Mercedes Sprinter Left Bank Piston Standard 83mm – Kolbenschmidt | NCV3 3.0L OM642 | #6420301517 (2007–2022)

A worn, scored, or damaged piston in the OM642's left bank reduces compression, increases oil consumption, and causes the misfires and power loss that can't be resolved without accessing the bottom end. This is the Kolbenschmidt left bank piston in standard 83mm bore size for NCV3 and VS30 Sprinters equipped with the 3.0L OM642 V6 diesel engine, sold individually for use in cylinders measuring within standard bore dimensions.

What This Part Does

The piston reciprocates within the cylinder bore, sealing the combustion chamber on the compression stroke and transmitting firing load through the connecting rod to the crankshaft on the power stroke. On the OM642 V6, the left bank has three cylinders, each requiring its own specific left-bank piston — not interchangeable with the right bank piston due to the V6's offset geometry. The standard 83mm piston is sized for cylinders at factory bore specification — cylinders that have been bored oversize require the matching oversize piston (642030151754). When a piston shows wear, scoring, or damage, replacement is required along with cylinder honing and new piston rings.

Common Reasons for Piston Replacement

• Cylinder scoring from oil starvation or overheating confirmed during engine teardown
• Piston crown damage from hydraulic lock or detonation
• Ring groove wear beyond specification during engine inspection
• Engine rebuild where pistons show wear beyond service limits

When to Use

Use when cylinders measure within standard 83mm specification. Always measure finished bore diameter and verify piston-to-wall clearance per factory specification before assembly. 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 #6420301217
✔ Standard 83mm — for cylinders at factory bore specification
✔ Sold individually — 3 required for complete left bank rebuild
✔ For oversize bores use #642030151754 (83.5mm)

Part Numbers

• Mercedes OEM: 6420301517 / A6420301517 / 642-030-15-17
• Manufacturer: Kolbenschmidt — 40096600
• SKU: 6420301517