CORTECO Harmonic Balancer / Crankshaft Pulley – 80000374 (BMW M47 / N47 Diesel)

Quick Info

OEM-quality harmonic balancer (crankshaft pulley) for BMW 4-cylinder diesel engines.
Designed to absorb crankshaft vibration and drive the auxiliary belt system smoothly.

---

Description

CORTECO 80000374 is a crankshaft pulley with integrated vibration damper used on BMW M47 and N47 diesel engines.

The pulley drives the auxiliary belt system while reducing torsional crankshaft vibration to protect:

• Alternator
• AC compressor
• Power steering system
• Belt drive components

A worn harmonic balancer can wobble, separate or cause auxiliary belt failure.

---

Fitment

BMW Diesel Engines

✔️ M47
✔️ M47N2
✔️ N47
✔️ N47N

❌ Not for M57
❌ Not for N57

---

Common Models

• E46 318d / 320d
• E87 118d / 120d
• E90 / E91 318d / 320d
• F20 118d / 120d
• F30 316d / 320d
• X1 E84 18d / 20d
• X3 F25 20d

---

Part Numbers

• CORTECO: 80000374
• BMW OE references:
  • 11237797895
  • 11237793883
  • 11237805697

---

Technical Details

• Type: Harmonic balancer / crankshaft pulley
• Integrated vibration damper
• Multi-rib auxiliary belt drive
• OEM-quality rubber-metal bonded design

---

Notes

• Common failure item on higher kilometre N47 engines
• Direct OE-style replacement
• Recommended to inspect:
  • auxiliary belt,
  • tensioner,
  • idler pulleys during replacement

---

Important

❗ Not for 6-cylinder M57/N57 engines
❗ Failed dampers can damage the belt system
❗ Always inspect crank pulley alignment during installation

---

Common issues when faulty

• Pulley wobble
• Belt squeal
• Front engine vibration
• Rubber separation
• Auxiliary belt failure