Genuine Subaru Crankshaft Bolt – 12369AA091

FA20 / FB20 / FB25 Engines

The crankshaft bolt is one of the most critical fasteners in your engine — and not one to cheap out on.

This Genuine Subaru crankshaft bolt is designed to apply the correct clamping force to the crank pulley and timing assembly. Proper torque here is essential to prevent pulley movement, belt misalignment, and the wobble issues commonly discussed on FA and FB platforms.

If you’re replacing a pulley, timing components, or chasing unexplained vibration, this is a part that should always be renewed.

Why this bolt matters
On FA20 and FB engines, even slight loss of clamp load can allow the crank pulley to move under load. That movement can show up as visible wobble, belt wear, or noise at idle. Subaru specifies this bolt as a single-use, torque-to-yield fastener — reuse is a gamble.

Details

• Genuine Subaru OEM part

• Part number: 12369AA091

• Designed for correct stretch and torque retention

• Recommended replacement whenever removed

• Helps maintain crank pulley alignment and belt stability

Fitment

• Subaru BRZ ZC

• Subaru Forester SJ

• Subaru WRX VA

• Subaru Levorg VM

• Subaru Impreza GP

• Subaru Liberty BM

• Engines: FA20, FB20, FB25

Roo Racing Tip
If you’re diagnosing crank pulley wobble, belt noise, or doing timing or accessory work — replace the bolt. It’s cheap insurance against expensive problems.