FORD FIESTA 2007 Workshop Manual

303-00-39 Engine System - General Information 303-00-39
GENERAL PROCEDURES
Cylinder Bore Taper
1. N0TE:The main bearing caps or lower
crankcase must be in place and tightened to
the specified torque; however, the bearing
shells should not be installed.
Measure the cylinder bore with an internal
micrometer.
Carry out the measurements in different
directions and at different heights to
determine if there is any out-of-roundness or
tapering.
If the measurement is out of the specified
range, install a new block or hone out the
cylinder block (if
aplicable/allowed).
2006.0 Fiesta 1212006 GI 7628en
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303-0040 Engine System - General Information 303-00-40
GENERALPROCEDURES
Piston l nspection
- ACAUTION:D~ not use any aggressive
cleaning fluid or a wire brush to clean the
piston.
Carry out a visual inspection.
Clean the piston skirt, pin bush, ring grooves
and crown and check for wear or cracks.
If there are signs of wear on the piston skirt,
check whether the connecting rod is twisted
or bent.
2006.0 Fiesta 1212006 GI 7629en
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303-0041 Engine System - General Information 303-00-41
GENERAL PROCEDURES
Piston Pin to Bore Diameter
1. N0TE:The piston and piston pin form a
matched pair. Do not mix up the
components.
Measure the diameter of the piston pin bore.
Measure the diameter in two directions.
If the values are not to specification, install
both a new piston and a new piston pin.
2006.0 Fiesta 1212006 GI 7630en
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303-00-42 Engine System - General Information 303-0042
GENERAL PROCEDURES
Piston Diameter
General Equipment
I Micrometer I
1. N0TE:Mark the piston to make sure the
piston is installed correctly.
Using a Micrometer measure the piston
diameter.
2006.0 Fiesta 1212006 GI 7631 en
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303-00-43 Engine System - General Information 303-00-43
GENERAL PROCEDURES
Piston Ring End Gap

~CAUTION:DO not mix up the piston rings.
Install the piston rings in the same position
and location.
Take the piston ring and use
a piston without
rings to push the piston ring about
30 mm
into the cylinder bore.
2. Using the Feeler Gauge, measure the piston
ring gap.
2006.0 Fiesta 1212006 GI 7632en
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303-0044 Engine System - General Information 303-00-44 ,
GENERAL PROCEDURES
Piston Ring-to-Groove Clearance
General Equipment
I Feeler Gauge I
I. N0TE:The piston ring must protrude from
the piston groove. To determine the piston
ring clearance, insert the Feeler Gauge right
to the back of the groove, behind the wear
ridge.
Using the Feeler Gauge, measure the piston
ring clearance.
2006.0 Fiesta 1212006 GI 7633en
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303-0045 Engine System - General Information 303-00-45
GENERAL PROCEDURES
Piston Pin Diameter
I. N0TE:The piston and piston pin are a
matched pair. Do not mix up the
components.
Measure the piston pin diameter.
Measure the diameter in two directions.
If the values are not to specification, install
a new piston and a new piston pin.
2006.0 Fiesta i~12006 GI 7634en
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303-00-46 Engine System - General Information 303-00-46
GENERALPROCEDURES
Connecting Rod Large End Bore
1. Measure the bearing bore in two directions.
The difference is the connecting rod bore
out-of-round. Verify the out-of-round and the
bearing bore is within specification.
2006.0 Fiesta 1212006 GI 7635en
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303-0047 Engine System - General Information 303-00-47
GENERALPROCEDURES
Valve Stem Diameter
I. Using a micrometer measure the diameter
of the valve stems.
If the measurements are not to specification,
install a new valve.
2006.0 Fiesta 1212006 GI 7636en
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303-0048 Engine System - General Information 303-00-48
GENERAL PROCEDURES
Flywheel Inspection
1. Inspect the flywheel. If there is evidence of
the following, install a new flywheel.
1. Cracks.
2. Worn ring gear teeth.
3. Chipped or cracked ring gear teeth.
2006.0 Fiesta la2006 GI 7637en
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