| Q: What is the flatness spec for the cylinder head on Cummins 6B Series engines? | 9/25/2024 |
| A: The Cummins Repair Manual says that the flatness spec maximum for 6B cylinder heads is .30mm end to end and side to side. | |
Q: What is the parallelism spec for the cylinder head on Cummins 6B Series engines? | 9/25/2024 |
| A: The Cummins Repair Manual says that the parallelism spec for the top and bottom of the cylinder head is .4mm maximum for 6B cylinder heads. | |
Q: What is the cylinder head bolt torque spec on 1999 - 2002 Cummins 6BT engines. | 10/7/2024 |
| A: The Haynes Repair Manual says that there are 4 steps. Firstly, all bolts should be torqued to 59ft-lbs. Then 77 ft-lbs. Then recheck all bolts are 77ft-lbs. In the last step, all bolts are tightened and additional 90 degrees. | |
Q: What is the cylinder head bolt torque spec on 2003 and newer Cummins 6BT engines. | 10/7/2024 |
| A: The Haynes Repair Manual says that there are 4 steps. Firstly, all bolts should be torqued to 52ft-lbs. Then loosen 360 degrees. Then torque to 77 ft-lbs. Then recheck all bolts are 77ft-lbs. In the last step, all bolts are tightened and additional 90 degrees. | |