Chrysler 2000 LHS Owner's Manual page 974

LH
SERVICE PROCEDURES (Continued)
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
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 Roloc
or yellow) (Fig. 17)
CAUTION: Excessive
(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.
Fig. 17 Proper Tool Usage For Surface Preparation
1 – ABRASIVE PAD
2 – 3M ROLOC BRISTLE DISC
3 – PLASTIC/WOOD SCRAPER
(MLS) head gaskets
Bristle Disc (white
pressure or high
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.
CYLINDER BORE—HONING
(1) Used carefully, the cylinder bore resizing hone,
recommended tool C-823 or equivalent, equipped
with 220 grit stones, is the best tool for this honing
procedure. In addition to deglazing, it will reduce
taper and out-of-round as well as removing light
scuffing, scoring or scratches. Usually a few strokes
will clean up a bore and maintain the required lim-
its.
(2) Deglazing of the cylinder walls may be done
RPM
using a cylinder surfacing hone, recommended tool
C-3501 or equivalent, equipped with 280 grit stones,
if the cylinder bore is straight and round. 20–60
strokes depending on the bore condition, will be suf-
ficient to provide a satisfactory surface. Inspect cyl-
inder walls after each 20 strokes, using a light
honing oil. Do not use engine or transmission oil,
mineral spirits or kerosene.
(3) Honing should be done by moving the hone up
and down fast enough to get a cross-hatch pattern.
When hone marks intersect at 50-60 degrees, the
cross hatch angle is most satisfactory for proper seat-
ing of rings (Fig. 18).
(4) A controlled
200–300 RPM is necessary to obtain the proper cross-
hatch angle. The number of up and down strokes per
minute can be regulated to get the desired 50–60
degree angle. Faster up and down strokes increase
the cross-hatch angle.
(5) After honing, it is necessary that the block be
cleaned again to remove all traces of abrasive.
CAUTION: Ensure all abrasives are removed from
engine parts after honing. It is recommended that a
solution of soap and hot water be used with a
brush and the parts then thoroughly dried. The bore
can be considered clean when it can be wiped
clean with a white cloth and cloth remains clean.
Oil the bores after cleaning to prevent rusting.
3.2/3.5L ENGINE
hone motor speed
9 - 93
between