Diagnosis And Testing; Engine Diagnosis - Ford LRG-423 Service Manual

01-4
Engine Service
01-4
DIAGNOSIS AND TESTING
Inspection
1.
Inspect to determine if any of the following
mechanical concerns apply:
l
Engine oil leaks.
l
Damaged and/or severely worn parts.
l
Loose mounting bolts, studs and nuts.
Symptom Chart
ENGINE DIAGNOSIS
CONDITION
l
Difficult Starting
l
Poor Idling
l
Abnormal Combustion
l
Excessive Oil Consumption
POSSIBLE SOURCE ACTION
l
Burnt valve.
l
REPLACE valve.
l
Worn piston.
l
REPLACE piston.
l
Worn piston ring(s).
l
REPLACE piston ring(s).
l
Worn cylinder.
l
SERVICE or REPLACE cylinder
block.
l
Damaged cylinder head gasket.
l
REPLACE cylinder head gasket.
l
Malfunctioning or damaged fuel
l
REFER to section on Fuel System.
system.
l
Malfunctioning or damaged ignition
l
REFER to section on Ignition
system. System.
l
Damaged hydraulic valve tappet.
l
REPLACE hydraulic valve tappet.
l
Damaged hydraulic valve tappet
l
REPLACE hydraulic valve tappet
guide. guide.
l
Improper valve-to-valve seat
l
REPLACE valve and/or valve seat.
contact.
l
Damaged cylinder head gasket.
l
REPLACE cylinder head gasket.
l
Malfunctioning or damaged fuel
l
REFER to section on Fuel System.
system.
l
Malfunctioning or damaged ignition
l
REFER to section on Ignition
system.
System.
l
Damaged hydraulic valve tappet.
l
REPLACE hydraulic valve tappet.
l
Damaged hydraulic valve tappet
l
REPLACE cylinder block.
bore.
l
Burnt or sticking valve.
l
SERVICE or REPLACE valve.
l
Weak or broken valve spring.
l
REPLACE valve spring.
l
Carbon accumulation in
l
ELIMINATE carbon buildup.
combustion chamber.
l
Malfunctioning or damaged fuel
l
REFER to section on Fuel System.
system.
l
Malfunctioning or damaged ignition
l
REFER to section on Ignition
system. System.
l
Worn piston ring groove.
l
REPLACE piston.
l
Sticking piston ring(s).
l
SERVICE or REPLACE piston
ring(s).
l
Worn piston or cylinder.
l
SERVICE and/or REPLACE piston
or cylinder block.
l
Worn valve stem seal.
l
REPLACE valve stem seal.
l
Worn valve stem or valve guide.
l
REPLACE valve stem and guide.
l
Leaking oil.
l
SERVICE oil leakage.
l
Worn piston rings.
l
REPLACE piston rings.
l
Plugged PCV system.
l
SERVICE PCV System.