Cummins engine cylinder head , Iran

The Cummins engine cylinder head is cast from GJV-450 or GJV-500 grade alloyed grey cast iron. The casting process is performed using the lost foam or green sand method with precise composition control. The intake and exhaust ports are designed with a swirl pattern to optimize turbulent air flow. The intake valve seat diameter in the 6BT model equals 42 millimeters and the exhaust valve seat equals 38 millimeters. The wall thickness between seats in critical areas is maintained at a minimum of 6 millimeters. The depth of the cooling water gallery around each cylinder is 12 to 15 millimeters with a flow velocity of 1.2 meters per second. The number of cylinder head bolts per cylinder is 4 with a diameter of 16 millimeters and a pitch of 1.5 millimeters. The final bolt torque is applied in two stages of 120 and 180 Newton meters plus an additional 90 degree angle. The flatness tolerance of the cylinder head lower surface is below 0.05 millimeters over the entire length.

The exhaust valve seat is manufactured from copper-based alloy with 15 percent cobalt and 5 percent chromium. The intake valve seat is made from iron-chromium alloy with 12 percent chromium and 2 percent molybdenum. The precise grinding angle of the intake valve seat is 30 degrees and the exhaust valve seat is 45 degrees with a tolerance of 0.1 degrees. The intake valve seat width measures 1.6 to 2.0 millimeters and for the exhaust valve seat measures 2.0 to 2.5 millimeters. The valve stem to phosphor bronze guide clearance for intake is 0.04 to 0.08 millimeters. The exhaust valve guide clearance is set at 0.06 to 0.10 millimeters due to greater thermal expansion. The valve spring pressure in the closed position for the intake valve is 220 Newtons and for the exhaust valve is 280 Newtons. The valve seat counterbore depth is designed between 1.2 and 1.5 millimeters. The surface roughness of the seat after grinding reaches below 0.4 micrometers Ra. Full 360 degree circular contact between the valve and seat is verified using lapping paste.You can order and buy Cummins engine cylinder head from Iran by contacting us through whatsaap and email.
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