TM 5-3810-300-24&P-3
CYLINDER HEAD 1.2
Fig. 3 - Typical Mounting of Cylinder Head
sealed with synthetic rubber seal rings which fit into
counterbored holes in the block. A synthetic rubber seal
fits into a milled groove near the perimeter of the block.
When the cylinder head is drawn down, a positive
leakproof metal-to-metal contact is assured between the
head and the block.
Cylinder Head Maintenance
The engine operating temperature should be maintained
between 160-185 c F or 71-85 c C and the cooling
system should be inspected daily and kept full at all
times. The cylinder head fire deck will overheat and
crack in a short time if the coolant does not cover the fire
deck surface. When necessary, add water slowly to a
hot engine to avoid rapid cooling which can result in
distortion and cracking of the cylinder head (and cylinder
block).
Abnormal operating conditions or neglect of certain
maintenance items may cause cracks to develop in the
Fig. 4 - Coolant Passages Around Exhaust Valves and
cylinder head. If this type of failure occurs, a careful
Fuel Injectors
inspection should be made to find the cause and avoid a
recurrence of the failure.
Unsuitable water in the cooling system may result in lime
and scale formation and prevent proper cooling. The
cylinder head should be inspected around the 31
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