Cylinder Head Bolt

Cylinder head bolt is one of the core fasteners of the engine. It tightly clamps the cylinder head to the cylinder block to form a sealed combustion chamber.
During engine operation, the bolt bears continuous alternating dynamic loads from pressure and vibration. Any improper installation may lead to engine failure.
It must be installed with a torque wrench following the specified tightening torque and alternating order. Do not tighten by feeling.
This kind of bolt is prone to fatigue after long-time working. It needs careful inspection during engine overhaul. Replace it once deformation or crack is found. It is not recommended to reuse old bolts.