Mercedes Sprinter Left Bank Piston 83.5mm Oversize – Kolbenschmidt | NCV3 3.0L OM642 | #642030151754 (2007–2022)

When the OM642's left bank cylinder bores have been worn beyond standard tolerance and precision-bored to 83.5mm, standard-size pistons will not maintain the correct running clearance — an oversize piston matched to the machined bore is required. This is the Kolbenschmidt left 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 left bank cylinders have been bored to 83.5mm.

What This Part Does

The piston reciprocates within the cylinder bore, compressing the air charge on the compression stroke and transmitting combustion force through the connecting rod to the crankshaft on the power stroke. The OM642 V6's left bank has three cylinders, each requiring its own piston. The "54" suffix and "15" in the part number 642030151754 indicate this is a left-bank specific piston — not interchangeable with the right bank piston (642030121754) due to the V6's offset cylinder bank geometry. Oversize pistons are dimensioned to restore the correct running clearance after cylinders have been bored to remove wear, scoring, or out-of-round damage.

Common Reasons for Oversize Piston Selection

• Left bank cylinders bored to 83.5mm during engine rebuild
• Cylinder scoring or wear that required machining beyond honing to correct
• Engine rebuild after oil starvation or overheating damage to the left bank

When to Use

Use only after left bank cylinders have been precision-bored to 83.5mm. Always verify finished bore diameter and piston-to-wall clearance per factory specification. Order 3 units for a complete left bank rebuild.

NCV3 & VS30 OM642 Specific — Engine Verification Required

This piston is for the left 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 left bank (NCV3)
• 2019–2022 Mercedes-Benz Sprinter 2500 / 3500 – 3.0L OM642 left bank (VS30)

✔ Left bank only — right bank requires #642030121754
✔ 83.5mm oversize — for use only after cylinders bored to 83.5mm
✔ Sold individually — 3 required for complete left bank rebuild
✔ Always verify bore diameter and piston-to-wall clearance before assembly

Part Numbers

• Mercedes OEM: 642030151754 / 6420301517 / 642-030-15-17
• Manufacturer: Kolbenschmidt — 40096630
• SKU: 642030151754