Ford Thunderbird Manual page 21

03-oo-20
SERVICE PROCEDURES (Continued)
CAUTION: Push or drive the plug into the
machined bore using a properly designed tool. Do
not drive the plug using a tool that contacts the
crowned portion of the plug. This will expand the
plug prior to installation and may damage the
plug and/or plug bore.
NOTE: If the core plug replacing tool has a depth
seating surface, do not seat the tool against a
non-machined (casting) surface.
CAUTION: Pull the plug into the machined bore by
using a properly designed tool. Under no
circumstances is the plug to be driven into the
bore using a tool that contacts the flange. This
will damage the sealing edge and will result in
leakage and/or plug blowout.
When installed, the trailing (maximum) diameter must
be below the chamfered edge of the bore to effectively
seal the plugged bore.
D
EXPANSION TYPE PLUG
Crankshaft Main and Connecting Rod
Bearings
CAUTION: Do not scrape gum or varnish deposits
from the bearing shells or damage to bearings
may occur.
Cleaning
Identify reusable bearings so they can be installed in
their original locations.
Clean the bearing and caps thoroughly in solvent and
dry them with compressed air.
Inspection
Inspect each bearing carefully. Replace bearings that
have scored, chipped or worn surfaces. Typical
examples of unsatisfactory bearings and their causes
are shown in the following illustration. The copper lead
bearing base may be visible through the bearing
overlay. If the base showing is less than 20 percent of
the total area, the bearing is not excessively worn. It is
not necessary to replace the bearing if the bearing
clearance is within recommended limits. Check the
clearance of bearings that appear to be satisfactory
with Plastigage 081 L-6002-8 or equivalent as
described.
Engine-Service
SEALING
EDGE
BEFORE
INSTALL.A TION
EXPANSION TYPE CORE
PLUG REPLACER TOOL
A23319-A
SURFACE CRACKS,
CRATERS OR POCKETS
FATIGUE FAILURE
DIRT IMBEDDED
INTO BEARING MATERIAL
SCRATCHED BY DIRT
RADIUS RIDE.
EDGE LOADING
Crankshaft Main or Connecting Rod
Bearings-Fitting
Plastigage Method
1. Clean crankshaft journals. Inspect journals and
thrust faces for nicks, burrs or roughness that
would cause premature bearing wear.
2. CAUTION: Do not position jack under
crankshaft pulley (63 1 2). Crankshaft post
damage will result.
If fitting crankshaft main bearing (6333) in
vehicle, position a jack under counterweight
adjoining crankshaft main bearing which is being
checked. Support crankshaft (6303) with jack
its weight will not compress Plastigage
081 L -6002-B or equivalent and provide an
erroneous reading.
1 997 Thunderbird, Cougar July 1 996
03-0G-20
BRIGHT (POLISHED)
SECTIONS
IMPROPER SEAnNG
SURFACE TORN
OR SMEARED
LACK OF OIL OR
IMPROPER CLEARANCE
A8509-D
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