Jeep Wrangler 1997 Manual page 730

9-68
4 .OL ENGINE
REMOVAL AND INSTALLATION (Continued)
ENGINE CYLINDER HEAD
This procedure can be done with the engine in or
out of the vehicle .
REMOVAL
(1)
Disconnect negative cable from battery.
WARNING: DO NOT REMOVE THE CYLINDER
BLOCK DRAIN PLUGS OR LOOSEN THE RADIATOR
DRAIN COCK WITH THE SYSTEM HOT AND PRES-
SURIZED BECAUSE SERIOUS BURNS FROM THE
COOLANT CAN OCCUR.
(2)
Drain the coolant and disconnect the hoses at
the engine thermostat housing . DO NOT waste reus-
able coolant . If the solution is clean and is being
drained only to service the engine or cooling system,
drain the coolant into a clean container for reuse .
(3) Remove the air cleaner assembly.
(4) Remove the engine cylinder head cover.
(5) Remove the capscrews, bridge and pivot assem-
blies and rocker arms.
(6) Remove the push rods . Retain the push rods,
bridges, pivots and rocker arms in the same
order as removed.
(7) Loosen the serpentine drive belt at the power
steering pump, if equipped or at the idler pulley
(refer to Group 7, Cooling System for the proper pro-
cedure) .
(8) If equipped with air conditioning, remove the
air conditioning compressor, (refer to Group 24, Heat-
ing and Air Conditioning) .
(9) If equipped, disconnect the power steering
pump bracket . Set the pump and bracket aside . DO
NOT disconnect the hoses.
(10) Perform the Fuel System Pressure Release
procedure (refer to Group 14, Fuel System) .
(11) Remove the fuel lines and vacuum advance
hose .
(12) Remove the intake and engine exhaust mani-
folds from the engine cylinder head (refer to Group
11, Exhaust System and Intake Manifold for the
proper procedures) .
(13) Disconnect the ignition wires and remove the
spark plugs .
(14) Disconnect the temperature sending unit wire
connector.
(15) Remove the ignition coil and bracket assem-
bly.
(16) Remove the engine cylinder head bolts. Bolt
No.14 cannot be removed until the head is moved for-
ward (Fig. 26) . Pull bolt No . 14 out as far as it will go
and then suspend the bolt in this position (tape
around the bolt).
(17) Remove the engine cylinder head and gasket
(Fig. 26) .
TJ
(18) If this was the first time the bolts were
removed, put a paint dab on the top of the bolt. If the
bolts have a paint dab on the top of the bolt or it
isn't known if they were used before, discard the
bolts .
(19) Stuff clean lint free shop towels into the cyl-
inder bores.
CYLINDER HEAD BOLTS
CYLINDER
HEAD GASKET
Fig. 26 Engine Cylinder Head Assembly
8Oa534al
INSTALLATION
The engine cylinder head gasket is a composition
gasket. The gasket is to be installed DRY DO NOT
use a gasket sealing compound on the gasket.
If the engine cylinder head is to be replaced and
the original valves used, measure the valve stem
diameter. Only standard size valves can be used with
a service replacement engine cylinder head unless
the replacement head valve stem guide bores are
reamed to accommodate oversize
valve stems.
Remove all carbon buildup and reface the valves .
(1) Remove the shop towels from the cylinder
bores. Coat the bores with clean engine oil .
(2) Position the engine cylinder head gasket (with
the numbers facing up) using the alignment dowels
in the cylinder block, to position the gasket .
CAUTION: Engine cylinder head bolts should be
reused only once . Replace the head bolts if they
were used before or if they have a paint dab on the
top of the bolt .
(3)
With bolt No.14 held in place (tape around
bolt), install the engine cylinder head over the same
dowels used to locate the gasket. Remove the tape
from bolt No .14 .
(4) Coat the threads of stud bolt No.11 with Loc-
tite 592 sealant, or equivalent .
(5) Tighten the engine cylinder head bolts in
sequence according to the following procedure (Fig.
27) .