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COOLING SYSTEM 4-9
Coolant
Pressure Testing
•
Remove the fuel tank (see Fuel System (DFI) chapter).
•
Remove the r adiator cap, and install a cooling system
pressure tester [A] on the filler neck [B].
NOTE
○
Wet the cap sealing surfaces with water or coolant to
preve
nt pressure leaks.
•
Build up pressure in the system carefully until the pres-
sure reaches 123 kPa (1.25 kgf/cm², 17.8 psi).
CAUTION
During pressure testing, do not exceed the pres-
sure for which the system is designed. The maxi-
mum pressure is 123 kPa (1.25 kgf/cm², 17.8 psi).
•
Watch the gauge for at least 6 seconds.
If the pressure holds steady, the system is all right.
If the pressure drops and no external source is found,
check for internal leaks. Droplets in the engine oil indicate
internal leakage. Check t he cylinder head gasket and the
water pump.
•
Remove the pressure tester, replenish the coolant, and
install the radiator cap.
Cooling System Flushing
Over a period of time, the cooling system accumulates
rust, scale, and lime in the water jacket and radiator. When
this accumulation is suspected or observed, flush the cool-
ing system. If this accumulation is not removed, it will clog
up the water passage and considerable reduce the effi-
ciency of the cooling system.
•
Drain the cooling system (see Coolant Change in the P e-
riodic Maintenance chapter).
•
Fill the cooling system with fresh water mixed with a flush-
ing compound.
CAUTION
Do not use a flushing compound which is harmful to
the aluminum engine and radiator. Carefully follow
the instructions supplied by the manufacturer of the
cleaning product.
•
Warm up the engine, and run it at normal operating tem-
perature for about ten minutes.
•
Stop the engine, and drain the cooling system.
•
Fill the system with fresh water.
•
Warm up the engine and drain the system.
•
Repeat the previous two steps once more.
•
Fill the system with a permanent type coolant and bleed
the air from the system (see Coolant Change in the Peri-
odic Maintenance chapter).
Coolant Reserve Tank Removal/Installation
•
The coolant reserve tank is removed and installed dur-
ing coolant change (see Coolant Change in the Periodic
Maintenance chapter).