COOLING SYSTEM 4-15
Radiator
Radiator Inspection
•
Check the radiator core.
If there are obstructions to air flow, remove the radiator
and remove obstructions.
If the corrugated fins [A] are deformed, carefully
straighten them.
If the air passages of the radiator core are blocked more
than 20% by unremovable obstructions or irreparably de-
formed fins, replace the radiator with a new one.
Radiator C leaning
•
Refer to the Radiator C leaning in the Periodic Mainte-
nance chapter.
Radiator Cap Inspection
•
Check the condition of the top and bottom valve seals of
the radiator cap.
If any one of them shows visible damage, replace the cap.
Bottom Valve Seal [A]
Top Valve Seal [B]
ValveSpring[C]
•
Install the cap [A] on a cooling system pressure tester [B].
NOTE
○
Wet the cap sealing surfaces with water or coolant to
prevent pressure leakage.
•
Watching the pressure gauge, slowly pump the pressure
tester to build up the pressure. The relief valve opens,
indicated by the gauge hand flicks downward.
○
The relief valve must open within the r elief pressure range
in the table below and the gauge hand must remain within
the specified range at least 6 second.
Radiator Cap Relief Pressure
Standard: 93 ∼ 123 kPa (0.95 ∼ 1.25 kgf/cm², 14 ∼
18 psi)
If the cap cannot hold the specified pressure, or i f it holds
too much pressure, replace it with a new one.
