4 Measure the total carbon deposit thickness inside the air dis‐
charge line as shown.
If the total carbon deposit (X + X) exceeds 2 mm (1/16 in),
clean and inspect the cylinder head, the valve assembly, and
the discharge line.
5 Replace if necessary.
Contact the Cummins Authorized Repair Location for proce‐
dures.
6 If the total carbon deposit exceeds specifications, examine the
air discharge line connections up to the first tank until total
carbon deposit is less than 2 mm (1/16 in).
7 Clean or replace any lines or connections that exceed this
specification.
8 Examine any air driers, splitter valves, pressure relief valves,
and alcohol injectors for carbon deposits or malfunctioning
parts. Inspect for air leaks. Maintain and repair the parts
according to the manufacturer's specifications.
Examine the air cleaner restriction
CAUTION
Never operate the engine without an air cleaner. Intake air must be
filtered to prevent dirt and debris from entering the engine and caus‐
ing premature wear.
20 1 Engine – 1.6 Intake and exhaust system
TL2 Maintenance Manual
591 003 Default
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