing it isn t safe. In such cases, you may need to replace the entire pulley assembly, increasing costs.

7. **Limited Lifespan of the Bolt Itself** While high-quality bolts are durable, they are not designed for indefinite use. If the vehicle sees heavy loads or extreme conditions, the bolt may need periodic checks.

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Replacing a loose or failing crankshaft harmonic balancer pulley bolt on a **2004 Mercedes-Benz C500 (A1120350000)** is a **necessary and cost-effective preventive measure** that avoids far more expensive engine damage. The bolt is a critical component for maintaining engine balance, and neglecting it can lead to serious issues.

The **pros outweigh the cons** for most owners, especially when considering the long-term reliability of the engine. The main drawbacks potential counterfeit parts, torque precision, and accessibility can be mitigated by purchasing from reputable sources, following manufacturer torque specs, and ensuring the harmonic balancer is in good condition.

If you re comfortable with basic mechanical work, **DIY replacement is highly recommended** to save labor costs. However, if you lack confidence in your skills or the bolt is part of a larger issue (e.g., a cracked balancer), professional installation is the safer choice.

1. **Purchase from a trusted supplier** Buy the bolt from an **authorized Mercedes-Benz parts dealer, a reputable online retailer (e.g., RockAuto, Amazon with verified sellers), or a local auto parts store with a good return policy**.

2. **Check the harmonic balancer** Inspect it for cracks, excessive wear, or imbalance. If it s damaged, replace the entire assembly.

3. **Use the correct torque specification** Refer to the **Mercedes-Benz service manual** (or a reliable online source) for the exact torque setting (typically **100 120 Nm** for the C500).

4. **Consider a torque converter puller** If the balancer is seized, you may need a **crankshaft pulley puller** to remove it safely.

5. **Document the process** If you re unsure, record the steps or consult a mechanic before starting to avoid mistakes.

6. **Monitor for recurrence** After installation, check the bolt periodically (especially if the vehicle is used for towing or heavy loads) to ensure it remains tight.

**Final Verdict:** **Proceed with replacement** it s a simple, low-cost fix that prevents significant engine problems. Prioritize quality parts and proper installation to ensure longevity.

Details:

SAME-DAY SHIPPING: Purchase before 2PM EST. This item is in full working condition. BEFORE PURCHASE: Get in touch with ANY questions related to item you want purchase. This item was previously used and may show some signs of imperfection.

Paint 1 OBSIDIAN BLACK 197U. Active Body Control ABC. Everything can be resolved. The exact part number match is the only guarantee of fitment.

Interior LEATHER ANTHRACITE 271A. Bi-Xenon high intensity discharge high/low-beam headlamps-inc. Transmission: 7-speed driver-adaptive automatic transmission-inc: touch shift Transmission: 722901 019530.

part #: a1120350000 prices

• $62.40-$62.61

specifications cranshafengin:

• for models: Cl500
• for makes: Mercedes
• for years: 2004
• mpn: A1120350000
• part type: Crankshaft Balancer Bolt
• oe/oem part number: A1120350600, A1120350400, A1120350500, A1120350900, A1120350800, A1120310071, A0069907104, A0069907004
• items included: Bolts
• material: Steel
• vintage part: No
• finish: Painted
• country of origin: Germany

returns cranshafengin:

• paid by: Seller
• time: 60 Days
• policy: Returns Accepted

seller cranshafengin:

• city: Newark, New Jersey
• # reviews: 20654
• rating: 99.7%

payments cranshafengin:

• other
• wallet: Apple-pay
• credit card: Diners-club

general cranshafengin:

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

shipping cranshafengin:

• service: Economy
• cost: $0.00
• class: Economy
• type: Fixed
• transit: 3-6 Days

offer cranshafengin:

• started: May 4, 2026
• options: Ship-to-home
• availability: In Stock
• sold: 0
• best offers: True
• quantity: 1

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