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COOLING SYSTEM
TESTING AND ADJUSTING
The 8T470 Thermistor Thermometer Group is
used in the diagnosis of overheating (engine hotter than
normal) or overcooling (engine cooler than normal)
problems.
This  group  can  be  used  to  check
DO NOT loosen the filler cap or pressure cap on a
temperatures in several different parts of the cooling
hot engine. Steam or hot coolant can cause severe
system. The testing procedure is in Special Instruction
burns.
Form No. SEHS8446.
The 9S7373 Air Meter Group is used to check
the air flow through the radiator core. The test procedure
is in Special Instruction Form No. SMHS7063.
TYPICAL SCHEMATIC OF PRESSURE CAP A.
A. Sealing surface of cap and radiator.
1.
After the engine is cool, loosen the pressure cap
9S7373 AIR METER GROUP
to the first stop and let the pressure out of the cooling
system. Then remove the pressure cap.
The 6V3121 Multitach Group can be used to
check the fan speed.  Special Instruction Form No.
One cause for a pressure loss in the cooling
SEHS7807 is with this group and gives instructions for
system can be a bad seal on the pressure cap of the
the procedure.
system. Inspect the pressure cap carefully. Look for
damage to the seal or to the surface that seals. Any
foreign material or deposits on the cap, valve, seal, or
surface that seals must be removed.
2.
Put the pressure cap on the 9S8140 Cooling
System Pressurizing Pump Group.
6V3121 MULTITACH GROUP
1.  Carrying case.  2.  Power cable.  3.
Tachometer generator. 4. Tachometer drive
group. 5. Multitach.
Pressure Cap Test
9S8140 COOLING SYSTEM PRESSURIZING PUMP
GROUP
Tools Needed:
9S8140 Cooling System Pressurizing Pump
Group
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