Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Jeep Cherokee XJ 1997.1999-2001 Approved 1999 XJ Jeep Cherokee EXJ_9

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EXJ_9


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XJ                                                                                                                                                         ENGINE        9-1



                                                                                             ENGINE
                                                                                             CONTENTS

                                                                                                 page                                                                    page

2.5L ENGINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15                                       ENGINE DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . 8
4.0L ENGINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56                                       STANDARD SERVICE INFORMATION . . . . . . . . . . 1



                             STANDARD SERVICE INFORMATION

                                                                                                         INDEX
                                                                                                 page                                                                    page

GENERAL INFORMATION                                                                                              HYDROSTATIC LOCK . . . . . . . . . . . . . . .       ...... 4
 ENGINE OIL SERVICE . . . . .            .   .   .   .   .   .   .   .   .   .   .   .   .   .   .   .   4       MEASURING WITH PLASTIGAGE . . . . . .                ...... 3
 ENGINE PERFORMANCE . .                  .   .   .   .   .   .   .   .   .   .   .   .   .   .   .   .   2       REPAIR DAMAGED OR WORN THREADS                       ...... 4
 FORM-IN-PLACE GASKETS .                 .   .   .   .   .   .   .   .   .   .   .   .   .   .   .   .   1       SERVICE ENGINE ASSEMBLY
 HONING CYLINDER BORES                   .   .   .   .   .   .   .   .   .   .   .   .   .   .   .   .   2        (SHORT BLOCK) . . . . . . . . . . . . . . . . . .   ...... 4

GENERAL INFORMATION                                                                                          MOPAR GASKET MAKER
                                                                                                               Mopar Gasket Maker, normally red in color, is
FORM-IN-PLACE GASKETS                                                                                        available in 6 cc tubes. This anaerobic type gasket
   There are several places where form-in-place gas-                                                         material cures in the absence of air when squeezed
kets are used on the engine. DO NOT use form-in-                                                             between smooth machined metallic surfaces. It will
place gasket material unless specified. Care                                                                 not cure if left in the uncovered tube. DO NOT use
must be taken when applying form-in-place gaskets.                                                           on flexible metal flanges.
Bead size, continuity and location are of great impor-
tance. Too thin a bead can result in leakage while too                                                       SURFACE PREPARATION
much can result in spill-over. A continuous bead of                                                            Parts assembled with form-in-place gaskets may be
the proper width is essential to obtain a leak-free                                                          disassembled without unusual effort. In some
joint.                                                                                                       instances, it may be necessary to lightly tap the part
   Two types of form-in-place gasket materials are                                                           with a mallet or other suitable tool to break the seal
used in the engine area (Mopar Silicone Rubber                                                               between the mating surfaces. A flat gasket scraper
Adhesive Sealant and Mopar Gasket Maker). Each                                                               may also be lightly tapped into the joint but care
have different properties and cannot be used inter-                                                          must be taken not to damage the mating surfaces.
changeably.                                                                                                    Scrape or wire brush all gasket surfaces to remove
                                                                                                             all loose material. Inspect stamped parts to ensure
MOPAR SILICONE RUBBER ADHESIVE SEALANT                                                                       gasket rails are flat. Flatten rails with a hammer on
   Mopar Silicone Rubber Adhesive Sealant, normally                                                          a flat plate, if required. Gasket surfaces must be free
black in color, is available in 3 ounce tubes. Moisture                                                      of oil and dirt. Make sure the old gasket material is
in the air causes the sealant material to cure. This                                                         removed from blind attaching holes.
material is normally used on flexible metal flanges.
It has a shelf life of a year and will not properly cure                                                     GASKET APPLICATION
if over aged. Always inspect the package for the expi-                                                          Assembling parts using a form-in-place gasket
ration date before use.                                                                                      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
9-2      ENGINE                                                                                              XJ
GENERAL INFORMATION (Continued)
inch) drop is placed in the center of the gasket con-      taper and out-of-round as well as removing light
tact area. Uncured sealant may be removed with a           scuffing, scoring or scratches. Usually a few strokes
shop towel. Components should be torqued in place          will clean up a bore and maintain the required lim-
while the sealant is still wet to the touch (within 10     its.
minutes). The use of a locating dowel is recom-
mended during assembly to prevent smearing the             CAUTION: DO NOT use rigid type hones to remove
material off location.                                     cylinder wall glaze.
  Mopar Gasket Maker should be applied sparingly
to one gasket surface. The sealant diameter should           (2) Deglazing of the cylinder walls may be done if
be 1.00 mm (0.04 inch) or less. Be certain the mate-       the cylinder bore is straight and round. Use a cylin-
rial surrounds each mounting hole. Excess material         der surfacing hone, Honing Tool C-3501, equipped
can easily be wiped off. Components should be              with 280 grit stones (C-3501-3810). 20-60 strokes,
torqued in place within 15 minutes. The use of a           depending on the bore condition, will be sufficient to
locating dowel is recommended during assembly to           provide a satisfactory surface. Using honing oil
prevent smearing the material off location.                C-3501-3880 or a light honing oil available from
                                                           major oil distributors.
ENGINE PERFORMANCE                                         CAUTION: DO NOT use engine or transmission oil,
   It is important that the vehicle is operating to its    mineral spirits or kerosene.
optimum performance level to maintain fuel economy
and the lowest emission levels. If vehicle is not oper-      (3) Honing should be done by moving the hone up
ating to these standards, refer to Engine Diagnosis        and down fast enough to get a crosshatch pattern.
outlined in this section. The following procedures can     The hone marks should INTERSECT at 50



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