Cylinder Head and Valves
The cylinder head and block must be flat to provide an
even clamping pressure over the entire surface of gasket,
and must have the proper surface finish to keep gasket
material from moving in the joint. Dowels (D) are used to
properly locate head gasket on block.
The cylinder liners must protrude evenly from top of
cylinder block the specified amount to provide adequate
clamping force on fire ring of each cylinder.
The cap screws must be proper length, made of proper
material, and be tightened to proper torque in order to
provide an adequate clamp local between other joint
Each of the above components contributes to the integrity
of the head gasket joint. If any of these components do
not conform to specifications, gasket joint may fail
resulting in combustion leaks, coolant leaks, or oil leaks.
Operating conditions such as coolant, oil, and combustion
temperatures, and combustion pressures can reduce the
ability of the head gasket joint to function properly. Failure
of head gasket and mating parts may occur when coolant
and oil temperatures become excessive, or when
abnormally high combustion temperatures and pressures