Excessive White Smoke

TM 9-2320-312-24-2

Troubleshooting Section

Recommended Actions

Normal operation

Fuel supply

Lubrication

Coolant temperature circuit

1. Remove the valve mechanism covers. Refer to

Disassembly and Assembly, "Valve Mechanism

Hydraulic Electronic Unit Injector

Cover - Remove and Install" for the correct

procedure.

Combustion problem

2. Check the lubrication in the valve compartment.

Intake air heater

Ensure that there is adequate engine oil flow in

the valve compartment. The passages for the

Air inlet restriction

engine oil must be clean.

Recommended Actions

Valve Lash

Perform the following diagnostic procedures in

Adjust the valve lash of the engine. Refer to Testing

order:

and Adjusting, "Air Inlet and Exhaust System" for

the correct procedure.

Normal Operation

Valve Train Components

1. Be aware of normal operating conditions.

1. Inspect the following components of the valve

train:

Cold outside temperatures can affect the

production of white smoke.

Rocker arms

Fuel Supply

Push rods

1. Monitor the exhaust for smoke while the engine

Valve lifters

is being cranked.

Camshaft

If no smoke is present, there may be a problem

with the fuel quality or there may be a problem

Valve stems

with the fuel supply.

Rocker shafts

2. Check the fuel quality. Refer to the Truck

Performance and Driveability Diagnostic Guide,

2. Check the components for the following

LEBT3477.

conditions: abnormal wear, excessive wear,

straightness, and cleanliness. If necessary, use

3. Check the fuel pressure. Refer to Testing and

new parts for replacement.

Adjusting, "Fuel System Pressure - Test".

Note: If the camshaft is replaced, new valve lifters

4. Ensure that the fuel system has been primed.

must also be used.

Refer to Testing and Adjusting, "Fuel System -

Prime".

3. Adjust the valve lash of the engine. Refer to

Testing and Adjusting, "Engine Valve Lash -

5. Check for fuel supply lines that are restricted.

Inspect/Adjust" for the correct procedure.

6. Check the fuel filters.

i01641983

7. If the temperature is below 0 C (32 F), check

Excessive White Smoke

for solidified fuel (wax).

SMCS Code: 1088-035; 7569

8. Check for air in the fuel system. Refer to Testing

and Adjusting, "Air in Fuel - Test".

Probable Causes

Coolant Temperature Circuit

The probable root causes are listed in order below:

1. Connect ET to the cab data link connector.