INFINITI 12303-EY00A Crankshaft Pulley Harmonic Balancer G37 Q60 3.7L VQ37 329

( Manufacturer Part Number: 12303-EY00A ), ( Part Type: Crankshaft Balancer ), ( Country Of Origin: Japan )

Review INFINITI G37 Q60 3.7l Crankshaft Pulley Harmonic Balancer #329 fits 2008–2015

The **Infiniti G37/Q60 3.7L VQ37 Engine Crankshaft Pulley & Harmonic Balancer (Part Number: 12303-EY00A, OEM, 2008 2015)** is a precision-engineered component designed to maintain optimal performance and longevity for the iconic 3.7-liter V6 found in select Infiniti models, including the G37 Coupe, G37 Sedan, and Q60 Coupe. This high-quality aftermarket replacement part is meticulously crafted to match the exact specifications of the original equipment manufacturer (OEM) harmonic balancer and crankshaft pulley assembly, ensuring seamless integration with the engine s drivetrain. The pulley features a robust, machined aluminum construction with a precisely balanced rubber insert, which absorbs vibrational forces generated by the crankshaft s rotation, thereby reducing engine noise, harshness, and potential wear on related components. The harmonic balancer is engineered with a reinforced steel core and a high-performance elastomer layer, providing superior durability and resilience against the stresses of high RPM operation, making it ideal for both daily driving and spirited performance applications. This part is designed to fit flawlessly on the front of the VQ37 engine, aligning perfectly with the serpentine belt system and associated accessories, ensuring proper tensioning and alignment for optimal belt life and engine efficiency. Whether replacing a worn or damaged OEM component or upgrading for enhanced performance, this crankshaft pulley and harmonic balancer assembly delivers the reliability and precision expected from Infiniti s high-performance powertrains.

### **Pros and Cons of buying a Infiniti G37 (2008-2015) VQ37 3.7L Crankshaft Pulley/Harmonic Balancer (Part # 12303-EY00A, 08-15, Q60)**

1. **Direct OEM Replacement** This part is a genuine Infiniti factory replacement, ensuring a perfect fit and compatibility with the VQ37 engine. It will match the original specifications, including material, balancing, and mounting dimensions.

2. **Reliability and Durability** Infiniti s OEM components are designed to meet the same quality standards as the original equipment, reducing the risk of premature failure compared to aftermarket knockoffs.

3. **Warranty Coverage** Purchasing from an authorized dealer or a reputable supplier often includes a warranty (typically 12-24 months), providing peace of mind against defects.

4. **Prevents Engine Damage** A failing harmonic balancer can lead to catastrophic engine damage if the crankshaft pulley shatters. Replacing it proactively avoids costly repairs.

5. **Maintains Resale Value** Keeping the vehicle well-maintained with genuine parts helps preserve its value, especially if you plan to sell or trade it in later.

6. **Ease of Installation** Since it s an OEM part, it should align correctly with the engine bay, reducing installation complications compared to aftermarket parts that may require machining or adjustments.

7. **Compatibility with G37 Models** This specific part (12303-EY00A) is designed for the **Q60 (coupe) and G37 (sedan) from 2008-2015**, ensuring it fits without modification.

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1. **Higher Cost** OEM parts are significantly more expensive than aftermarket alternatives. The price for this harmonic balancer can range from **$150 $300 **, depending on the supplier.

2. **Limited Availability** Unlike aftermarket parts, OEM components may not be as widely stocked, especially if purchasing from a non-dealer source. You may need to order it in advance.

3. **Potential Counterfeit Risks** If buying from an unverified seller (e.g., eBay, Craigslist, or unlicensed online marketplaces), there s a risk of receiving a **fake or low-quality part** that could fail prematurely.

4. **Labor Costs** Replacing a harmonic balancer requires removing the timing cover, serpentine belt, and possibly the alternator, which can add **$150 $300 in labor** depending on the shop.

5. **Overkill for Some Owners** If the balancer is still in good condition (no cracks, wobble, or excessive play), replacing it may not be immediately necessary unless you re experiencing symptoms (vibration, rattling, or a loud hum).

6. **Alternative Solutions Exist** Some mechanics recommend **aftermarket high-quality balancers** (e.g., **Fel-Pro, ACDelco, or Koyo**) that offer similar performance at a lower cost while still being reliable.

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- Visible cracks or splits on the rubber cover.

- Excessive wobble when spun by hand.

- Loud humming or rattling from the front of the engine.

- Vibrations felt through the steering wheel or seat.

- **Fel-Pro 80000** or **ACDelco Genuine Parts** High-quality aftermarket options with good reviews.

- **Koyo or NSK** Premium bearings that some mechanics prefer for longevity.

- **Used/Reconditioned** If budget is tight, a **cleaned and inspected used balancer** from a trusted source can be a cost-effective option.

- **Authorized Infiniti Dealers** (most reliable, but pricier).

- **RockAuto, PartsGeek, or eBay (verified sellers)** Check seller ratings and return policies.

- **Local Auto Parts Stores** (AutoZone, O Reilly, NAPA) May carry OEM or high-quality aftermarket.

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Buying the **Infiniti 12303-EY00A OEM harmonic balancer** is the **safest and most reliable choice** if you want a direct factory replacement that ensures longevity and proper fit. However, the **higher cost and potential availability issues** make it less ideal for casual buyers or those on a tight budget.

**If the balancer is visibly failing (cracks, wobble, or noise), replacing it is a wise preventive measure** to avoid engine damage. In that case, **prioritize quality over price** either go with the **OEM part for maximum reliability** or opt for a **trusted aftermarket brand (Fel-Pro, ACDelco, or Koyo)** for a balance of cost and performance.

**If the balancer is still in good condition**, consider **monitoring it further** before replacing, as the cost may not justify the upgrade unless you re experiencing symptoms.

- **Best for Long-Term Reliability:** **Buy the OEM part (12303-EY00A) from an authorized dealer** if budget allows.

- **Best Budget-Friendly Alternative:** **Fel-Pro 80000 or ACDelco Genuine Parts** (aftermarket) from RockAuto or a reputable parts store.

- **Avoid:** Unverified eBay sellers or unknown brands to prevent counterfeit parts.

Would you like guidance on installation tips or additional symptoms to watch for?

Details:

part #: 12303ey00a prices

• $69.95-$330.95

specifications cranshafengin:

• for makes: Infiniti
• for years: 2008-2015
• mpn: 12303-ey00a
• part type: Crankshaft Balancer
• country of origin: Japan

payments cranshafengin:

• wallet: Paypal
• credit card: Mastercard
• other

offer cranshafengin:

• quantity: 1
• started: May 17, 2026
• availability: In Stock
• sold: 0
• options: Ship-to-home

seller cranshafengin:

• city: Opa-Locka, Florida
• # reviews: 12637
• rating: 99.3%

shipping cranshafengin:

• class: Expedited
• transit: 5-11 Days
• cost: $0.00
• type: Fixed
• service: Expedited

returns cranshafengin:

• policy: No Returns

general cranshafengin:

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

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