between two metallic surfaces, and will rapidly cure
when heat is applied.
MOPARt GASKET SEALANT
Mopart Gasket Sealant is a slow drying, perma-
nently soft sealer. This material is recommended for
sealing threaded fittings and gaskets against leakage
of oil and coolant. Can be used on threaded and
machined parts under all temperatures. This mate-
rial is used on engines with multi-layer steel (MLS)
cylinder head gaskets. This material also will pre-
vent corrosion. Mopart Gasket Sealant is available in
a 13 oz. aerosol can or 4oz./16 oz. can w/applicator.
FORM-IN-PLACE GASKET AND SEALER
APPLICATION
Assembling parts using a form-in-place gasket
requires care but it’s easier then using precut gas-
kets.
Mopart Gasket Maker material should be applied
sparingly 1 mm (0.040 in.) diameter or less of sealant
to one gasket surface. Be certain the material sur-
rounds each mounting hole. Excess material can eas-
ily be wiped off. Components should be torqued in
place within 15 minutes. The use of a locating dowel
is recommended during assembly to prevent smear-
ing material off the location.
Mopart Engine RTV GEN II or ATF RTV gasket
material should be applied in a continuous bead
approximately 3 mm (0.120 in.) in diameter. All
mounting holes must be circled. For corner sealing, a
3.17 or 6.35 mm (1/8 or 1/4 in.) drop is placed in the
center of the gasket contact area. Uncured sealant
may be removed with a shop towel. Components
should be torqued in place while the sealant is still
wet to the touch (within 10 minutes). The usage of a
locating dowel is recommended during assembly to
prevent smearing material off the location.
Mopart Gasket Sealant in an aerosol can should be
applied using a thin, even coat sprayed completely
over both surfaces to be joined, and both sides of a
gasket. Then proceed with assembly. Material in a
can w/applicator can be brushed on evenly over the
sealing surfaces. Material in an aerosol can should be
used on engines with multi-layer steel gaskets.
ENGINE GASKET SURFACE PREPARATION
To ensure engine gasket sealing, proper surface
preparation must be performed, especially with the
use of aluminum engine components and multi-layer
steel cylinder head gaskets.
Never use the following to clean gasket surfaces:
• Metal scraper
• Abrasive pad or paper to clean cylinder block
and head
• High speed power tool with an abrasive pad or a
wire brush (Fig. 17)
NOTE: Multi-Layer Steel (MLS) head gaskets
require a scratch free sealing surface.
Only use the following for cleaning gasket surfaces:
• Solvent or a commercially available gasket
remover
• Plastic or wood scraper (Fig. 17)
• Drill motor with 3M Rolocy Bristle Disc (white
or yellow) (Fig. 17)
CAUTION: Excessive pressure or high RPM
(beyond the recommended speed), can damage the
sealing surfaces. The mild (white, 120 grit) bristle
disc is recommended. If necessary, the medium
(yellow, 80 grit) bristle disc may be used on cast
iron surfaces with care.
REPAIR OF DAMAGED OR WORN THREADS
Damaged or worn threads (excluding spark plug
and camshaft bearing cap attaching threads) can be
repaired. Essentially, this repair consists of drilling
out worn or damaged threads, tapping the hole with
a special Heli-Coil Tap, (or equivalent) and installing
an insert into the tapped hole. This brings the hole
back to its original thread size.
CAUTION: Be sure that the tapped holes maintain
the original centerline.
Heli-Coil tools and inserts are readily available
from automotive parts jobbers.
Fig. 17 Proper Tool Usage For Surface Preparation
1 – ABRASIVE PAD
2 – 3M ROLOCY BRISTLE DISC
3 – PLASTIC/WOOD SCRAPER
9 - 22 2.7L ENGINE LH
SERVICE PROCEDURES (Continued)
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