Manitowoc CD25, Руководство по обслуживанию, Страница: 153 / 286

6-3
CD25 ENGINE AND ENGINE SYSTEMS
6
Published 5-24-2017, Control# 587-01
2. There is an advantage to using antifreeze even when
frost protection is not necessary. Antifreeze protects
against corrosion and also raises the boiling point of the
coolant. A 50% concentration of antifreeze is preferred,
but if this much protection is not preferred, a 33%
concentration can be used. Never use more than a 65%
concentration under any conditions. Where frost
protection will never be required, use a
non-chromate
corrosion inhibitor and clean soft water. Change the
water/corrosion inhibitor every 12 months, or 500 hours,
or to manufacturer’s recommendation.
Do not use hard water in the cooling system. Hard
w a t e r, o r w a t e r w i t h h i g h l e v e l s o f c a l c i u m a n d
magnesium ions, encourages silica gel formations,
especially after a number of heating and cooling cycles.
These gel formations can result in loss of cooling or
heating in radiators and cab heater cores by coating and
plugging the tubes. The formations usually deposit in the
cooler sections of the cooling system, such as the
radiator bottom tank.
Use soft water, distilled water or deionized water to
reduce the potential and severity of silicate dropouts.
NOTE: If you use water without a corrosion inhibitor, rust
will form and plug the small holes in the head
gasket. 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
any overheating problem. If you use water without
a corrosion inhibitor for even a short period, the cup
plugs will rust through, allowing coolant leakage.
An incorrect or malfunctioning radiator cap can
result in the loss of coolant and engine running hot.
Any sudden loss of coolant from a heavily loaded
engine can result in severe damage to the pistons
and cylinder bore.
Some corrosion inhibitor mixtures contain soluble
oil which can have an adverse effect on some
types of water hoses.
Radiator Cap
The cooling system is designed to use a radiator cap to
prevent the boiling of lubricant. The radiator cap is set to
open at 103 kPa (15 psi). An incorrect radiator cap can result
in a great loss of coolant and the engine running hot.
Thermostat
A malfunctioning thermostat can result in the engine running
hot or cold. If it becomes necessary to replace the thermostat
see the engine manual furnished with the crane.
ENGINE ELECTRICAL SYSTEM
The engine electrical system, the charging and starting
circuits, as well as the sending units, are described in
Electric
System, Section 3 .
ENGINE FUEL SYSTEM
The engine fuel system is a closed-loop fuel system which
includes a fuel tank, an engine fuel filter, an engine fuel pump
and the fuel lines.
A fuel supply line carries fuel from the bottom of the fuel tank
to the engine fuel pump (Figure 6-2). A line carries the fuel
from the engine fuel pump to the engine fuel filter. Fuel that
has been filtered flows to the fuel injector pump.
Fuel is distributed to the fuel injectors from the fuel injector
pump. Excess fuel from the fuel injector pump is returned to
tank.
Fuel Tank
The fuel tank is located on the right side of the crane. It is a
welded box construction with a suction tube installed in the
fuel support port. The tube inhibits sediment and water from
being picked up off the bottom and sent to the engine.
Reference Only