engine system general information FORD FIESTA 2007 Repair Manual

303-00-31 Engine System - General Information 303-00-31
DIAGNOSIS AND TESTING
11. Connect the oil pressure switch electrical
connector to the oil pressure switch.
12 Lower the vehicle.
Valve train analysis - static (engine off)
Remove the valve cover.
Check all components of the valve train for damage
and wear. Make sure that only original components
are installed and that all nuts and bolts are
tightened to the specified torque.
2006.0 Fiesta 1212006 GI 52554en
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303-00-32 Engine System - General Information 303-00-32
GENERAL PROCEDURES
Camshaft Bearing Journal Diameter
1. Determine the diameter of the camshaft
journals.
Using a micrometer measure the diameter
at
90 degrees intervals to determine if the
journals are out-of-round.
Measure at two different points on the journal
to determine if there is any tapering.
If the measurements are out of the specified
range, install a new camshaft.
2006.0 Fiesta 1212006 GI 7620en
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303-00-33 Engine System - General Information 303-00-33
GENERAL PROCEDURES
Camshaft Bearing Journal Clearance
1. N0TE:Make sure that the following stages The value that is read off is the bearing
are followed exactly. The tappets or followers clearance.
must be removed to carry out this
measurement.
N0TE:Make sure that the camshaft is to
specification.
N0TE:The bearing caps and journals should be
free from engine oil and dirt.
Position on a width of plastigage on the
bearing cap.
Insert the camshaft, without lubrication, into
the cylinder head.
Position
a plastigage strip, which should be
equal to the width of the bearing cap, on the
bearing journal.
2. Following the tightening specification, install
the camshaft bearing caps. Refer to the
corresponding Section 303-01.
3.
N0TE:Do not strike the bearing caps.
Remove the camshaft bearing caps, refer to
the corresponding Section 303-01.
'4. Using the Plastigage, read off the
measurement.
Compare the width of plastigage with the
plastigage scale.
2006.0 Fiesta 1212006
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303-00-34 Engine System - General Information 303-00-34
GENERAL
PROCEDURES
Camshaft End Play
1. N0TE:Make sure that the camshaft is to
specification.
Using a Dial Indicator Gauge, measure the
end play.
Slide the camshaft in both directions. Read
and note the maximum and minimum values
on the Dial lndicator Gauge.
End play = maximum value minus minimum
value
If the measurement is out of specification,
install new components.
2006.0 Fiesta 1212006 GI 7622en
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303-00-35 Engine System - General Information 303-00135
GENERAL PROCEDURES
Camshaft Surface l nspection
I
I. Inspect the camshaft lobes for pitting or
damage in the active area. Minor pitting is
acceptable outside the active area.
2006.0 Fiesta 1212006 GI 7623en
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303-00-36 Engine System - General Information 303-00-36
GENERAL PROCEDURES
Camshaft Lobe Lift
1. Determine the cam lift.
Using a micrometer measure the cam in two
directions.
The difference between the two
measurements is the cam
lift.
2006.0 Fiesta 1212006 GI 7624en
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303-00-37 Engine System - General Information 303-00-37
GENERAL PROCEDURES
Crankshaft Main Bearing Journal Diameter
" General Equipment
I Micrometer I
1. Measure the diameter of the main bearing
journals and the big-end bearing journals.
Repeat the measurement with the
micrometer offset by
90°, in order to
determine any eccentricity which may be
present.
Measure the journal at two different positions
to determine any conicity which may be
present.
2006.0 Fiesta 1212006 G21023en
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303-00-38 Engine System - General Information 303-00-38
GENERAL PROCEDURES
Crankshaft End Play
General Equipment
I Dial indicator I
I Dial indicator fixture I
1. Determine the end float
Place on the dial indicator and bracket .
Determine the end float by raising the
crankshaft with the aid of a screwdriver.
If necessary, correct the end float by using
new thrust half washers.
2006.0 Fiesta 1212006 GI 7627en
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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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