Mercedes Sprinter Right Bank Piston 83.5mm Oversize – Kolbenschmidt | NCV3 3.0L OM642 | #642030121754 (2007–2022)

When the OM642's right bank cylinder bores have been worn beyond their standard tolerance and require precision boring to restore a true, round surface, standard-size pistons will not seal correctly in the enlarged bore — an oversized piston matched to the machined bore is required. This is the Kolbenschmidt right bank piston in 83.5mm oversize for NCV3 and VS30 Sprinters equipped with the 3.0L OM642 V6 diesel engine, sold individually for use after right bank cylinders have been bored to 83.5mm.

What This Part Does

The piston is the reciprocating component that travels up and down within each cylinder bore, compressing the air-fuel mixture on the compression stroke and transmitting combustion force to the connecting rod and crankshaft on the power stroke. On the OM642 V6, the right bank has three cylinders — each requiring its own piston. The piston's diameter must precisely match the cylinder bore to maintain the correct running clearance for the piston rings to seal effectively while allowing the piston to move freely without binding. The "54" suffix in the part number 642030121754 indicates this is a right-bank specific piston — the OM642's V6 layout means the right and left bank pistons are not interchangeable. When cylinder bores are worn oval, tapered, or scored beyond standard clearance and are bored to 83.5mm, these matching 83.5mm oversize pistons restore the correct running clearance.

Common Reasons for Oversize Piston Selection

• Right bank cylinders bored to 83.5mm during engine rebuild to restore round, true bore surfaces
• Cylinder scoring or wear that could not be corrected by honing alone
• Engine rebuild where standard-size pistons would leave insufficient clearance in a worn bore

When to Use

Use only after right bank cylinders have been precision-bored to 83.5mm. Always measure finished bore diameter and verify piston-to-wall clearance per factory specification before assembly. The OM642 right bank requires 3 pistons — order 3 units for a complete right bank rebuild.

NCV3 & VS30 OM642 Specific — Engine Verification Required

This piston is for the right bank of NCV3 and VS30 Sprinters equipped with the 3.0L OM642 V6 diesel engine. Always verify your engine code and bore size before ordering.

Fitment

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

✔ Right bank only — left bank requires #642030151754
✔ 83.5mm oversize — for use only after cylinders bored to 83.5mm
✔ Sold individually — 3 required for complete right bank rebuild
✔ Always verify bore diameter and piston-to-wall clearance before assembly

Part Numbers

• Mercedes OEM: 642030121754 / 6420301217 / 642-030-12-17
• Manufacturer: Kolbenschmidt — 40095630
• SKU: 642030121754