Put the pressure cap on the 9S-8140 Pressurizing
Observe the exact pressure when the pressure cap
Compare the pressure to the pressure that is given in
Specifications, "Pressure Cap". If the pressure cap
opens at a pressure beyond the range that is given in
Specifications, "Pressure Cap", the pressure cap is
defective. Replace a defective pressure cap.
Testing The Radiator And Cooling
System For Leaks
Use the following procedure to test the radiator and the cooling
system for leaks.
Pressurized system: Hot coolant can cause serious burn.
To open cap, stop engine, wait until radiator is cool. Then
loosen cap slowly to relieve the pressure.
When the engine has cooled, loosen the pressure cap
to the first stop. Allow the pressure to release from the
cooling system. Then remove the pressure cap.
Make sure that the coolant covered the top of the
Put the 9S-8140 Pressurizing Pump on the radiator.
Use the pressurizing pump to increase the pressure to
an amount of 20 kPa (3 psi) more than the operating
pressure of the pressure cap. This operating pressure
is given in Specifications, "Pressure Cap".
Inspect the radiator for leakage.
Inspect all connections and hoses of the cooling system
The radiator and the cooling system do not have
leakage If all of the following conditions exist:
You do not see any leakage after five minutes.
The dial indicator remains constant beyond five minutes.
The reading on the dial indicator decreases, and you do
not observe any outside leaks.
If any leakage exists on the inside of the cooling system,
identify the location of the leakage. Repair the source of
the leak in the cooling system.
Testing The Water Temperature
Remove the water temperature regulator from the
Hang the water temperature regulator in a pan of water.
Put a thermometer in the water. Put the water
temperature regulator completely under water. Do not
allow the water temperature regulator to be in contact
with the pan.
Heat the water in a container. Stir the water in order to
keep all of the water at the same temperature.
Replace the water temperature regulator if the water
temperatures that are given in Specifications, "Water
Engine And Cooling System Heat
NOTE: Use a coolant recovery system in order to collect
any coolant which drains from the coolant
The following conditions indicate that a heat problem
Hot coolant is released through the pressure cap
during the normal operation of the engine. Hot
coolant can also be released when the engine is
Hot coolant is released from the coolant system but
not through the pressure cap during normal operation
of the engine. Hot coolant can also be released when
the engine is stopped.
Coolant must be added frequently to the cooling
system. The coolant is not released through the
pressure cap or through an outside leak.
If any of the conditions in Step 1 exist, perform the
approximately 1200 rpm, for three minutes after the
high idle shuts off. Running the engine at medium
idle will allow the engine to cool before the engine is