Mercedes Sprinter Crankshaft Main Bearing Kit – Kolbenschmidt | NCV3 3.0L OM642 | #6420331901KIT (2007–2022)

Worn crankshaft main bearings on a Sprinter OM642 allow the crankshaft to move beyond its designed clearances — producing a deep knock that worsens under load and signals accelerating damage to the journals, bearing saddles, and oil film that keeps the entire bottom end alive. This is the Kolbenschmidt crankshaft main bearing kit in standard size for NCV3 and VS30 Sprinters equipped with the 3.0L OM642 V6 diesel engine, a complete set of upper and lower shells for full main bearing renewal.

What This Part Does

The crankshaft main bearings support the crankshaft at each of its four main journals in the engine block. The OM642 V6 runs on four main bearing journals, each supported by upper and lower shells that form the bearing bore. Oil is fed under pressure through the block's main oil galleries to each bearing, creating the hydrodynamic film that carries full combustion load from the pistons through the connecting rods. When bearing clearances increase from wear, the film thins, pressure drops, and the characteristic deep knock begins. This kit covers both upper and lower shells for all main journal positions.

Common Symptoms of Worn Main Bearings

• Deep, rhythmic knocking from the lower engine present at idle and worsening under load
• Low oil pressure at idle, particularly when hot
• Oil pressure that recovers at higher RPM but drops at idle — a classic bearing clearance symptom
• Metallic particles found in engine oil
• Engine knock that appeared after extended operation with degraded oil

When to Use

Use when main bearing knock is confirmed and crankshaft journal measurements show wear within correctable limits at standard dimensions. Always measure journal diameter and verify clearances with plastigauge before final assembly.

NCV3 & VS30 OM642 Specific — VIN Verification Required

This bearing kit is for NCV3 and VS30 Sprinters equipped with the 3.0L OM642 V6 diesel engine. Always verify your engine code before ordering.

Fitment

• 2007–2018 Mercedes-Benz / Dodge / Freightliner Sprinter 2500 / 3500 – 3.0L OM642 (NCV3)
• 2019–2022 Mercedes-Benz Sprinter 2500 / 3500 – 3.0L OM642 (VS30)

✔ Standard size — for journals measuring within factory specification
✔ Includes upper and lower shells for all main journal positions
✔ Always verify clearances with plastigauge before final assembly

Part Numbers

• Mercedes OEM: 6420331901 / A6420331901 / 642-033-19-01
• Manufacturer: Kolbenschmidt — 77826600
• SKU: 6420331901KIT