Timing chain kit M642 for Mercedes-Benz

OE spec timing chain kit, engineered for Mercedes Benz with the OM642, also listed as M642, 3.0 V6 turbo diesel. Restores precise valve timing, quiet starts and reliable performance after chain stretch or guide wear. Sold per kit, variant specific to engine code and year.

What this is / isn’t:
Included: Primary timing chain, fixed and pivot guides, hydraulic tensioner, guide pins or rails, front cover seal or gasket where supplied.

Important: Match by VIN and engine code OM642, M642. Early and late units can use different guide designs, tensioners and chain specs. 4MATIC packaging and emissions equipment can change the part numbers. Always confirm by OE number.

Key Features:

• OE matched geometry: Correct chain pitch and guide profile for accurate cam timing.

• Quiet operation: Hardened pins and low friction guide faces reduce start up rattle.

• Stable tension control: Calibrated hydraulic tensioner maintains chain load across rpm and temperature.

• Leak resistant service: New front cover seal or gasket where supplied helps prevent seepage after reassembly.

• Exact fitment: Direct replacement components for a no mod install when used with factory timing tools.

Compatibility:
Common Mercedes models with OM642 3.0 V6 diesel, confirm by VIN or OE:

• E Class W211, W212 E320 CDI, E350 CDI, E350 BlueTEC

• C Class W204 select markets C320 CDI, C350 CDI

• S Class W221 S320 CDI, S350 BlueTEC

• ML W164, GLE W166 320 CDI, 350 CDI, 350d

• GL X164, GLS X166 320 CDI, 350 CDI, 350d

• GLK X204 350 CDI

• R Class W251 320 CDI, 350 CDI

• G Class W463 G350d

• Sprinter W906 select trims 3.0 V6 CDI
  Drivetrain: 2WD and 4MATIC where applicable. Markets and years vary.

Typical OE reference families, guide only:
A642 050 … timing chain, A642 052 … tensioner, A642 052 … guide sets, with supersessions by year.
Always order by the exact OE part number on your vehicle or confirm via VIN.

When to replace a timing chain kit:

• Rattle at cold start or warm idle, chain slap from the timing cover.

• Fault codes for cam crank correlation, P0016, P0017, or cam adjustment range errors.

• Retarded cam timing on scan data, rough running, poor fuel economy.

• Metal debris in the oil filter, worn guide material found during service.

Installation notes, pro tips:

• Use correct crank and cam locking tools, follow factory timing marks and torque specs.

• Replace one time use fasteners, crank bolt and cam bolts where specified.

• Clean sealing faces, use approved sealant on the front cover, allow proper cure.

• Change engine oil and filter after repair, use Mercedes approved oil, MB 229.x spec.

• Clear adaptations with a scan tool, road test and recheck for leaks or stored faults.

What’s included, not included:
✅ Timing chain, guides and hydraulic tensioner, front cover seal or gasket where supplied
❌ Oil, sealant, crank bolt, cam phasers, water pump, belts, auxiliary hardware unless listed

Q&A
Q1: Will this kit cure the cold start rattle?
Yes, when the cause is chain stretch or worn guides. Correct tensioner fitment and precise timing setup are essential.
Q2: Do I need special tools?
Yes, cam and crank locking tools and a torque angle gauge are required to set timing accurately.
Q3: Can I reuse the crankshaft bolt?
Not advised, it is usually torque to yield. Replace with new where specified.
Q4: Does this fit OM651 four cylinder diesels?
No, OM651 uses different components. Match by VIN and engine code OM642 for this kit.

Why choose TOParts:
OE grade engine kits for Mercedes Benz with precise fitment, correct materials and proven durability, trusted by panel shops and independent Mercedes specialists across South Africa.