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TJ
GENERAL INFORMATION
ENGINE
CONTENTS
page
2 .5L ENGINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
ENGINE DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . 8
4.OL ENGINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
STANDARD SERVICE INFORMATION . . . . . . . . . . 1
STANDARD SERVICE INFORMATION
GENERAL INFORMATION
ENGINE OIL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
ENGINE PERFORMANCE . . . . . . . . . . . . . . . . . . 2
FORM-IN-PLACE GASKETS . . . . . . . . . . . . . . . . . 1
HONING CYLINDER BORES . . . . . . . . . . . . . . . . 2
INDEX
page
FORM-IN-PLACE GASKETS
There are several places where form-in-place gas-
kets are used on the engine . DO NOT use form-in-
place gasket material unless specified . Care
must be taken when applying form-in-place gaskets.
Bead size, continuity and location are of great impor-
tance . Too thin a bead can result in leakage while too
much can result in spill-over . A continuous bead of
the proper width is essential to obtain a leak-free
joint.
Two types of form-in-place gasket materials are
used in the engine area (Mopar Silicone Rubber
Adhesive Sealant and Mopar Gasket Maker). Each
have different properties and cannot be used inter-
changeably.
MOPAR SILICONE RUBBER ADHESIVE
SEALANT
Mopar Silicone Rubber Adhesive Sealant, normally
black in color, is available in 3 ounce tubes. Moisture
in the air causes the sealant material to cure . This
material is normally used on flexible metal flanges.
It has a shelf life of a year and will not properly cure
if over aged. Always inspect the package for the expi-
ration date before use .
ENGINE
9-1
page
page
HYDROSTATIC LOCK . . . . . . . . . . . . . . . . . . . . . 4
MEASURING WITH PLASTIGAGE . . . . . . . . . . . . 3
REPAIR DAMAGED OR WORN THREADS . . . . . . 4
SERVICE ENGINE ASSEMBLY
(SHORT BLOCK) . . . . . . . . . . . . . . . . . . . . . . . . 4
MOPAR GASKET MAKER
Mopar Gasket Maker, normally red in color, is
available in 6 cc tubes. This anaerobic type gasket
material cures in the absence of air when squeezed
between smooth machined metallic surfaces . It will
not cure if left in the uncovered tube . DO NOT use
on flexible metal flanges.
SURFACE PREPARATION
Parts assembled with form-in-place gaskets may be
disassembled
without
unusual
effort .
In
some
instances, it may be necessary to lightly tap the part
with a mallet or other suitable tool to break the seal
between the mating surfaces . A flat gasket scraper
may also be lightly tapped into the joint but care
must be taken not to damage the mating surfaces .
Scrape or wire brush all gasket surfaces to remove
all loose material . Inspect stamped parts to ensure
gasket rails are flat . Flatten rails with a hammer on
a flat plate, if required . Gasket surfaces must be free
of oil and dirt. Make sure the old gasket material is
removed from blind attaching holes.
GASKET APPLICATION
Assembling parts using a form-in-place gasket
requires care.
Mopar Silicone Rubber Adhesive Sealant should be
applied in a continuous bead approximately 3 mm
(0 .12 inch) in diameter. All mounting holes must be
circled. For corner sealing, a 3 or 6 mm (1/8 or 1/4
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