Exhaust Temperature

TM 9-2320-312-24-2

Testing and Adjusting Section

Hoses

4. Compare the value that was recorded in Step 3

to the pressure that is given in the TMI (Technical

Gasket joints

Marketing Information). The correct pressure

is also given in the Fuel Setting And Related

Information Microfiche.

Pressurized air can cause personal injury. When

i01281586

pressurized air is used for cleaning, wear a protec-

Exhaust Temperature - Test

tive face shield, protective clothing, and protective

shoes.

SMCS Code: 1088-081

Ensure that the constant torque hose clamps are

Table 10

tightened to the correct torque. Check the truck

Tools Needed

manufacturer's specifications for the correct torque.

Check the welded joints for cracks. Ensure that

Part

Part Name

Quantity

Number

the brackets are tightened in the correct positions.

Ensure that the brackets are in good condition. Use

123-6700

Laser Infrared Thermometer

compressed air to clean any debris or any dust

from the aftercooler core assembly. Inspect the

When the engine runs at low idle, the temperature of

cooler core fins for the following conditions:

an exhaust manifold port can indicate the condition

of a unit injector:

Damage

A low temperature indicates that no fuel is flowing

Debris

to the cylinder. An inoperative unit injector pump

could cause this low temperature.

Corrosion

A very high temperature can indicate that too much

Use a stainless steel brush to remove any corrosion.

fuel is flowing to the cylinder. A malfunctioning unit

Ensure that you use soap and water.

injector could cause this very high temperature.

Note: When parts of the air-to-air aftercooler

Use the 123-6700 Infrared Thermometer to check

system are repaired, a leak test is recommended.

this exhaust temperature. You can find operating

When parts of the air-to-air aftercooler system are

instructions and maintenance instructions inside the

replaced, a leak test is recommended.

Operator's Manual, NEHS0630, "123-6700 Infrared

Thermometer II with Laser Sighting".

The use of winter fronts or shutters is discouraged

with air-to-air aftercooled systems. Winter fronts can

only be used on certain truck models. On these

i01665993

trucks, tests have shown that the engine jacket

Aftercooler - Test

water will overheat before the inlet manifold air

temperature is excessive. These trucks use sensors

and indicators that are installed in order to indicate

SMCS Code: 1063-081

engine operating conditions before excessive inlet

manifold air temperatures are reached. Check with

Table 11

the truck manufacturer about the use of both winter

Required Tools

fronts and shutters.

Part

Part Name

Quantity

Number

Inlet Manifold Pressure

1U-5470

Engine Pressure Group

Normal inlet manifold pressure with high exhaust

198-4240

temperature can be caused by blockage of the

Pressure Indicator Tool Gp

fins of the aftercooler core. Clean the fins of the

FT-1984

Aftercooler Testing Group

aftercooler core. Refer to "Visual Inspection" for the

cleaning procedure.

FT-1438

Aftercooler (Dynamometer

Test)

Low inlet manifold pressure and high exhaust

manifold temperature can be caused by any of the

Visual Inspection

following conditions:

Inspect the following parts at each oil change:

Air lines