A Series Diesel Engine Coolant System 56
Caution : The small holes in the head gasket are
especially susceptible to plugging.
Water will cause rust formation reducing the flow in
the smaller coolant passages.
Caution : These holes are orifices and their size is
critical. Do not enlarge the size of the
orifices. To do so will disturb the coolant
flow and will not solve an overheating
problem.
Also, water used as a coolant for even a relatively
short period can result in the cup plugs rusting
through allowing the coolant to leak.
Note : A sudden loss of coolant from a heavily loaded
engine can result in severe damage to the
pistons and cylinder bore.
Pressure Caps
The system is designed to use a pressure cap to
prevent boiling of the coolant.
Different caps are specified for the two recommended
systems:
System Cap
A - 104 °C [220°F] 103kPa [15 PSI]
B - 99 °C [210°F] 48kPa [7 PSI]
An incorrect or malfunctioning cap can result in the
loss of coolant and the engine running hot.
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