SUBARU 12108AB190 Engine Connecting Rod Bearing Set 0.03

( Manufacturer Part Number: 12108AB190 ), ( Country Of Origin: Japan ), ( Type: Connecting Rod Bearing )

Review SUBARU Genuine Oem Engine Connecting Rod Bearing Set Us 0.03

The **Subaru 12108AB190 Engine Connecting Rod Bearing Set (0.03 clearance)** is a precision-engineered aftermarket component designed specifically for high-performance and modified Subaru engines, particularly those featuring the EJ20 or EJ22 series with forged internals or aggressive builds. This meticulously crafted bearing set is engineered to deliver exceptional durability, load-bearing capacity, and thermal stability, making it an ideal choice for enthusiasts pushing their engines beyond stock specifications. Constructed from high-grade **aluminum alloy with a proprietary 0.03-inch (0.762 mm) clearance**, these bearings are optimized to minimize friction while maximizing strength, ensuring reliable operation under extreme conditions whether in high-RPM drag racing, turbocharged applications, or heavy-duty street builds. The **0.03 clearance** is a carefully calibrated specification that balances proper oil film formation with structural integrity, reducing the risk of catastrophic failure while accommodating the increased stresses imposed by forced induction or aggressive camshaft profiles. Each bearing is precision-machined to Subaru s exacting tolerances, featuring a **smooth, uniform surface finish** that enhances oil retention and reduces wear, even under prolonged high-load scenarios. Whether installed in a naturally aspirated engine seeking longevity or a turbocharged setup demanding peak performance, this bearing set provides the critical foundation for smooth, reliable operation. Built to withstand the rigors of modern high-performance driving, the **12108AB190** is a trusted upgrade for those seeking to extend engine life, improve efficiency, and maintain peak mechanical integrity in demanding applications.

### **Pros and Cons of buying a Subaru 12108AB190 Engine Connecting Rod Bearing Set (0.03" Clearance)**

1. **OEM or High-Quality Aftermarket Option** If this part is from a reputable brand (such as **Fel-Pro, Moroso, or a direct Subaru OEM supplier**), it ensures proper fitment, durability, and compatibility with the engine s specifications. OEM parts are designed to match factory tolerances, reducing the risk of premature failure.

2. **Prevents Engine Damage** Worn or seized connecting rod bearings can lead to catastrophic engine failure, including rod knock, piston damage, or even a complete engine wreck. Replacing them as part of routine maintenance or when symptoms (knocking, oil consumption, compression loss) appear helps avoid costly repairs.

3. **Improves Engine Reliability** Fresh bearings reduce friction, allowing the engine to run smoother and more efficiently. This can extend the lifespan of other components, such as crankshafts and pistons, by reducing wear.

4. **Compatibility with Common Modifications** If you ve modified your engine (e.g., forced induction, high RPM tuning), new bearings help maintain structural integrity under increased stress. The **0.03" clearance** is a standard specification for many Subaru engines, ensuring proper lubrication and heat dissipation.

5. **Easier Installation with Proper Tools** Connecting rod bearings are relatively straightforward to replace if you have the right tools (bearing puller, torque wrench, bearing driver, and clean workspace). Many mechanics and DIYers find this job manageable compared to more complex engine rebuilds.

6. **Cost-Effective Compared to Engine Replacement** Replacing bearings is significantly cheaper than rebuilding or replacing an entire engine. For a Subaru with a **FA20, FB20, or FB25 engine**, this part is a relatively low-cost insurance policy against failure.

7. **Warranty Coverage (If Purchased from a Reputable Dealer)** Some aftermarket brands offer warranties, and OEM parts may come with manufacturer guarantees, providing peace of mind against defects.

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1. **Labor-Intensive Installation** Removing and replacing connecting rod bearings requires disassembling the engine, including removing the crankshaft, pistons, and rods. This is a **multi-hour job** that demands mechanical skill, patience, and precision. If you lack experience, hiring a professional mechanic may be necessary, increasing costs.

2. **Risk of Improper Installation** If bearings are not installed correctly (e.g., misaligned, improper torque, or incorrect clearance), they can fail prematurely or cause engine damage. Using the wrong type of bearing (e.g., non-OEM or mismatched part numbers) can also lead to issues.

- **Rod bolts** (if they re worn or stretched)

- **Crankshaft seals**

- **Oil pump kit** (if the engine is being fully rebuilt)

- **Piston rings or cylinders** (if there s significant wear)

These extras can add significant cost to the project.

4. **Potential for Hidden Engine Issues** When disassembling the engine, you may uncover other problems (e.g., cracked pistons, worn crankshaft journals, or oil leaks) that weren t apparent before. Addressing these could turn a simple bearing replacement into a full rebuild.

5. **Time and Downtime** A Subaru engine rebuild or partial disassembly means your car will be out of commission for **several days to a week**, depending on complexity. This is inconvenient if you rely on the vehicle daily.

- **Poor heat dissipation** (risk of overheating)

- **Inconsistent clearance** (if not properly measured)

- **Early failure** under heavy loads

Always verify the brand s reputation before purchasing.

7. **Subaru-Specific Challenges** Some Subaru engines (especially older models) have **unique bearing designs** or tight clearances. Using the wrong part or incorrect installation techniques can lead to issues, particularly in **turbocharged (FB20/FB25) or high-performance applications**.

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Replacing the **Subaru 12108AB190 connecting rod bearing set (0.03" clearance)** is a **wise preventive maintenance measure** if your engine shows signs of wear (knocking, oil consumption, compression loss) or if you re performing a rebuild. The benefits **preventing catastrophic failure, improving reliability, and extending engine life** far outweigh the risks when done correctly.

However, the **labor-intensive nature, potential for hidden issues, and cost of additional parts** make this a job best handled by someone with **mechanical experience or a trusted mechanic**. If you re unsure about your ability to install them properly, **do not attempt it yourself** risking improper fitment could lead to worse problems than the original issue.

For **most average drivers**, this is a **necessary but not frequent** maintenance task. If your engine is running fine, there s no urgent need to replace bearings unless recommended by a mechanic or due to symptoms. But if you re **approaching high mileage (150,000 miles) or modifying your engine**, this is a smart investment in long-term reliability.

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- **Get a professional inspection** before purchasing parts. A mechanic can confirm if bearings are the issue or if other components (crankshaft, pistons, oil pump) need attention.

- **Use OEM or a high-quality aftermarket brand** (e.g., **Fel-Pro, Moroso, or Clevite** for Subaru). Avoid generic or unknown brands.

- **Consider a full engine rebuild** if other components (like the crankshaft) are worn. This may be more cost-effective in the long run.

- **Replace bearings as part of the rebuild**, along with related components (rod bolts, seals, oil pump).

- **Use the correct clearance (0.03")** and ensure proper installation techniques (e.g., cleaning bearing surfaces, using anti-seize on bolts).

- **Document the process** if doing it yourself to avoid mistakes.

- **Leave this job to a professional.** The risk of improper installation is too high for a DIYer unless they have **experience with engine rebuilds**.

- **Get a quote** from a reputable mechanic to compare costs (labor vs. parts).

- **Use aftermarket bearings designed for forced induction** (e.g., **Clevite 222 or Moroso high-performance sets**) if you re running boost.

- **Monitor oil pressure and temperature** more closely, as turbocharged engines place extra stress on bearings.

- Your engine has symptoms of bearing wear.

- You re doing a rebuild and want to ensure longevity.

- You re using a **reputable brand** and have the **skills or access to a mechanic** for proper installation.

- You lack experience with engine disassembly.

- You re unsure about the condition of other engine components.

- You don t have the **time or tools** for a thorough job.

- **For most drivers:** Have a mechanic inspect and replace bearings if needed, using OEM or high-quality aftermarket parts.

- **For enthusiasts:** If you re confident in your skills, proceed carefully, but prioritize **correct clearance, clean installation, and related component checks**.

This part is a **critical but not overly complex** upgrade when done right just ensure you re addressing the **root cause** of any engine issues, not just symptoms.

Details:

Subaru BRZ 2013 -2020. Product Summary: This is a Genuine Subaru Original Part, designed for factory-spec performance and fitment when the correct part number used. Factory Part No. Compatibility for reference: Subaru Ascent 2019 -2021.

Subaru Forester 2014 -2018. Genuine OEM Engine Connecting Rod Bearing set US 0.03 for Subaru 12108AB190: part brand new.

part #: 12108ab190 prices

• $123.00-$134.00

specifications pistonrinro:

• for makes: Subaru
• mpn: 12108ab190
• country of origin: Japan
• type: Connecting Rod Bearing

returns pistonrinro:

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

shipping pistonrinro:

• transit: 3-9 Days
• cost: $0.00
• service: Standard
• class: Standard
• type: Fixed

payments pistonrinro:

• credit card: Discover
• other
• wallet: Google-pay

offer pistonrinro:

• quantity: 2
• started: February 18, 2026
• sold: 0
• options: Ship-to-home
• availability: In Stock

seller pistonrinro:

• rating: 100.0%
• # reviews: 1319
• city: Bensalem, Pennsylvania

general pistonrinro:

• condition: New
• Car Truck Parts Accessories > Engines Engine Parts > Connecting Rods Parts

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