Figure 11B-23. Cylinder Head Assembly
Cylinder Head Maintenance
inspection should be made to find the
cause and avoid a recurrence of the fail-
The engine operating temperature should
ure.
be maintained between 160-185F
(71-85C) and the cooling system should
Unsuitable water in the cooling system
be inspected daily and kept full at all
may result in lime and scale formation
times.
The cylinder head fire deck will
and prevent proper cooling. The cylin-
overheat and crack in a short time if the
der head should be inspected around the
coolant does not cover the fire deck sur-
exhaust valve water jackets. This can
face. When necessary, add coolant
be done by removing an injector tube.
slowly to a hot engine to avoid rapid
W h e r e inspection discloses such deposits,
cooling which can result in distortion and
use a reliable non-corrosive scale remov-
cracking of the cylinder head (and cyl-
er to remove the deposits from the
inder block).
c o o l i n g system of the engine, since a sim-
ilar condition will exist in the cylinder
Abnormal operating conditions or neglect
block and other components of the
of certain maintenance items may cause
engine.
cracks to develop in the cylinder head.
If this type of failure occurs, a careful
Engine (Less Major Assemblies)
11B-15
