Ford LRG-423 User 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.

Ford LRG-423 Specifications

General

Brand	Ford
Model	LRG-423
Category	Engine
Language	English