Cylinder Head And Cover; Exhaust Manifold (8-Cylinder) - Jeep 1979 CJ-5 Technical & Service Manual

ENGINES 1B-51
Installation
N O T E : When installing replacement intake manifold,
transfer all components such as EGR valve and back-
pressure sensor, EGR CTO, thermos tat/housing and
temperature gauge sending unit from original manifold.
Clean and tighten as required.
(1) Apply non-hardening sealer or silicone sealer
such as Jeep Gasket-in-a-Tube, or equivalent, to both
sides of replacement manifold gasket.
(2) Position gasket by aligning locators at rear of
cylinder head. While holding rear in place, align front
locators.
(3) Install two end seals. Apply Permatex No. 2,
Jeep Gasket-in-a-Tube, or equivalent, to seal ends.
(4) Install intake manifold and retaining screws.
Make sure all screws are properly started before tight-
ening. Tighten to 43 foot-pounds (58 N*m) torque.
(5) Install diverter valve and connect air pump out-
put hose.
(6) Connect air delivery hoses to air injection
manifold(s).
(7) Identify and connect all disconnected hoses,
lines, linkages and wires to intake manifold and
carburetor.
(8) Install TCS solenoid vacuum valve and solenoid
control switch, if equipped, to right side rocker arm
cover.
(9) Install ignition coil and bracket assembly.
(10) Connect radiator upper hose and bypass hose.
(11) Install ignition wire plastic separators to cylin-
der head cover brackets.
(12) Connect ignition wires.
(13) Install air cleaner assembly.
(14) Add coolant as necessary.
Exhaust Manifold
The swept-flow design of the cast iron manifold pro-
vides efficient removal of exhaust gases and minimizes
cylinder back pressure. The mating surface of the ex-
haust manifold and the cylinder head are machined
smooth to eliminate the need for a gasket.
All eight-cylinder engines are equipped with an Air
Guard system and have air injection manifolds attached
at number 1, 3, and 5 exhaust ports of the left exhaust
manifold and numbers 2, 4, 6, and 8 of the right exhaust
manifold (California models only). Refer to Chapter
IK—Exhaust Systems for description of the Air Guard
system.
Removal
(1) Disconnect ignition wires.
(2) Disconnect air delivery hose' at injection
manifold.
(3) Disconnect exhaust pipe at exhaust manifold.
(4) Remove exhaust manifold retaining screws.
(5) Separate exhaust manifold from cylinder head.
(6) Remove air injection manifold, attaching screws
and washers.
Installation
(1) Clean mating surfaces of exhaust manifold and
cylinder head. Do not nick or scratch.
(2) Install air injection manifold to exhaust
manifold.
(3) Install exhaust manifold and retaining screws.
Tighten two center screws to 25 foot-pounds (34 N«m)
torque. Tighten four outer screws to 15 foot-pounds (20
N®m) torque.
N O T E : The correct screws and washers must be used
to allow the manifold to expand and prevent cracking.
(4) Connect exhaust pipe using replacement seal, if
required. Tighten nuts to 20 foot-pounds (27 N®m)
torque.
(5) Connect air delivery hose to air injection
manifold.
(6) Connect ignition wires.
CYLINDER HEAD AND COVER
Cylinder H e i l Cower
The cylinder head covers are installed with a formed-
in-place RTV (room temperature vulcanizing) silicone
gasket.
Removal
(1) Remove air cleaner assembly.
(2) Disconnect air delivery hose at air injection
manifold.
(3) Left side:
(a) Disconnect power brake vacuum hose at in-
take manifold, if equipped.
(b) Disconnect throttle stop solenoid wire, if
equipped.
(4) Right side:
(a) Remove thermostatically controlled air
cleaner (TAC) hot air hose.
(b) Remove heater hose from choke cover
clamp.
(5) Disconnect ignition wires and remove plastic
wire separator from cylinder head cover bracket.
(6) Remove retaining screws and washers. Strike
cover with rubber mallet to break loose from cylinder
head. Remove cover and gasket.
Installation
(1) Inspect for bent or cracked cover and repair as
required.
(2) Clean cylinder head cover and cylinder head gas-
ket surface of original gasket material.