SERVICE MANUAL
MANIFOLDS
Section 2
GENERAL
INTAKE MANIFOLD
The intake manifold, located on the left side of the
engine, serves as a passage for filtered air to enter the
combustion chamber. Manifold design and configuration
varies with application (Turbocharger vs. naturally
aspirated).
EXHAUST MANIFOLD
The exhaust manifold, mounted on the right side of the
engine, contains six passages which remove exhaust
gases from each cylinder.
Air flows through the intake manifold (with the boost of a
Turbocharger on some engine models) into the cylinder
head combustion chamber. By special cylinder head
design the air swirls to bring about high turbulent air-to
fuel mixing.
Correct torque values are necessary when installing
manifolds so efficient fuel-air mixing results.
PATCH
TYPE
INTAKE
MANIFOLD
MOUNTING
BOLTS
A prevailing torque type bolt with plastic patch (Fig. 2)
has replaced the standard intake manifold mounting
bolt. The new patch type bolt provides a more secure
retention with the intake manifold and cylinder head.
In the event of intake manifold repair, the standard type
bolt should be replaced by the patch type bolt.
IMPORTANT: Refer to appropriate parts catalog for
the particular application when ordering bolts so the
correct length(s) are obtained.
SPECIFICATIONS
Intake Manifold bolt
Torque Data
.......................................... 27 N•m
(20 Ibf-ft)
Exhaust Manifold Nut
Torque Data .......................................... 77 N•m
(57 Ibf-ft)
Exhaust Manifold
Flange Thickness ................................19.05 mm
(.75 in)
Other specifications are not applicable for service.
INTERCOOLER
The intercooler is a heat exchanger that removes heat
generated by compression of air in the turbocharger and
transfers the heat to the cooling system. Cooling the air
intake charge reduces the formation of oxides of
nitrogen. Use of such a device enables certain engines
to meet California Emission Standards.
Figure 2. - Patch Type Bolt
1.
Bolt
2.
Plastic Patch
CGES-185-3
PRINTED IN UNITED STATES OF AMERICA
Page 2
