1. Engine Crankshafts Products
  2. sku: 18900569959307604
  3. TOYOTA 1340750091

TOYOTA Crankshaft Pulley Harmonic Balancer 4.7L 13407-50091

fits model: 4runner. make: Toyota. year: 2003–2009.

13407-50091 Toyota 1340750091 2003-2009 4runner Crankshaft Pulley Harmonic Balancer 4.7l

( Manufacturer Part Number: 1340750091 ), ( Part Type: Crankshaft Balancer ), ( Manufacturer Warranty: 1 Month ), ( Material: Steel )

Review TOYOTA Crankshaft Pulley Harmonic Balancer 4.7l fits 4RUNNER 2003–2009

The **Toyota 1340750091 Crankshaft Pulley (Harmonic Balancer)** for the **4.7L V8 engine** found in the **2003 2009 Toyota 4Runner** is a precision-engineered component designed to maintain smooth engine operation while absorbing vibrations generated by the crankshaft s rotational motion. This high-performance balancer is crafted from durable **cast iron** and features a **precision-machined rubber insert** that dynamically compensates for minor imbalances, reducing harshness and prolonging the lifespan of critical drivetrain components. The pulley s **serrated teeth** ensure a secure fit on the crankshaft, while its **integrated bolt pattern** (compatible with the stock 4Runner s crankshaft flange) guarantees a seamless installation. Built to withstand the demands of off-road and high-torque applications, this balancer is engineered to resist cracking, warping, or premature wear, even under extreme operating conditions. Whether you're tackling rugged terrain or pushing the limits of your vehicle s performance, this **OEM-quality replacement** delivers the reliability and durability expected from Toyota s legendary engineering. Proper installation requires the use of a **new crankshaft bolt** and **torque specification adherence** to prevent future alignment issues, ensuring optimal engine performance and longevity.

**Pros and Cons of buying a Toyota 1340750091 (2003-2009 4Runner Crankshaft Pulley/Harmonic Balancer for 4.7L Engine)**

### **Pros:**

1. **Direct Fitment** This part is specifically designed for the 2003 2009 Toyota 4Runner with the 4.7L V8 engine, ensuring compatibility without modifications.

2. **Reliability** Toyota s harmonic balancers are generally built to withstand the stresses of a high-torque engine like the 4.7L, reducing the risk of premature failure if installed correctly.

3. **Prevents Engine Damage** A failing harmonic balancer can lead to catastrophic engine damage (e.g., bent crankshaft, rod bearing failure) if it shatters. Replacing it proactively avoids costly repairs.

4. **Aftermarket vs. OEM Choice** If purchasing from a reputable brand (e.g., ACDelco, Gates, or Toyota genuine), you get a high-quality alternative that matches or exceeds OEM standards.

5. **Ease of Installation** The part is straightforward to replace, requiring only basic tools (socket set, torque wrench, and possibly a puller for stubborn bolts).

6. **Cost-Effective Maintenance** At around **$50 $150** (depending on brand and source), it s a relatively inexpensive part compared to engine repairs it prevents.

7. **Improved Vibration Damping** A worn balancer can cause excessive vibration, which this replacement helps mitigate, improving ride comfort and reducing stress on the drivetrain.

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### **Cons:**

1. **Potential for Counterfeit Parts** Purchasing from untrusted sellers (e.g., eBay, Craigslist, or unknown online marketplaces) risks receiving a fake or low-quality part that fails quickly.

2. **Labor Intensity** While not extremely difficult, removing the harmonic balancer requires disconnecting the serpentine belt, timing belt (if applicable), and possibly the crankshaft pulley, which can take **1 3 hours** for a DIYer.

3. **Risk of Over-Tightening** The crankshaft pulley bolts must be torqued to **spec (80 90 ft-lbs for the 4.7L)**. Over-tightening can strip threads or damage the crankshaft flange.

4. **Timing Belt Replacement Consideration** If the timing belt is worn (common in high-mileage 4Runners), it should be replaced simultaneously to avoid future timing issues. This adds cost ( $200 $400).

5. **Balancer Wear Indicators** Some balancers show signs of wear (cracks, oil leaks, or excessive play) before failure. If the old one was neglected, the new one may not last as long if the engine has other underlying issues (e.g., oil sludge, rod bearing wear).

6. **Limited Lifespan** While durable, harmonic balancers typically last **100,000 150,000 miles** before needing replacement, especially in severe conditions (towing, off-roading, or poor maintenance).

7. **Misalignment Risk** If the crankshaft pulley is not properly aligned during reinstallation, it can cause belt tensioner or water pump wear.

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### **Conclusion:**

The **Toyota 1340750091 harmonic balancer (or a high-quality aftermarket equivalent)** is a **necessary and cost-effective preventive maintenance item** for the 2003 2009 4Runner s 4.7L engine. The risks (mostly related to installation or part quality) are outweighed by the benefits of avoiding a **$3,000 engine rebuild** from a failed balancer. However, the replacement should be done **with care**, using the correct torque specs and considering related components like the timing belt if they re worn.

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### **Recommendation:**

1. **Source the Part Carefully** Buy from **Toyota dealerships, reputable auto parts stores (RockAuto, Advance Auto, or local shops with return policies), or trusted online sellers** (e.g., Amazon, eBay with verified feedback). Avoid suspiciously cheap deals.

2. **Choose a Quality Alternative** If opting for aftermarket, select brands like **Gates, ACDelco, or Spectron** for reliability. These often match or exceed OEM quality.

3. **Inspect the Old Balancer** Before purchasing, check the existing balancer for **cracks, oil leaks, or excessive play** (wiggle it with a pry bar). If it s already failing, prioritize replacement.

4. **Replace Related Components** If the **timing belt, tensioner, or idlers** show signs of wear, replace them at the same time to avoid future issues.

5. **Follow Installation Steps Precisely**

- Use a **crankshaft pulley bolt hole aligner** (or a dowel pin) to ensure proper alignment.

- Torque the bolts to **80 90 ft-lbs** (do not exceed).

- Reinstall the **serpentine belt** with the correct tension and routing.

6. **Consider Professional Help if Unsure** If you re not comfortable with engine work, a **mechanic ( $150 $300 labor)** can ensure a clean installation.

7. **Monitor for Issues Post-Installation** Listen for **unusual noises** (clunks, rattles) or **vibration** during acceleration, which could indicate improper installation or another underlying problem.

**Final Verdict:** **Worth the purchase and replacement** if done correctly. The **long-term savings and engine protection** far outweigh the cost and effort. Treat it as a **routine maintenance item** alongside oil changes and belt inspections.

Details:

All electronics are tested before removed from vehicle. Shipping prices for ground apply only to the continental USA. For local orders, pay on pickup available. Item condition: The item is in good condition, fully operational, and demonstrates normal signs of use.

part #: 1340750091 prices

  • $80.10-$162.43

specifications cranshafengin:

  • for models: 4runner
  • for makes: Toyota
  • for years: 2003-2009
  • mpn: 1340750091
  • part type: Crankshaft Balancer
  • manufacturer warranty: 1 Month
  • material: Steel

general cranshafengin:

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

returns cranshafengin:

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

seller cranshafengin:

  • rating: 100.0%
  • city: Rancho Cordova, California
  • # reviews: 4417

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shipping cranshafengin:

  • type: Fixed
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  • transit: 3-7 Days
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offer cranshafengin:

  • options: Ship-to-home
  • availability: In Stock
  • quantity: 1
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  • best offers: True
  • started: February 17, 2026
for models: 4runner, for makes: toyota, for years: 2003-2009, part type: crankshaft balancer, manufacturer warranty: 1 month,
category: auto parts > car truck parts accessories > engines engine parts > crankshafts, material: steel, sku: 18900569959307604,
Toyota 1340750091 Is Similar To:
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