FORD MUSTANG 2003 Workshop Manual

GENERAL PROCEDURES
Crankshaft —
Connecting Rod Journal Taper, Out of Round
1. Measure the crankshaft connecting rod journal diameters in two directions perpendicular to one another at each end of the connecting rod journal. The difference in the measurements from
one end to the other is the taper. Verify measurement is within the wear limit.
zRefer to the appropriate section in Group 303 for the procedure.
z If out of specification, install new components as necessary. Refer to the appropriate
section in Group 303 for the procedure.
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GENERAL PROCEDURES
Cylinder Bore —
Taper
1. Measure the cylinder bore at the top, middle, and bottom of piston ring travel in two directions as indicated. Verify the cylinder bore is within the wear limit. The difference indicates the
cylinder bore taper. Bore the cylinder to the next oversize.
zRefer to the appropriate section in Group 303 for the procedure.
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GENERAL PROCEDURES
Cylinder Bore —
Out-of-Round
1. Measure the cylinder bore in two directions. The difference is the out-of- round. Verify the out-of-
round is within the wear limit and bore the cylinder to the next oversize limit.
zRefer to the appropriate section in Group 303 for the procedure.
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GENERAL PROCEDURES
Piston Inspection
CAUTION: Do not use a caustic cleaning solution or a wire brush to clean the pistons or
damage can occur.
1. Clean and inspect the (1) ring lands, (2) skirts, (3) pin bosses, and the (4) tops of the pistons. If wear marks, scores or glazing is found on the piston skirt, check for a bent or twisted
connecting rod.
2. Use the Piston Ring Groove Scraper to clean the piston ring grooves. zMake sure the oil ring holes are clean.
SECTION 303-
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Scraper, Piston Ring Groove
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GENERAL PROCEDURES
Piston —
Pin to Bore Diameter
1. WARNING: Cover the end of the pin bore with a hand or shop rag when removing
the retainer ring, since it has a tendency to spring out. Wear eye protection.
NOTE: Piston and piston pins are a matched set and should not be interchanged.
Measure the piston pin bore diameter in two directions on each side. Verify the diameter is
within specification. zIf out of specification, install new components as necessary. Refer to the appropriate
section in Group 303 for the procedure.
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GENERAL PROCEDURES
Piston —
Diameter
1. Measure the piston diameter 90 degrees from the piston pin at the point indicated. Refer to the appropriate section in Group 303 for the procedure.
z If out of specification, install new components as necessary. Refer to the appropriate
section in Group 303 for the procedure.
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GENERAL PROCEDURES
Piston —
to Cylinder Bore Clearance
1. Subtract the piston diameter from the cylinder bore diameter to find the piston- to-cylinder bore
clearance.
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GENERAL PROCEDURES
Piston —
Selection
NOTE: The cylinder bore must be within the specifications for taper and out-of- round before fitting a
piston.
1. Select a piston size based on the cylinder bore.
2. NOTE: For precision fit, new pistons are divided into three categories within each size range
based on their relative position within the range. A paint spot on the new pistons indicates the
position within the size range.
Choose the piston with the correct paint color.
zRefer to the appropriate section in Group 303 for the procedure.
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