Mercedes Sprinter Rear Crankshaft Seal Cover – Elring | NCV3 3.0L OM642 | #6420100314 (2007–2018)

A leaking rear crankshaft seal cover on a Sprinter OM642 deposits oil on the transmission bellhousing, flywheel, and surrounding components — making it easy to confuse with a transmission leak until the source is properly traced. This is the Elring rear crankshaft seal cover with integrated seal for NCV3 Sprinters equipped with the 3.0L OM642 V6 diesel engine, a complete assembly that restores the sealed rear crankshaft exit and stops oil from migrating toward the drivetrain.

What This Part Does

The rear crankshaft seal cover is a stamped steel retainer plate that mounts to the rear face of the engine block and houses the rear main radial shaft seal. The seal contacts the rotating crankshaft snout as it exits the block toward the flywheel and transmission, preventing engine oil from escaping along the crankshaft axis. On the OM642, the cover is replaced as a complete assembly with the integrated seal — ensuring the sealing bore geometry is correct and eliminating the risk of seal damage during press-fit installation. When the cover warps, cracks, or its integrated seal degrades, oil seeps along the crankshaft and accumulates at the rear of the engine, often appearing first as an oil film on the flywheel or at the transmission bell housing.

Common Symptoms of a Failing Rear Crankshaft Seal Cover

• Oil accumulation at the rear of the engine block or on the transmission bellhousing
• Oil drips under the van concentrated toward the center or rear of the engine undercarriage
• Oil contamination on the flywheel found during clutch or transmission removal
• Gradual oil level drop with no visible leak at the top, sides, or front of the engine
• Oil smell from underneath the van after extended operation

When to Replace

Replace when rear main seal leakage is confirmed and traced to the rear cover location. Most efficiently replaced when the transmission is already removed for clutch, flywheel, flex disc, or torque converter service — the labor to access the cover is largely shared with those jobs.

NCV3 OM642 Specific — VIN Verification Required

This rear crankshaft seal cover is for NCV3 Sprinters equipped with the 3.0L OM642 V6 diesel engine. Always verify your engine code and VIN before ordering. Contact us and we'll confirm fitment before you buy.

Fitment

• 2007–2018 Mercedes-Benz Sprinter 2500 / 3500 – 3.0L OM642 (NCV3/W906)
• 2007–2009 Dodge Sprinter 2500 / 3500 – 3.0L OM642 (NCV3)
• 2007–2018 Freightliner Sprinter 2500 / 3500 – 3.0L OM642 (NCV3)

✔ Replace as a complete assembly — cover and integrated seal together
✔ Most efficiently replaced during transmission-out service

Part Numbers

• Mercedes OEM: 6420100314 / A6420100314 / 642-010-03-14
• Manufacturer: Elring — 685.340
• SKU: 6420100314