INA Belt Tensioner Assembly – 531 0783 10 (BMW M47N / M57N)

Quick Info

Genuine INA auxiliary belt tensioner assembly for BMW E-series diesel engines.
Supplied complete with tensioner arm and pulley for the main accessory drive system.

Description

INA 531 0783 10 is a complete mechanical auxiliary belt tensioner assembly used on BMW M47N and M57N diesel engines.

This unit maintains correct belt tension across the accessory drive system and helps ensure smooth operation of:

• Alternator
• Power steering pump
• AC compressor
• Mechanical water pump

INA is the original OEM manufacturer for many BMW belt drive components.

Deep Engine Compatibility Research

After checking OEM cross references and INA catalog data, the correct compatibility is:

BMW Diesel Engines

✔️ M47N
✔️ M47N2
✔️ M57N

⚠️ Some very early M57N2 overlap exists depending on production date and accessory layout.

Specific Engine Variants

✔️ M47TU
✔️ M47TU2
✔️ M57D25TU
✔️ M57D30TU

❌ NOT for:

• N47
• N57
• B47
• B57

BMW later changed the tensioner geometry and belt drive setup on N-series engines.

Common Models

M47 Applications

• E46 318d / 320d
• E87 118d / 120d
• E90 / E91 318d / 320d
• E83 X3 2.0d

M57 Applications

• E46 330d
• E60 / E61 525d / 530d
• E90 / E91 325d / 330d / 335d
• E65 730d
• E53 X5 3.0d
• E83 X3 3.0d

Part Numbers

• INA: 531 0783 10
• BMW OE:
  • 11287807021
  • 11287786881

Equivalent references:

• SKF: VKM 38241
• FEBI: 27372
• SNR: GA350.61

Technical Details

• Type: Mechanical belt tensioner assembly
• Includes: Tensioner arm + pulley
• Pulley diameter: 70mm
• Pulley width: 26mm
• Material: Plastic pulley with alloy tensioner arm
• Automatic spring-loaded tensioner design

Notes

• OEM INA/Schaeffler component
• Common wear item on high kilometre BMW diesels
• Recommended to inspect:
  • auxiliary belt,
  • idler pulley,
  • harmonic balancer during replacement

Important

❗ Not a timing chain tensioner
❗ Not suitable for N47/N57 engines
❗ Incorrect tensioner fitment can cause belt misalignment

Common issues when faulty

• Belt squeal
• Belt vibration
• Tensioner rattle
• Charging faults
• Auxiliary belt failure