M272 Engine Timing System Parts 2720505347 For Benz OEM Engine Timing Gear

Product Overview:
The 2720505347 is a genuine Mercedes-Benz OEM timing gear, specifically designed for precise control of engine valve timing. As a core component of the engine timing system, this gear ensures perfect synchronization between the crankshaft and camshaft, guaranteeing efficient and smooth engine operation.

1.Key Advantages

• 100% genuine OEM quality, meeting Mercedes-Benz's stringent testing standards

• Manufactured from special alloy steel with nitriding hardening treatment

• Micron-level machining precision with optimized tooth profile design

• Ultra-quiet operation, effectively reducing engine noise

• Designed service life exceeding 120,000 kilometers

  2. Product Principle

  The timing gear (2720505347) is a critical drivetrain component that synchronizes crankshaft-to-camshaft rotation, ensuring:

  • Precise valve timing (intake/exhaust events)

  • Optimal piston-to-valve clearance

  • Fuel efficiency and emission control
    Engineered with helical gear teeth to reduce backlash noise and distribute load evenly.

  3. Manufacturing Process

  Stage	OEM Production Standards
  Material	Forged 41CrAlMo7 alloy steel (German DIN standard)
  Heat Treat	Gas nitriding (0.3mm surface hardness layer @ 800-1100 HV)
  Machining	CNC ground teeth (DIN 3960 Class 4 accuracy)
  QC Testing	100% magnetic particle inspection for cracks

  4. Installation Notes

  Critical Steps:

  1. Lock crankshaft at TDC (using MB tool #WIS-2720-TDC)

  2. Torque specs:

     • Gear bolt: 90Nm + 90° angle torque

     • Must replace stretch bolts (P/N: A0009903647)

  3. Post-installation:

     • Rotate engine 2 full revolutions by hand

     • Verify timing marks alignment

  Common Mistakes:

  • Reusing old bolts (causes slippage)

  • Skipping cam phaser recalibration

  5. Compatibility (Key Applications)

  Model	Engine	Years	Notes
  C-Class (W204)	M272.910	2007-2014	Non-turbo
  E-Class (W212)	M272.945	2009-2016	REV.≤2012
  GLK (X204)	M272.930	2008-2015	US/EU spec

  VIN Verification Required for:

  • M272 engines after 2011 (revised chain tensioners)

  • AMG variants (different gear ratio)