engine FORD MUSTANG 2003 Workshop Manual

GENERAL PROCEDURES
Connecting Rod —
Large End Bore
1. Tighten the bolts to specification, then measure the bore in two directions. The difference is the connecting rod bore out-of-round. Verify the out-of- round is within specification.
z 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.
SECTION 303-
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GENERAL PROCEDURES
Connecting Rod —
Bushing Diameter
1. Measure the inner diameter of the connecting rod bushing, if equipped. Verify the diameter is within specification.
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.
SECTION 303-
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GENERAL PROCEDURES
Connecting Rod —
Bend
1. Measure the connecting rod bend on a suitable alignment fixture. Follow the instructions of the fixture manufacturer. Verify the bend measurement is within specification.
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.
SECTION 303-
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GENERAL PROCEDURES
Connecting Rod —
Twist
1. Measure the connecting rod twist on a suitable alignment fixture. Follow the instructions of the fixture manufacturer. Verify the measurement is within specification.
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.
SECTION 303-
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GENERAL PROCEDURES
Connecting Rod —
Piston Pin Side Clearance
1. Measure the clearance between the connecting rod and the piston. Verify the measurement is within specification.
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
Connecting Rod —
Bearing Journal Clearance
NOTE: The crankshaft connecting rod journals must be within specifications to check the connecting
rod bearing journal clearance.
1. Remove the connecting rod bearing cap.
2. Position a piece of Plastigage across the bearing surface.
3. NOTE: Do not turn the crankshaft during this step.
Install and tighten to specifications, then remove the connecting rod bearing cap.
4. Measure the Plastigage to get the connecting rod bearing journal clearance. The Plastigage should be smooth and flat. A changing width indicates a tapered or damaged connecting rod or
connecting rod bearing.
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.
SECTION 303-
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Plastigage
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GENERAL PROCEDURES
Connecting Rod —
Side Clearance
1. Measure the clearance between the connecting rod and the crankshaft. Verify the measurement is within specification.
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.
SECTION 303-
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GENERAL PROCEDURES
Roller Follower —
Inspection
Push rod engines 1. Inspect the roller for flat spots or scoring. If any damage is found, inspect the camshaft lobes and valve tappet for damage.
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GENERAL PROCEDURES
Valve Tappet —
Inspection
Push rod engines 1. Inspect the hydraulic valve tappet and roller for damage. If any damage is found, inspect the camshaft lobes and valves for damage.
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GENERAL PROCEDURES
Valve —
Stem Diameter
1. Measure the diameter of each intake and exhaust valve stem at the points shown. Verify the diameter is within specification.
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.
SECTION 303-
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