Two technicians are discussing the torqueing procedure for head bolts. Technician A says that they should be tightened starting at the center of the head and working toward the ends. Technician B says that they should be tightened in three steps or according to the factory specified manner if torque-to-yield or torque-angle. Who is right?

Question

Quizplus · Accepted Answer

Both technicians are correct. Technician A is right because starting at the center and working outward in a spiral pattern is a common method for ensuring even clamping force across the head, which is crucial for maintaining a good seal. Technician B is correct because using a stepped approach or following the manufacturer's specifications, especially for torque-to-yield or torque-angle specifications, is essential for achieving the correct preload on the bolts without over or under-tightening.

Two Technicians Are Discussing the Torqueing Procedure for Head Bolts