Service Manual

Air Leaks, Air Intake and Exhaust Systems ISB, ISBe and QSB (Common Rail [...]
Page 10-20 Section 10 - Air Intake System - Group 10
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Operate the engine and check for leaks.
Air Leaks, Air Intake and Exhaust
Systems (010-024)
Initial Check
Leaks in the intake air system are most commonly
identified by:
1 Inspection of piping for cracked or loose clamps
2 Applying a solution of soapy water in the suspected
area and inspecting for bubbles
3 Listening for high-pitched whining or sucking noise in
the suspected area.
CAUTION
Engine intake air must be filtered to keep dirt and
debris from entering the engine. If intake air piping is
damaged or loose, unfiltered air will enter the engine
and cause premature wear.
Inspect the inlet air piping for cracked hoses and
damaged or loose clamps.
Operate the engine at high idle and use a solution of
soapy water to spot inlet air leaks.
If an air leak exists at the turbocharger fresh air inlet, the
soap bubbles will be drawn in with the air.