Mercedes Sprinter Crankshaft Main Bearing Kit 0.50mm Oversize – Kolbenschmidt | NCV3 3.0L OM642 | #6420331901KIT050 (2007–2022)

When the OM642's crankshaft journals require more material removal than a 0.25mm grind can address — due to severe scoring, deep grooves, or significant out-of-round wear — the journals must be precision-ground to 0.50mm undersize, and the bearing shells must match. This is the Kolbenschmidt crankshaft main bearing kit in 0.50mm oversize for NCV3 and VS30 Sprinters equipped with the 3.0L OM642 V6, for use after crankshaft main journals have been precision-ground 0.50mm undersize.

What This Part Does

The 0.50mm oversize shells are the second-step grind option when 0.25mm undersize still leaves the journal surface below specification. They feature an even thicker backing that precisely compensates for the additional material removed at the 0.50mm grind depth, restoring the correct oil film clearance on the deeper-reground journals. This is the maximum standard grind option for OM642 main journals — if the crankshaft cannot be restored to a true surface at this grind depth, crankshaft replacement is required.

Common Reasons for 0.50mm Oversize Selection

• Crankshaft journals with deep scoring or severe out-of-round that cannot be corrected at 0.25mm
• Previous rebuild with 0.25mm undersize bearings showing accelerated wear
• Journal diameter measured at or below 0.25mm undersize specification after inspection

When to Use

Use only after crankshaft main journals have been precision-ground 0.50mm undersize. Always confirm journal diameter with a micrometer before ordering and verify clearances with plastigauge before final assembly.

NCV3 & VS30 OM642 Specific — Engine 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)

✔ 0.50mm oversize — maximum standard grind option
✔ Always verify journal diameter with micrometer and confirm clearances with plastigauge

Part Numbers

• Mercedes OEM: 6420331901 / A6420331901 / 642-033-19-01
• Manufacturer: Kolbenschmidt
• SKU: 6420331901KIT050