SUBARU 57707FN03A Upper Retainer

( Manufacturer Part Number: 57707FN03A ), ( Genuine Oem: Yes ), ( Warranty: 1 Year ), ( Fitment Type: Direct Replacement ), ( Parts Included: Only Part Reference 3 On The Diagram Is Included ), ( Replaces Part Number: 57707fn010 ), ( Placement On Vehicle: Left )

Review SUBARU Genuine Upper Retainer

The **Subaru 57707FN03A Upper Retainer** is a precision-engineered component designed specifically for Subaru s advanced CVT (Continuously Variable Transmission) systems, ensuring seamless power transfer and optimal performance in vehicles equipped with the **Lineartronic** transmission. This high-quality retainer plays a critical role in maintaining the structural integrity and alignment of the transmission s internal components, particularly within the pulley assembly where it secures the tensioner and variator elements. Crafted from durable, heat-resistant materials, the retainer is engineered to withstand the intense pressures and thermal fluctuations inherent in high-performance driving conditions, from spirited acceleration to sustained highway cruising. Its robust construction minimizes wear and tear on adjacent transmission parts, reducing the risk of premature failure and extending the overall lifespan of the CVT system. The **57707FN03A** is meticulously designed to fit flawlessly within Subaru models such as the **Outback, Forester, Legacy, and Crosstrek**, where reliability and efficiency are paramount. Whether installed during routine maintenance or as part of a transmission overhaul, this retainer exemplifies Subaru s commitment to precision engineering, delivering consistent performance and durability for drivers who demand both power and longevity from their vehicles. Proper installation and regular inspection of this component are essential to preserving the transmission s smooth operation and preventing costly repairs down the road.

### Pros and Cons of buying a Subaru 57707FN03A Upper Retainer

#### **Overview**

The **Subaru 57707FN03A** is an **upper retainer** (also called a **valve spring retainer**) for Subaru engines, specifically designed for models with **OHC (Overhead Camshaft) valve trains**, such as the **EJ22/EJ25** series (common in older Subarus like the **Outback, Forester, Legacy, and Impreza**). This part is critical for maintaining proper valve operation and preventing engine damage from valve float or retainer failure.

---

### **Pros of buying a Subaru 57707FN03A Upper Retainer**

1. **Prevents Engine Damage**

- A failing retainer can cause **valve float** (valves not closing properly) or **valve spring collapse**, leading to **piston-valve contact**, which can destroy the engine. Replacing a worn retainer is far cheaper than repairing or replacing an engine.

2. **Improves Engine Performance & Reliability**

- A properly functioning retainer ensures **consistent valve timing**, reducing **misfire, rough idle, or loss of power**. This is especially important in high-performance or heavily modified engines.

3. **OEM Quality (Original Equipment Manufacturer)**

- Subaru s original retainers are built to strict tolerances, ensuring a **snug fit** and **long-lasting durability**. Aftermarket parts may not match this level of precision.

4. **Easy Installation (With Proper Tools)**

- While installation requires **specialized tools** (like a **retainer compressor** and **valve spring compressor**), it is a **manageable DIY job** for those with basic mechanical experience. Many mechanics charge **$100 $300 ** for this service, so buying and installing it yourself saves money.

5. **Widely Available & Affordable**

- This part is **commonly stocked** by auto parts stores (AutoZone, O Reilly, RockAuto) and online retailers (Amazon, eBay, Subaru specialty shops). Prices typically range from **$20 $60**, making it a cost-effective solution.

6. **Prevents Costly Valve Train Issues**

- If a retainer fails, it can **damage valve stems, keepers, or even the camshaft lobes**. Replacing just the retainer is a **preventative measure** that extends the life of other valve train components.

7. **Compatible with Common Subaru Engines**

- This retainer fits **EJ22/EJ25 engines** (found in **1995 2006 Subarus**), which are popular for **turbo builds, swaps, and restorations**. Many aftermarket tuners and builders recommend replacing retainers as part of **valve train upgrades**.

8. **Long Service Life When Properly Installed**

- With **proper lubrication (valve spring oil)** and **correct installation**, a new retainer can last the **entire lifespan of the engine**, especially in **stock or lightly modified applications**.

---

### **Cons of buying a Subaru 57707FN03A Upper Retainer**

1. **Requires Specialized Tools & Mechanical Skill**

- Installing a retainer **without proper tools** (valve spring compressor, retainer compressor, torque wrench) can lead to **damaged valves, springs, or keepers**. Improper installation may also cause **premature wear or failure**.

- If you lack experience, it s easy to **strip threads, bend valves, or forget to lubricate parts**, leading to **recurring issues**.

2. **Potential for Counterfeit or Low-Quality Parts**

- Some **cheap aftermarket or knockoff parts** may not meet Subaru s standards, leading to **early failure or poor fit**. Always buy from **reputable sellers** (official Subaru dealers, trusted online retailers) to avoid this risk.

3. **Labor-Intensive if Not DIY**

- If you **don t perform the installation yourself**, labor costs at a shop can **easily exceed $200 $400**, making the part itself seem less cost-effective. However, this is a **one-time expense** if done correctly.

4. **May Need Additional Valve Train Upgrades**

- If your engine has **high mileage or signs of wear** (e.g., **leaking valve seals, bent valves, or stretched springs**), replacing just the retainer may not be enough. You might also need:

- **New valve springs**

- **New valve keepers**

- **Valve stem seals**

- **Camshaft inspection**

- A **full valve train overhaul** can significantly increase costs.

5. **Risk of Over-Tightening or Under-Tightening**

- **Over-tightening** can **strip the threads** or **damage the retainer s seating surface**.

- **Under-tightening** can cause the retainer to **rattle or fail prematurely**.

- Proper **torque specifications** (typically **15 20 ft-lbs**) must be followed.

6. **Not a Permanent Fix for All Engine Issues**

- If the **valve springs are stretched, the camshaft is worn, or the engine has carbon buildup**, replacing just the retainer won t solve **long-term reliability problems**. A **full valve train service** may be needed.

7. **Potential for Misalignment During Installation**

- If the retainer is **not perfectly aligned** with the valve guides, it can cause **uneven wear** or **premature failure**. This requires **precision installation**.

8. **Time-Consuming Process**

- Removing and reinstalling the **valve cover, camshaft, and rocker arms** takes **several hours**, especially for first-timers. If you re working on an engine for other reasons (e.g., **head replacement, timing belt service**), it may be worth doing it then.

---

### **Conclusion**

The **Subaru 57707FN03A upper retainer** is a **critical and cost-effective** part for maintaining **engine reliability**, especially in **EJ22/EJ25 Subarus**. Its **primary benefit is preventing catastrophic engine damage** from valve float or retainer failure, which can save thousands in repairs.

However, the **main drawbacks** revolve around **installation complexity** it requires **specialized tools, mechanical skill, and precision** to do correctly. If not installed properly, it can **lead to further damage or failure**. Additionally, if the rest of the **valve train is worn**, replacing just the retainer may not be sufficient for long-term reliability.

For **DIY enthusiasts** with **basic mechanical experience**, this is a **great preventative upgrade**. For those **without experience**, hiring a mechanic may be safer (though more expensive). If you re **restoring, modifying, or maintaining an older Subaru**, this part is **highly recommended** as part of a **valve train service**.

---

### **Final Recommendation**

- You **hear a rattling noise** from the valve cover (possible retainer failure).

- You re **doing a valve train service** (spring replacement, keeper upgrade).

- You **plan to modify your engine** (turbo, forced induction) and want to **prevent valve float**.

- You have **basic mechanical skills** and **proper tools** (valve spring compressor, retainer compressor).

- You want to **avoid expensive engine damage** from retainer failure.

- You **lack mechanical experience** and are uncomfortable working on the valve train.

- The rest of your **valve train is severely worn** (springs, keepers, camshaft).

- You **don t have the time** to properly install it (rushing can cause damage).

- You re **on a tight budget** and can t afford the **tools or labor** for proper installation.

- **Buy from a reputable seller** (official Subaru parts, RockAuto, Amazon with good reviews).

- **Replace both retainers** (even if only one is failing) for **symmetrical wear**.

- **Lubricate the retainer and valve springs** with **valve spring oil** during installation.

- **Follow torque specifications** to avoid stripping threads.

- **Consider a full valve train service** if the engine has **high mileage or symptoms of wear**.

This is a **smart, cost-effective upgrade** for **EJ22/EJ25 Subaru owners** who prioritize **engine longevity and reliability**. Just ensure **proper installation** to maximize its benefits.

Details:

Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer. US shipping only, no combined. Sport limited. Parts must be resalable and in the original packaging.

Electrical parts are not returnable.

part #: 57707fn03a prices

• $25.13-$33.45

specifications vintagecarbumperus:

• for makes: Subaru
• mpn: 57707fn03a
• genuine oem: Yes
• warranty: 1 Year
• fitment type: Direct Replacement
• parts included: Only Part Reference 3 On The Diagram Is Included
• replaces part number: 57707fn010
• placement on vehicle: Left

offer vintagecarbumperus:

• sold: 0
• started: May 22, 2026
• quantity: 1
• options: Ship-to-home
• availability: In Stock

seller vintagecarbumperus:

• city: Walnut Creek, California
• # reviews: 1776
• rating: 99.8%

general vintagecarbumperus:

• Exterior Parts Accessories > Bumpers Components > Bumper Inserts Covers
• condition: New

shipping vintagecarbumperus:

• type: Fixed
• cost: $10.99
• service: Standard, Expedited
• transit: 6-12 Days
• class: Standard, Expedited

payments vintagecarbumperus:

• wallet: Apple-pay
• credit card: Visa
• other

returns vintagecarbumperus:

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

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