Jeep Grand Cherokee WK. Manual — part 1220
2. Install cylinder head cover and hand start all fas-
teners. Verify that all double ended studs are in the
correct location and install left and right ground
straps.
CAUTION: The ground straps must be installed in
the same location as removed. The covers are
machined to accept the ground straps in those
locations only.
NOTE: The right hand ground strap is located on
the front inboard stud. The left hand ground strap
is located on the rear inboard stud.
3. Tighten cylinder head cover bolts and double
ended studs to 8 N·m (70 in. lbs). Begin torque
sequence in the middle of head cover and torque
bolts moving outward in a crisscross pattern from
top to bottom.
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ENGINE - 5.7L SERVICE INFORMATION
WK
4. Install ignition coil on plug (5) , and torque fasten-
ers (6) to 12 N·m (105 in. lbs)
5. Connect, ignition coil electrical connectors (4).
6. Install PCV hose.
7. Connect battery negative cable.
VALVES & SEATS - INTAKE/EXHAUST
DESCRIPTION
DESCRIPTION - VALVE GUIDES
The valve guides are made of powered metal and are pressed into the cylinder head. The guides are not replace-
able or serviceable, and valve guide reaming is not recommended. If the guides are worn beyond acceptable limits,
replace the cylinder heads.
DESCRIPTION
Both the intake and exhaust valves are made of steel. The intake valve is 50.93 mm (2.00 inches) in diameter and
the exhaust valve is 39.53 mm (1.55 inches) in diameter. All valves use three bead lock keepers to retain the
springs and promote valve rotation.
STANDARD PROCEDURE - REFACING
NOTE: Valve seats that are worn or burned can be reworked, provided that correct angle and seat width are
maintained. Otherwise the cylinder head must be replaced.
NOTE: When refacing valves and valve seats, it is important that the correct size valve guide pilot be used
for reseating stones. A true and complete surface must be obtained.
1. Using a suitable dial indicator measure the center of the valve seat Total run out must not exceed 0.051 mm
(0.002 in).
2. Apply a small amount of Prussian blue to the valve seat, insert the valve into the cylinder head, while applying
light pressure on the valve rotate the valve. Remove the valve and examine the valve face. If the blue is trans-
ferred below the top edge of the valve face, lower the valve seat using a 15 degree stone. If the blue is trans-
ferred to the bottom edge of the valve face, raise the valve seat using a 65 degree stone.
3. When the seat is properly positioned the width of the intake seat must be 1.018 - 1.62 mm (0.0464 - 0.0637 in.)
and the exhaust seat must be 1.48 - 1.92 mm (0.058 - 0.075 in.).
4. Check the valve spring installed height after refacing the valve and seat. The installed height for both intake and
exhaust valve springs must not exceed 46.0 mm (1.81 in.).
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ENGINE - 5.7L SERVICE INFORMATION
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VALVE FACE AND VALVE SEAT ANGLE CHART
DESCRIPTION
SPECIFICATION
SEAT WIDTH
INTAKE
1.018 - 1.62 mm
(0.0464 - 0.0637 in.)
EXHAUST
1.48 - 1.92 mm
(0.058 - 0.075 in.)
FACE ANGLE
(INT. AND EXT.)
45° - 45
1
⁄
2
°
SEAT ANGLE
(INT. AND EXT.)
44
1
⁄
2
° - 45°
5. The valve seat must maintain an angle of 44.5 –
45.0 degrees angle.
6. The valve face must maintain a face angle of 45.0
– 45.5 degrees angle.
REMOVAL
1. Remove the cylinder head (Refer to 9 - ENGINE/CYLINDER HEAD - REMOVAL).
2. Compress valve springs using Valve Spring Compressor Tool special tool # C-3422and adapter 8464.
3. Remove valve retaining locks, valve spring retainers, valve stem seals and valve springs.
4. Before removing valves, remove any burrs from valve stem lock grooves to prevent damage to the valve guides.
Identify valves to ensure installation in original location.
INSTALLATION
1. Clean valves thoroughly. Discard burned, warped and cracked valves.
2. Remove carbon and varnish deposits from inside of valve guides with a reliable guide cleaner.
3. Measure valve stems for wear. If wear exceeds 0.051 mm (0.002 inch), replace the valve.
4. Coat valve stems with lubrication oil and insert them in cylinder head.
5. If valves or seats are reground, check valve stem height. If valve is too long, replace cylinder head.
6. Install new seals on all valve guides. Install valve springs and valve retainers.
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ENGINE - 5.7L SERVICE INFORMATION
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7. Compress valve springs with Valve Spring Compressor Tool special tool # C- 3422and adapter 8464, install locks
and release tool. If valves and/or seats are ground, measure the installed height of springs. Make sure the mea-
surement is taken from bottom of spring seat in cylinder head to the bottom surface of spring retainer.
8. Install cylinder head (Refer to 9 - ENGINE/CYLINDER HEAD - INSTALLATION).
ROCKER ARM
REMOVAL
1. Remove
cylinder
head
cover.
(Refer
to
9
-
ENGINE/CYLINDER
HEAD/CYLINDER
HEAD
COVER(S) - REMOVAL).
2. Install pushrod retaining plate (1)special tool 9070.
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ENGINE - 5.7L SERVICE INFORMATION
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