123031CA0A Nissan PULLEY-CRANKSHAFT, Price: 122.66$, Weight: 4.62kg

Crankshaft Drive Pulley for Nissan/Infiniti ⚙️

This crankshaft pulley is a key engine drive component fitted to the front of the crankshaft. It transfers engine rotation to the auxiliary belt system, helping run the alternator, power steering pump, A/C compressor, and other belt-driven units. A good pulley also helps absorb crankshaft vibration, giving smoother engine operation and longer belt life.

Why This Part Is Needed ?

The engine creates strong twisting pulses every time a cylinder fires. The pulley supports the belt drive and reduces harmful vibration before it reaches other components. Without a solid and balanced pulley, the belt system can become noisy, unstable, and unsafe for daily driving.

How It Works

As the crankshaft turns, the pulley rotates at the same speed and drives the serpentine belt. Its rubber-damped construction helps control vibration and keeps the belt running straight on the grooves. This protects nearby accessories from shock load and helps maintain correct charging, cooling, and cabin comfort performance.

Signs of a Broken Pulley ⚠️

Common Problems

• Squealing or knocking noise from the front of the engine
• Visible wobble while the engine is running
• Cracked rubber damper or separated pulley ring
• Battery warning light due to poor alternator drive
• Loose, jumping, or damaged serpentine belt

If ignored, a failed pulley can throw the belt off, overheat the engine, stop charging the battery, or damage front engine parts.

Compatible Models

• QX70/FX