Jeep Wrangler TJ. Manual — part 426
SPECIAL TOOLS
2.4L ENGINE
Puller 1026
Crankshaft Damper Removal Insert 6827-A
Camshaft Sprocket Holder 6847
Camshaft Seal Remover C-4679-A
Camshaft Seal Installer MD-998306
Crankshaft Damper Installer 6792
Valve Spring Compressor 8215
Adaptor 8436
Valve Spring Compressor MD998772A
Valve Spring Compressor Adapter 6779
TJ
ENGINE 2.4L
9 - 19
ENGINE 2.4L (Continued)
Cylinder Bore Gage C-119
Crankshaft Sprocket Remover 6793
Crankshaft Sprocket Remover Insert C-4685-C2
Crankshaft Seal Remover 6771
Oil Pressure Gauge C-3292
Rear Crankshaft Seal Guide and Installer 6926-1 and
6926-2
Balance Shaft Sprocket Installer 6052
Front Crankshaft Oil Seal Installer 6780
Combustion Leak Tester C-3685-A
Cylinder Compression Pressure Adaptor 8116
9 - 20
ENGINE 2.4L
TJ
ENGINE 2.4L (Continued)
AIR CLEANER ELEMENT - 2.4L
REMOVAL - 2.4L
Housing removal is not necessary for element (fil-
ter) replacement.
(1) Disconnect air intake duct at front of element
cover.
(2) Pry up spring clips (Fig. 5) from housing cover
(spring clips retain cover to housing).
(3) Release
housing
cover
from
locating
tabs
located on housing, and remove cover.
(4) Remove air cleaner element (filter) from hous-
ing.
(5) Clean inside of housing before replacing ele-
ment.
INSTALLATION - 2.4L
(1) Install element into housing.
(2) Position housing cover into housing locating
tabs.
(3) Pry up spring clips and lock cover to housing.
(4) Connect air intake duct.
If any air filter, air resonator, air intake tubes or
air filter housing clamps had been loosened or
removed, tighten them to 5 N·m (40 in. lbs.) torque.
AIR CLEANER HOUSING
REMOVAL
(1)
(2) Disconnect air intake duct at front of element
cover.
(3) Pry up spring clips from housing cover (spring
clips retain cover to housing).
(4) Release
housing
cover
from
locating
tabs
located on housing, and remove cover. (Fig. 6)
(5) Remove air cleaner element (filter) from hous-
ing.
(6) Remove vent hose.
(7) Remove the housing mounting nut.
(8) Remove the air cleaner housing.
Fig. 5 AIR CLEANER ELEMENT - 2.4L
1 - COVER
2 - HOUSING
3 - CLAMP
4 - SPRING CLIPS
5 - HOUSING MOUNTING NUT
Fig. 6 AIR CLEANER ELEMENT - 2.4L
1 - COVER
2 - HOUSING
3 - CLAMP
4 - SPRING CLIPS
5 - HOUSING MOUNTING NUT
TJ
ENGINE 2.4L
9 - 21
INSTALLATION
(1) Install
the
air
cleaner
housing
mounting
bracket.
(2) Install the air cleaner housing and mounting
nut. Tighten nut to 4.5 N·m ( 40 in. lbs.).
(3) Install vent hose.
(4) Install air cleaner element into the housing.
(5) Position the housing cover into the locating
tabs on the housing and install the cover.
(6) Pry up the spring clips and lock the cover in
place.
(7) Install the air intake duct. (Fig. 6)
(8) Install the air outlet duct.
CYLINDER HEAD
DESCRIPTION
The cross flow designed, aluminum cylinder head
contains dual over-head camshafts with four valves
per cylinder (Fig. 7). The valves are arrange in two
in-line banks. The intake valves face toward the left
side of the vehicle. The exhaust valves face the right
side. The cylinder head incorporates powdered metal
valve guides and seats. The cylinder head is sealed to
the block using a multi-layer steel head gasket and
retaining bolts.
Integral oil galleries providing lubrication passages
to the hydraulic lash adjusters, camshafts, and valve
mechanisms.
OPERATION
The cylinder head closes the combustion chamber,
allowing the pistons to compress the fuel/air mixture
for ignition. The valves are actuated by the lobe pro-
files on the camshaft to open and close at specified
duration to either allow clean air in the combustion
chamber or the exhaust gases out; depending on the
stroke of the engine.
DIAGNOSIS AND TESTING
CYLINDER HEAD GASKET
A cylinder head gasket leak can be located between
adjacent cylinders or between a cylinder and the
adjacent water jacket.
Possible indications of the cylinder head gasket
leaking between adjacent cylinders are:
• Loss of engine power
• Engine misfiring
• Poor fuel economy
Possible indications of the cylinder head gasket
leaking between a cylinder and an adjacent water
jacket are:
• Engine overheating
• Loss of coolant
• Excessive steam (white smoke) emitting from
exhaust
• Coolant foaming
CYLINDER-TO-CYLINDER LEAKAGE TEST
To determine if an engine cylinder head gasket is
leaking between adjacent cylinders, follow the proce-
dures in Cylinder Compression Pressure Test (Refer
to 9 - ENGINE - DIAGNOSIS AND TESTING). An
engine cylinder head gasket leaking between adja-
cent cylinders will result in approximately a 50 - 70%
reduction in compression pressure.
CYLINDER-TO-WATER JACKET LEAKAGE TEST
WARNING: USE EXTREME CAUTION WHEN THE
ENGINE IS OPERATING WITH COOLANT PRES-
SURE CAP REMOVED.
VISUAL TEST METHOD
With the engine cool, remove the coolant pressure
cap. Start the engine and allow it to warm up until
thermostat opens.
If a large combustion/compression pressure leak
exists, bubbles will be visible in the coolant.
Fig. 7 Cylinder Head and Camshafts
1 - CAMSHAFT BEARING CAPS
2 - PLUG
3 - CAMSHAFT
4 - CYLINDER HEAD
5 - CAMSHAFT OIL SEAL
9 - 22
ENGINE 2.4L
TJ
AIR CLEANER HOUSING (Continued)
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