cummins engine camshaft , Iran

The Cummins engine camshaft is manufactured from forged alloy steel grade 5150 or 1050. Induction hardening heat treatment raises the lobe surface hardness to 55 to 60 HRC. The hardened case depth at the lobe tips is between 3 and 5 millimeters. The number of camshaft lobes in a Cummins inline 6-cylinder engine equals 12. The main journal diameter (bearing surface on block) in the 6BT model equals 63.5 millimeters. This diameter in the NTA855 model reaches 76.2 millimeters and in the KTA19 model reaches 88.9 millimeters. The lobe height from base circle to nose in the 6BT is approximately 45 millimeters. The cam lift value (difference between base circle and nose radius) in this model is 9.5 millimeters. The angular spacing between two adjacent lobes for valve timing adjustment is 120 degrees. The camshaft weight in the 6BT model is approximately 12 kilograms and in the KTA19 model is approximately 28 kilograms.

The cam profile on the Cummins camshaft is designed as a constant maximum acceleration type with a circular arc at the nose. This profile distributes the opening and closing velocity of the valves in a controlled manner. The lobe surface finish after final grinding reaches a roughness below 0.2 micrometers Ra. The roundness tolerance of the camshaft main journals in the original sample is 0.005 millimeters. The total camshaft bending tolerance over one meter length is controlled below 0.03 millimeters. The operating clearance between the camshaft journal and the cylinder block bearing bore is 0.05 to 0.10 millimeters. Oil holes on the journals are machined with a diameter of 3 millimeters and an angle of 45 degrees. The valve opening sequence on the Cummins camshaft for inline engines is 1-5-3-6-2-4. The maximum rotational speed of the camshaft in heavy engines is 1500 revolutions per minute. The service life of an original camshaft under standard conditions is estimated to exceed 15,000 operating hours.You can order and buy cummins engine camshaft from Iran by contacting us through whatsaap and email.
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