Right Inner Cover (see Frame chapter)
Remove the radiator cap, and install a cooling system
pressure tester [A] on the filler neck.
Wet the cap sealing surfaces with water or coolant to
prevent pressure leaks.
Build up pressure in the system carefully until the pres-
sure reaches 123 kPa (1.25 kgf/cm², 18 psi).
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, 18 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 the cylinder head gasket and the
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 Cooling System in the Pe-
riodic Maintenance chapter).
Fill the cooling system with fresh water mixed with a flush-
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
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 Cooling System in the Peri-
odic Maintenance chapter).
Coolant Filter Cleaning
Refer to the Fuel System in the Periodic Maintenance
COOLING SYSTEM 4-9