Subaru OEM Crank Pulley Boss (13-20 BRZ, 15-17 WRX) | 12339AA010

Overview

The Genuine Subaru OEM Crank Pulley Boss (Part #12339AA010) is a precision-engineered factory replacement component for the crankshaft assembly on select Subaru BRZ and WRX models. Designed to exact OEM specifications, this crank pulley boss ensures proper alignment and secure mounting of the crankshaft pulley, maintaining the integrity of your engine's front-end accessory drive system. Ideal for performance enthusiasts and daily drivers alike who demand factory-quality fitment and reliability.

Key Features & Benefits

• Genuine Subaru OEM Part – Manufactured to factory specifications for guaranteed fit, form, and function — no modifications required.
• Exact-Fit Replacement – Engineered specifically for the FA20 engine platform found in the BRZ and WRX, eliminating guesswork and fitment issues.
• Factory-Grade Durability – Built from the same materials and tolerances as the original component to ensure long-lasting performance under demanding conditions.
• Maintains Engine Integrity – Ensures correct crankshaft pulley positioning, protecting belt alignment and preventing premature wear on accessory drive components.
• Backed by Subaru Quality Standards – As a genuine OEM part, this component meets all Subaru engineering and quality control requirements.

What's Included

• 1x Genuine Subaru Crank Pulley Boss (Part #12339AA010)

Specifications

Fitment & Compatibility

This Genuine Subaru Crank Pulley Boss (12339AA010) is compatible with the following vehicles:

Always verify your vehicle's year, model, and trim before ordering. Cross-reference Subaru OEM part number 12339AA010 with your factory parts diagram to confirm fitment.

Installation

The crank pulley boss is an internal engine component associated with the crankshaft pulley assembly. Installation requires removal of the crankshaft pulley and related front engine components. Professional installation by a qualified Subaru technician or experienced mechanic is strongly recommended. Always use a proper torque specification and thread-locking procedures as outlined in the Subaru OEM service manual for your specific vehicle.