Radiator - Toyota 4A-FE Repair Manual

COOLING SYSTEM - Radiator C0-15
''~-Radiator
Cap Tester
Radiator Cap
C00034
Radiator Cap Tester
C00492
RADIATOR
CLEANING OF RADIATOR
Using water or steam cleaner, remove any mud and dirt
from the radiator core.
NOTICE: If using a high pressure type cleaner, be
careful not to deform the fins of the radiator core. If
the cleaner nozzle pressure is 30 - 35 kg/cm
2
(427 -
498 psi, 2.942 - 3,432 kPaJ, keep a distance of at
least 40 - 50 cm (15.75 - 19.69 in.) between the
radiator core and cleaner nozzle.
INSPECTION OF RADIATOR
1.
INSPECT RADIATOR CAP
Using
a
radiator cap tester, pump the tester until relief
valve opens. Check that valve opens between 0.75 kg/crn 2
(10.7 psi, 74 kPa) and 1 .05 kg/cm
2
(14.9 psi,
103
kPa).
Check that the pressure gauge does not drop rapidly when
pressure on cap is below 0.6 kg/cm 2 (8.5 psi, 59 kPa).
Measure the relief valve opening pressure.
If either check is not within limits, replace the radiator cap.
2. CHECK COOLING SYSTEM FOR LEAKS
(a)
Fill the radiator with coolant and attach
a
radiator cap
tester.
(b)
Warm up the engine.
(c} Pump it to 1.2 kg/crn
2
(17psi, 118 kPa), check that
pressure does not drop.
If the pressure drops, check for leaks from the hoses,
radiator or water pump. If no external leaks are found,
check the heater core, block and head.