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03-0G-22
Engine-Service
03-0G-22
SERVICE PROCEDURES (Continued)
2.
Pry against No.
2
main bearing cap and check
crankshaft end play in both directions as shown.
PRYBAR
NOTE: PRY CRANKSHAFT IN
DIRECTION OF ARROWS AND
NOTE TOTAL END PLAY
AA1008-A
3.
If
end play exceeds the wear limit as described in
Section
03-Q 1
A (3.8L) or
03-018
(4.6L) under
Specifications, grind the crankshaft and install an
oversize crankshaft thrust main bearing
(6337)
or replace crankshaft and crankshaft thrust main
bearing.
Crankshaft Main Journal and Connecting Rod
Journals
Inspect the main journal and connecting rod journal
diameters. Measure the diameter of each journal at
two different points in the directions as shown:
JOURNAL
A14474-A
If a main journal or connecting rod journal diameter is
less than the specifications as listed in Section
03-Q 1
A
(3.8L) or Section
03-Q18
(4.6L), grind the journal to
match an undersize bearing.
Journals, Refinishing
Dress minor imperfections such as scores, nicks or
burrs with an oil stone. If the journals are severely
marred or exceed the service limit, refinish to size for
the next undersize bearing.
If
required, machine the journals to give the proper
clearance with the next undersize bearing.
If
the
journals will not clean up to maximum undersize
bearing available, replace the crankshaft.
Always reproduce the
same
journal shoulder radius
which existed originally. Too small a radius will result in
fatigue failure of the crankshaft. Too large a radius will
result in bearing failure due to radius ride
of
the
bearing.
After refinishing the journals, chamfer the oil holes.
Polish the journal with a No. 500 grit polishing cloth
and engine oil (crocus cloth may also be used) to
obtain a smooth finish. Remove all grinding dust from
oil passages with compressed air.
Crankshaft Sprocket
CAUTION: Handle crankshaft sprocket (6306)
with care to avoid possible damage to the
finished surfaces.
Inspect crankshaft sprocket for nicks, burrs or
roughness that would cause premature wear.
If
crankshaft sprocket is worn or damaged, replace
crankshaft sprocket as described in Section
03-Q 1
A
(3.8L) or Section
03-018
(4.6L).
Pistons, Piston Pins and Piston Rings
Cleaning
CAUTION: Do not use a caustic cleaning solution
or a wire brush to clean pistons (61 08) or damage
may occur.
Using a gasket scraper, remove deposits from the
piston surfaces. Clean gum or varnish from the piston
skirt, piston pins (61 35) and piston rings with solvent.
A15056-A
Clean the piston ring grooves with Piston Ring Groove
Cleaner 081 L -6002-D or equivalent or a broken piston
ring. Make sure oil ring slots (or holes) are clean.
PISTON RING GROOVE
CLEANER
081 L-6002-D
A15059-C
1997 Thunderbird, Cougar July 1 996
Содержание Thunderbird
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