FORD Harmonic Balancer Sohc 4.0L 309-00558B

( Manufacturer Part Number: 309-00558 ), ( Part Type: Balancer ), ( Stock : Tk591 ), ( Manufacturer Warranty: 1 Month ), ( Material: Cast Iron, Steel )

Review FORD 4.0l Harmonic Balancer Sohc Oem fits EXPLORER 1997–2001

The **Ford 309-00558 Harmonic Balancer** is a critical component designed specifically for the **1997 2001 Ford Explorer** equipped with the **4.0L SOHC (Single Overhead Camshaft) V6 engine**, ensuring smooth operation and longevity of the powertrain. This high-performance harmonic balancer is engineered to absorb and dampen the torsional vibrations generated by the engine s rotating crankshaft, preventing excessive stress on the drivetrain and reducing wear on connected components such as the transmission, flywheel, and universal joint. Crafted from precision-machined steel and reinforced with a durable rubber insert, the balancer is built to withstand the demanding torque and RPM ranges of the 4.0L engine, which is known for its robust yet precise performance in both urban and highway driving conditions.

The **309-00558B** model is a direct replacement part, meticulously designed to match the original equipment manufacturer (OEM) specifications, including the exact bolt pattern, mounting holes, and flange dimensions, ensuring a perfect fit without the need for modifications. Its robust construction minimizes the risk of cracking or deformation under high-speed or heavy-load conditions, which is particularly important for vehicles used in towing, off-roading, or frequent high-RPM driving scenarios. The harmonic balancer s internal rubber core is engineered to maintain optimal flexibility and resilience over time, reducing the transmission of harmful vibrations that could lead to premature wear on the engine s crankshaft or surrounding components.

For Ford Explorer owners seeking a reliable and long-lasting solution to prevent drivetrain fatigue, the **309-00558B** harmonic balancer is an essential upgrade or replacement part. Its compatibility with the **4.0L SOHC V6 engine** commonly found in the 1997 through 2001 model years makes it an ideal choice for restoring or maintaining the smooth operation of the vehicle s powertrain. Whether addressing a failing original balancer or proactively enhancing drivetrain durability, this part is a testament to Ford s engineering standards, offering both performance and longevity for drivers who demand reliability from their vehicles.

### **Pros and Cons of buying a Ford 309-00558 (1997-2001 Explorer 4.0L Harmonic Balancer SOHC)**

1. **Common and Widely Available** The 4.0L V6 engine in the 1997-2001 Ford Explorer is one of the most popular Ford engines, meaning parts like harmonic balancers are easy to find. This reduces the risk of long wait times or difficulty sourcing replacements.

2. **Budget-Friendly Replacement** Compared to some high-performance or modern engine components, the 309-00558 harmonic balancer is relatively inexpensive. Prices typically range from $50 to $150, depending on brand and condition.

3. **Simple Installation** The harmonic balancer is a straightforward component to replace, especially if you have basic mechanical experience. Most DIYers can complete the job in a few hours with the right tools (socket set, torque wrench, and possibly a puller if the old balancer is seized).

4. **Prevents Serious Engine Damage** A failing harmonic balancer can lead to catastrophic engine failure if the internal rubber core disintegrates and damages the crankshaft or other internal components. Replacing it proactively avoids costly repairs.

5. **Aftermarket Options Available** Besides OEM (Original Equipment Manufacturer) parts, there are aftermarket alternatives (e.g., from brands like **Koyo, Gates, or AC Delco**) that may offer better durability or performance at a similar or lower cost.

- A loud **clunking or rattling** noise from the engine bay.

- Vibration or shuddering, especially at idle.

- A **wobbling** motion in the pulleys or accessories.

These signs are clear indicators that replacement is needed.

7. **Long-Term Reliability If Maintained** The 4.0L V6 is a robust engine when properly maintained. With regular oil changes, timing belt/chain inspections, and component replacements (like the harmonic balancer), it can last well beyond 200,000 miles.

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1. **Potential for Counterfeit Parts** Due to the part s popularity, there is a risk of purchasing **fake or low-quality aftermarket balancers**. Cheap knockoffs may fail prematurely, leading to repeated replacements and frustration. Always buy from reputable sellers (e.g., **RockAuto, Amazon, or local auto parts stores with good reviews**).

2. **Risk of Over-Tightening or Under-Tightening** The harmonic balancer bolt (usually a **19mm or 21mm bolt**) must be torqued to the correct specification (typically **80-100 ft-lbs**). Over-tightening can strip the threads, while under-tightening can cause the balancer to loosen and fail.

- Disconnecting the serpentine belt and accessories.

- Removing the crankshaft pulley (may require a **crankshaft pulley bolt remover tool**).

- Ensuring the engine is properly supported (jack stands or a hoist).

If you re not comfortable with engine work, this job may require a mechanic.

4. **Timing Belt/Chain Replacement Often Required** If the harmonic balancer is being replaced due to **advanced engine wear**, it s often a good idea to also inspect and replace the **timing belt/chain and water pump** (if applicable). This adds to the cost and labor time but prevents future issues.

5. **Potential for Hidden Damage** If the balancer has been failing for some time, the **crankshaft pulley or adjacent components** (like the alternator or power steering pump mounts) may have been damaged by vibration. A thorough inspection is recommended before installation.

6. **Mixed Reviews on Aftermarket Balancers** While some aftermarket brands (e.g., **Koyo**) are highly rated, others may have inconsistent quality. OEM or **Gates** balancers are often considered the most reliable but may cost slightly more.

7. **Noise from Other Sources** If the clunking noise isn t solely from the harmonic balancer, you might waste time and money replacing it only to discover another issue (e.g., **rod bearings, exhaust manifold bolts, or a failing flexplate**).

---

Replacing the **Ford 309-00558 harmonic balancer** on a **1997-2001 Explorer 4.0L SOHC** is a **practical and cost-effective** way to prevent engine damage. The part is **affordable, widely available, and relatively easy to install**, making it a **DIY-friendly repair** for most mechanics or enthusiasts. However, **quality control is critical** purchasing a **reputable aftermarket or OEM part** ensures longevity and avoids premature failure.

If you re **not comfortable with engine work**, it s best to have a mechanic perform the replacement, especially if other components (like the timing belt) need attention. **Regular maintenance** (oil changes, belt inspections) will extend the life of the engine and reduce the likelihood of harmonic balancer failure.

- **Buy from a trusted source** (e.g., **RockAuto, Amazon, or a local auto parts store with good reviews**) to avoid counterfeit parts.

- **Consider an OEM or high-quality aftermarket balancer** (e.g., **Gates, Koyo, or AC Delco**) for better durability.

- **Inspect the crankshaft pulley and surrounding components** before installation to ensure no hidden damage exists.

- **Torque the bolt correctly** (80-100 ft-lbs) to prevent stripping or loosening.

- **If the engine has high mileage**, pair this repair with a **timing belt/chain and water pump replacement** if due.

- **Document the noise** (video or audio) before replacement to confirm the issue is indeed the harmonic balancer.

**Final Verdict:** **Worth replacing** if symptoms are present, as it s a **preventative measure** that avoids far more expensive engine damage. For most drivers, this is a **straightforward and necessary repair** rather than an optional upgrade.

Details:

Its a real easy process. Paint color may be different then what it appears in photos. You might need to get the item repaired, sanded, primed and/or painted. All damage is shown in pictures.

PLEASE SEE ALL PICTURES: Unless stated otherwise all our body parts are used and may have some damage, scuff sand scratches. Also, make sure to compare this item with yours before buying as well please do your research will fit vehicle. Model: FORD EXPLORER.

part #: 30900558 prices

• $24.99-$71.44

specifications cranshafengin:

• for models: Explorer
• for makes: Ford
• for years: 1997-2001
• mpn: 309-00558
• part type: Balancer
• stock : Tk591
• manufacturer warranty: 1 Month
• material: Cast Iron, Steel

returns cranshafengin:

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

offer cranshafengin:

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

shipping cranshafengin:

• cost: $0.00
• carrier: UPS
• type: Fixed
• class: Standard
• service: UPS Ground
• transit: 3-7 Days

general cranshafengin:

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

payments cranshafengin:

• wallet: Paypal
• credit card: Discover
• other

seller cranshafengin:

• city: Winston-Salem, North Carolina
• rating: 99.5%
• # reviews: 909

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