Jeep Liberty KJ. Manual — part 934
EXHAUST SYSTEM AND TURBOCHARGER
DESCRIPTION
GAS ENGINES
The basic exhaust system consists of a exhaust pipe assembly with catalytic converters (2), muffler (4) and tailpipe
assembly and heat shields.
The exhaust system must be properly aligned to prevent stress, leakage and body contact. Minimum clearance
between any exhaust component and the body or frame is 25 mm (1.0 in.). If the system contacts any body panel,
it may amplify objectionable noises from the engine or body.
When inspecting an exhaust system, critically inspect for cracked or loose joints, stripped screw or bolt threads,
corrosion damage and worn, cracked or broken hangers. Replace all components that are badly corroded or dam-
aged. DO NOT attempt to repair.
When replacement is required, use original equipment parts (or equivalent). This will assure proper engine function
and system alignment.
CAUTION: Avoid application of rust prevention compounds or undercoating materials to exhaust system
floor pan exhaust heat shields. Light overspray near the edges is permitted. Application of coating will
result in excessive floor pan temperatures and objectionable fumes.
2.8L DIESEL
CAUTION: Avoid application of rust prevention compounds or undercoating materials to exhaust system
floor pan exhaust heat shields. Light overspray near the edges is permitted. Application of coating will
result in excessive floor pan temperatures and objectionable fumes.
The diesel engine exhaust system consists of an engine exhaust manifold, turbocharger, EGR valve with intercooler,
front exhaust pipe with catalytic converter, muffler and tailpipe assembly.
The exhaust system must be properly aligned to prevent stress, leakage and body contact. The exhaust compo-
nents should be kept a minimum of 25.4 mm (1.0 in.) away from the body and frame. If the system contacts any
body panel, it may amplify objectionable noises from the engine or body.
11 - 2
EXHAUST SYSTEM
KJ
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - EXHAUST SYSTEM
EXHAUST SYSTEM DIAGNOSIS CHART
CONDITION
POSSIBLE CAUSE
CORRECTION
EXCESSIVE EXHAUST NOISE OR
LEAKING EXHAUST GASES
1. Leaks at pipe joints.
1. Tighten clamps/bolts to specified
torque at leaking joints.
2. Rusted or blown out muffler.
2. Replace muffler. Inspect exhaust
system.
3. Broken or rusted out exhaust
pipe.
3. Replace exhaust pipe.
4. Exhaust pipe leaking at manifold
flange.
4. Tighten/replace flange attaching
nuts/bolts.
5. Exhaust manifold cracked or
broken.
5. Replace exhaust manifold.
6. Leak between exhaust manifold
and cylinder head.
6. Tighten exhaust manifold to
cylinder head bolts.
7. Catalytic converter rusted or
blown out.
7. Replace catalytic converter assy.
8. Restriction in exhaust system.
8. Remove restriction, if possible.
Replace restricted part if necessary.
CAUTION:
When servicing and replacing exhaust system components, disconnect the oxygen sensor connector(s). Allowing
the exhaust to hang by the oxygen sensor wires will damage the harness and/or sensor.
KJ
EXHAUST SYSTEM
11 - 3
DIESEL ENGINE
CAUTION: On high mileage vehicles it is normal to see some exhaust staining around the turbocharger con-
trol rod area. This is not a sign of turbocharger failure.
EXHAUST SYSTEM DIAGNOSIS CHART
CONDITION
POSSIBLE CAUSE
CORRECTION
EXCESSIVE EXHAUST NOISE OR
LEAKING EXHAUST GASES
1. Leaks at pipe joints.
1. Tighten clamps/bolts at leaking
joints.
2. Rusted or blown out muffler.
2. Replace muffler. Inspect exhaust
system.
3. Broken or rusted out exhaust
pipe.
3. Replace exhaust pipe.
4. Exhaust pipe leaking at manifold
flange.
4. Tighten/replace flange attaching
nuts/bolts.
5. Exhaust manifold cracked or
broken.
5. Replace exhaust manifold.
6. Leak between exhaust manifold
and cylinder head.
6. Tighten exhaust manifold to
cylinder head bolts. Replace gasket
if necessary.
7. Turbocharger mounting flange
cracked.
7. Remove turbocharger and
inspect. (Refer to 11 - EXHAUST
SYSTEM/TURBOCHARGER
SYSTEM/TURBOCHARGER -
REMOVAL).
8. Restriction in exhaust system.
8. Remove restriction, if possible.
Replace restricted part if necessary.
9. EGR pipe(s) leak
9. Tighten bolts. Replace gasket.
10. EGR assembly leak
10. Tighten bolts. Replace gaskets.
Drivability Concern - Turbo
1. Vacuum hose disconnected
1. Check connections, replace as
necessary
2. Vacuum system leaks
2. Inspect for damage. Check for
leaks, replace as necessary
3. Boost pressure solenoid filter
clogged
3. Replace the filter.
SPECIFICATIONS
TORQUE
DESCRIPTION
N·m
Ft. Lbs.
In. Lbs.
EGR Pipe to EGR Inlet
32
24
-
Front Exhaust Pipe
Flange-to-Exhaust
Manifold Bolts
36
28
-
Front Exhaust pipe-to-
Muffler Flange Nuts
36
28
-
Turbocharger Support
Bracket Bolts
24
18
-
11 - 4
EXHAUST SYSTEM
KJ
DESCRIPTION
N·m
Ft. Lbs.
In. Lbs.
Turbocharger Downpipe
Nuts
32
24
-
Turbocharger Oil Supply
Line Fitting
24
18
215
Turbocharger Oil Return
Line bolts
11
-
96
Turbocharger to Exhaust
Manifold Nuts
32
24
-
KJ
EXHAUST SYSTEM
11 - 5
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст