Chapter 8 - Caterpillar Engine and Related Systems
237
• Temporarily creating extra back pressure while
the engine runs will cause leaking exhaust gas-
ses to hiss, making them easier to locate.
See Figure 8.47.
• If the leak is at the exhaust manifold or the gas-
ket that seals the manifold to the cylinder head,
contact the partnering Caterpillar dealer before
making repairs.
• Exhaust blockage will result in an immediate
decrease in performance, especially at higher
RPMs. This may also over-heat other compo-
nents.
• To check for blockage, it is necessary to remove
and inspect the individual parts of the system.
Figure 8.47
COOLING SYSTEM
1. Precautions:
CAUTION: Removing the radiator cap or discon-
necting any part of the cooling system when it is
hot will allow it to expel hot coolant under pres-
sure, which may cause sever burns. Allow the
engine and cooling system to cool before remov-
ing the radiator cap or loosening any fittings.
The coolant becomes heated and pressurized in
normal operation.
CAUTION: Always loosen the radiator cap
slowly to release any residual pressure before
removing the cap or loosening any fittings in the
cooling system.
CAUTION: Coolant is toxic. Clean-up spilled
coolant immediately. Dispose of all waste cool-
ant in an environmentally responsible manner.
Contact the nearest EPA office for proper dis-
posal methods and recycling center locations.
CAUTION: The electric cooling fan may start
any time the key switch is in a position other
than OFF. Keep clear of the cooling fan
unless the key is removed from the key switch or
the battery ground cable is disconnected.
CAUTION: It is the job of the cooling system to
dissipate excess engine heat. In doing so, sys-
tem itself gets hot. Do not touch any part of
the cooling system until it has cooled.
NOTE: A non-contact thermometer can be used
to tell if the system is at a safe temperature, and
is a handy diagnostic tool. See Figure 8.48.
Figure 8.48
Non-contact thermometer
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