Form-In-Place Gaskets - Jeep cherokee 2000 Service Manual

9 - 86 4.0L ENGINE
SERVICE PROCEDURES (Continued)
Crankshaft Journal #7 Only
Color Code
Yellow
Orange
Blue
Green
Red

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.
MOPAR GASKET MAKER
Mopar Gasket Maker, normally red in color, is
available in 6 cc tubes. This anaerobic type gasket
Diameter
63.4873 - 63.4746 mm
(2.4995 - 2.4990 in.)
63.4746 - 63.4619 mm
(2.4996 - 2.4991 in.)
0.0127 mm (0.0005 in.)
Undersize
63.4619 - 63.4492 mm
(2.4985 - 2.4980 in.)
0.0254 mm (0.001 in.)
Undersize
63.4492 - 63.4365 mm
(2.4980 - 2.4975 in.)
0.0381 mm (0.0015 in.)
Undersize
63.2333 - 63.2206 mm
(2.4895 - 2.4890 in.)
0.254 mm (0.010 in.)
Undersize
Corresponding Bearing Insert
Upper Insert Size
Yellow - Standard
Yellow - Standard
Blue - Undersize
0.025 mm (0.001 in.)
Blue - Undersize
0.025 mm (0.001 in.)
Red - Undersize
0.254 mm (0.010 in.)
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
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
inch) drop is placed in the center of the gasket con-
Lower Insert Size
Yellow - Standard
Blue - Undersize
0.025 mm (0.001 in.)
Blue - Undersize
0.025 mm (0.001 in.)
Green - Undersize
0.051 mm (0.002 in.)
Red - Undersize
0.254 mm (0.010 in.)
unusual effort. In
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