Toyota Tundra 2005 Service - Repair - Maintenance page 2059

Radiator Cap Tester
30° or More
Radiator Cap
Radiator Cap Tester
COOLING (2UZ−FE) − RADIATOR
ON−VEHICLE INSPECTION
1. REMOVE RADIATOR CAP
CAUTION:
To avoid the danger of being burned, do not remove the ra-
diator cap while the engine and radiator are still hot, as fluid
and steam can be blown out under pressure.
2. INSPECT RADIATOR CAP
NOTICE:
S
If the radiator cap has contaminations, always rinse
it with water.
S
Before using a radiator cap tester, wet the relief valve
and pressure valve with engine coolant or water.
S
When performing steps (a) and (b) below, keep the
tester at an angle of over 30° above the horizontal.
(a) Using a radiator cap tester, slowly pump the tester and
CO1242
check that air is coming from the vacuum valve.
Pump speed: 1 push/(3 seconds or more)
NOTICE:
Push the pump at a constant speed.
If air is not coming from the vacuum valve, replace the radiator
cap.
(b) Pump the radiator cap tester, and measure the relief valve
opening pressure.
Pump speed: 1 push within 1 second
NOTICE:
This pump speed is for the first pump only (in order to close
the vacuum valve). After this, the pump speed can be re-
duced.
Opening pressure:
Standard
Minimum
HINT:
Use the tester's maximum reading as the opening pressure.
If the opening pressure is less than minimum, replace the radia-
tor cap.
3. INSPECT COOLING SYSTEM FOR LEAKS
(a) Fill the radiator with coolant and attach a radiator cap tes-
ter.
(b) Warm up the engine.
(c) Pump it to 118 kPa (1.2 kgf/cm
the pressure does not drop.
If the pressure drops, check the hoses, radiator or water pump
for leaks. If no external leaks are found, check the heater core,
cylinder block and head.
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4. REINSTALL RADIATOR CAP
74 to 103 kPa (0.75 to 1.05 kgf/cm
59 kPa (0.6 kgf/cm
2
, 17.1 psi), and check that
CO−15
CO0IZ−09
2
,10.7 to 14.9 psi)
2
, 8.6 psi)