Mercedes Sprinter Crankshaft Main Bearing Set 0.25mm Oversize – Mahle | T1N OM612 / OM647 | #MS2248P (2001–2006)

When a T1N Sprinter's crankshaft journals show wear beyond standard clearances and require grinding to restore a true, round surface, standard-size bearings will not restore proper oil film clearance — and running undersize journals with standard shells is the fastest way to destroy a freshly rebuilt bottom end. This is the Mahle crankshaft main bearing set in 0.25mm oversize for T1N Sprinters equipped with the OM612 or OM647 5-cylinder diesel engine, for use after crankshaft journals have been precision-ground 0.25mm undersize.

What This Part Does

The crankshaft main bearing set consists of the upper and lower bearing shells that support the crankshaft at each main journal in the engine block. The bearings maintain a precise oil film clearance between the crankshaft and the bearing bore — this hydrodynamic film is the only thing separating the spinning crankshaft from the bearing material under full combustion load. When crankshaft journals develop scoring, taper, or out-of-round wear that places them outside standard tolerances, the journals must be ground to an undersize dimension to restore a true, smooth surface. The 0.25mm oversize shells are dimensioned with a thicker backing to compensate for the material removed during grinding, restoring the correct oil clearance on reground journals. Mahle is a leading OEM engine component supplier and the MS2248P set is manufactured to the tri-metal construction specification required for diesel engine service life under sustained high-load operation.

Common Reasons for Undersize Bearing Selection

• Crankshaft journals found scored, tapered, or out-of-round during engine teardown
• Main bearing knock confirmed and journals measured below standard specification
• Engine rebuild where crankshaft has been sent out for precision grinding to 0.25mm undersize
• Standard-size bearings showing accelerated wear patterns indicating the journals are no longer true

When to Use

Use when crankshaft main journals have been precision-ground 0.25mm undersize and confirm journal diameter with a micrometer before selecting bearing size. Always verify clearances with plastigauge after installation — do not assume ground journals are exactly 0.25mm undersize without measurement. If journals require removal beyond 0.25mm, the 0.50mm set is the next option.

T1N OM612 / OM647 Specific — Engine Verification Required

This bearing set is for T1N Sprinters equipped with the 2.7L OM612 or OM647 5-cylinder diesel engine. It is not compatible with NCV3 Sprinters equipped with the 3.0L OM642 V6 or 2.1L OM651, or VS30 Sprinters. Always verify your engine code before ordering.

Fitment

• 2001–2006 Mercedes-Benz Sprinter 2500 – OM612 / OM647 5-cylinder diesel (T1N)
• 2001–2006 Mercedes-Benz Sprinter 3500 – OM612 / OM647 5-cylinder diesel (T1N)
• 2003–2006 Dodge Sprinter 2500 / 3500 – OM612 / OM647 5-cylinder diesel (T1N)

✔ 0.25mm oversize — for use only after crankshaft journals have been precision-ground
✔ Always verify journal diameter with micrometer and confirm clearances with plastigauge
✔ Replace connecting rod bearings at the same time during any bottom-end rebuild

Part Numbers

• Manufacturer: Mahle — MS2248P25MM
• SKU: 602030204025