ENGINE AND ENGINE SYSTEMS 5540F/YB5515 SERVICE MANUAL
6-10 Published 10-21-2010, Control# 198-04
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.
Radiator Cap and Overflow Bottle
The cooling system is designed to use a radiator cap to
prevent the boiling of lubricant. The radiator cap is set to
open at 7 psi. (50 kPa). When it does open it allows coolant
to be expelled into the overflow bottle and as soon as the
engine cools the overflow fluid is sucked back into the
radiator. An incorrect radiator cap can result in a great loss
of coolant and the engine running hot.
Keep the overflow bottle at least half full of coolant at all
times.
Thermostat
A malfunctioning thermostat can result in the engine running
hot or cold. If it becomes necessary to replace the thermostat
refer to the engine manual furnished with the crane.
Engine Electrical System
The engine electrical system, the charging and starting
systems, as well as the sending units, are described in
Section 11.
CAUTION
Some corrosion inhibitor mixtures contain soluble oil
which can have an adverse effect on some types of water
hoses.
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