Ford 2007 WQ Fiesta Repair Manual page 428

303-00-6 Engine System
-
General Information 303-00-6
DIAGNOSIS AND TESTING
Symptom
Possible Sources Action
Damaged gaskets or mating
surfaces.
-
Cylinder head gasket is
damaged or mating face are
warped.
-
Valve stem oil seals are
worn and engine oil can
enter the combustion
chamber between the valve
stem and the valve stem
guide.
Piston ring or cylinder liner
wear.
Damaged cylinder liners or
excessive clearance of engine
components.
-
Pistons
-
Piston rings (clearance in
groove and end gap)
-
Cylinder liners
CHECK the gaskets and
\
mating surfaces for damage.
Remove the cylinder head.
CHECK the mating faces, cylinder
head gasket and the evenness of
the cylinder head and engine
block mating faces.
INSTALL new valve seals.REFER
to:
Valve Seals (303-01 Engine
-
1.25L Duratec-1 6V
(Sigma)ll.4L Duratec-1 6V
(Sigma)/l .6L Duratec-I 6V
(Sigma), In-vehicle Repair),
Valve Seals (303-01 Engine
-
1.3L Duratec-8V (Rocam), In-
vehicle Repair),
Valve Seals (303-01 Engine
-
2.OL Duratec-HE (M14), In-
vehicle Repair),
Valve Seals (303-01 Engine
-
1.4L Duratorq-TDCi (DV)
Diesel, In-vehicle Repair),
Valve Seals (303-01 Engine
-
1.6L Duratorq-TDCi (DV)
CHECK the running surfaces
and clearances of the individual
engine components. INSTALL
new components as necessary.
INSTALL a new cylinder block
if necessary.
CHECK the pistons.
REFER to: Piston Inspection
(303-00 Engine System
-
General Information, General
Procedures).
CHECK the piston rings.
REFER to: (303-00 Engine
System
-
General Information)
Piston Ring-to-Groove Clear-
ance (General Procedures),
Piston Ring End Gap (General
Procedures).
2006.0 Fiesta
1212006 GI 52554en