Make sure the coolant is over the top of the
Put the 9S8140 Cooling System Pressurizing
Pump Group on the radiator.
Get the pressure reading on the gauge to 3 psi
(20 kPa) more than the pressure on the
Check the radiator for outside leakage.
Check all connections and hoses for the cooling
system for outside leakage.
If you do not see any outside leakage and the
pressure reading on the gauge is still the same
after 5 minutes, the radiator and cooling system
does not have leakage. If the reading on the
gauge goes down and you do not see any
outside leakage, there is leakage on the inside
of the cooling system. Make repairs as
The 9S8140 Cooling System Pressurizing Pump
Group is used to test pressure caps and pressure relief
valves, and to pressure check the cooling system for
Gauge for Water Temperature
9S9102 Thermistor Thermometer Group.
If the engine gets too hot and a loss of coolant is
a problem, a pressure loss in the cooling system can be
the cause. If the gauge for water temperature shows
that the engine is getting too hot, look for coolant
If a place can not be found where there is
coolant leakage, check the accuracy of the gauge for
water temperature. Use the 9S9102 Thermistor
To help prevent an accident caused
by parts In rotation, work carefully
on an engine that has been started.
Start the engine. Put a cover over part of the
radiator. The reading on the gauge for water
temperature must be the same as the reading on the
9S9102 THERMISTOR THERMOMETER GROUP
Test procedure for water temperature regulators:
Remove the regulator from the engine.
Put heat to a pan of water. Get the temperature
of the water to 197° F (920 C).
Hang the regulator in the pan of hot water. Put
the regulator completely under the water. Do
not let the regulator make contact with the pan.
Keep the temperature of the water at 197°F
(920 C) for ten minutes. Make the water move
around. This keeps all of the water at the same
After ten minutes, remove the regulator and
immediately measure the distance the regulator
is opened. See the SPECIFICATIONS for the
correct opening distance.
WATER PUMP PRESSURE CHECK
9S8138 Pressure Gauge.
The pressure at the outlet for the water pump
tells if the shunt system and water pump are operating
correctly. To check the pump pressure, install pressure
gauge (2) in the front cover. The pressure must be a
minimum of 15 psi (105 kPa) at 2800 rpm.
If the pump pressure is less than the minimum
pressure: First, check the vent tube between the
radiator top tank and the surge tank; it must have an
inside diameter of approximately .19 in. (4.8 mm).
Second check to see that the shunt line has a
minimum inside diameter of .75 in. (19.1 mm).