Cummins engine crankshaft , Iran

The Cummins engine crankshaft is manufactured from forged alloy steel grade 4340 or 1541. Induction hardening heat treatment of the journals raises surface hardness to 55 to 60 HRC. The main journal diameter in the 6BT model equals 76.2 millimeters and in the NTA855 model equals 88.9 millimeters. The connecting rod journal diameter in the 6BT series measures 63.5 millimeters and in the KTA19 series measures 76.2 millimeters. The distance between journal centers (stroke) in the 6BT series is approximately 120 millimeters. This value increases to 152 millimeters in the NTA855 series and to 159 millimeters in the KTA19 series. The babbit layer thickness on original bearings is 0.5 millimeters with pressure tolerance of 180 bar. In marine applications, journals are nickel-plated to withstand salt corrosion. Generator applications require a wider thrust washer with 6 millimeters thickness.

The Cummins crankshaft is machined with six counterweights to eliminate torsional vibration. The total crankshaft bending tolerance under standard conditions is below 0.05 millimeters per meter length. Roundness tolerance for main and connecting rod journals is 0.005 and 0.008 millimeters respectively. Journal surface roughness after polishing reaches below 0.1 micrometers Ra. Dynamic balancing is performed at 1000 to 3000 RPM to eliminate mass imbalance. The maximum allowable imbalance in construction machinery series is 15 gram-centimeters. This value decreases to 8 gram-centimeters in marine series for reduced vibration. Connecting rod journals feature oil holes with diameter of 8 to 10 millimeters and chamfered edges. The fillet radius at journal corners for stress reduction measures 3 to 5 millimeters. The fatigue life of an original American crankshaft exceeds 20,000 operating hours under rated conditions.You can order and buy Cummins engine crankshaft from Iran by contacting us through whatsaap and email.
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