03-oo-5
Engine-Service
03·00·5
DIAGNOSIS AND TESTING (Continued)
ENGINE DIAGNOSIS (Continued)
Condition
Possible Source
Action
•
Engine Noise
•
Damaged cooling system.
•
REFER to Section 03-03 .
•
Damaged fuel system.
•
REFER to the Powertrain
Control
I
Emissions Diagnosis
Manual4•
•
Leaking exhaust system.
•
REFER to Section 09-00 .
•
Improper drive belt tension.
•
REFER to Section 03-05 .
•
Damaged generator bearing.
•
REFER to Section 1 4-02 .
•
Damaged water pump bearing.
•
REFER to Section 03-03 .
•
Damaged exhaust gas
•
REFER to the Powertrain
recirculation (EGR) system.
Control
I
Emissions Diagnosis
Manual4•
•
Excessive main bearing oil
•
REPLACE crankshaft main bearing
clearance.
and
I
or crankshaft.
•
Seized or heat damaged
•
REPLACE crankshaft main bearing
crankshaft main bearing.
and
I
or crankshaft.
•
Excessive crankshaft end play.
•
REPLACE crankshaft thrust
washer (if equipped), crankshaft
thrust main bearing and
I
or
crankshaft.
•
Excessive connecting rod bearing
•
REPLACE connecting rod bearing,
oil clearance.
connecting rod and
I
or crankshaft.
•
Heat damaged connecting rod
•
REPLACE connecting rod bearing
bearing.
and
I
or crankshaft.
•
Worn cylinder.
•
SERVICE or REPLACE cylinder
blocks.
•
REPLACE connecting rod bushing .
•
Worn piston or piston pin.
•
REPLACE piston or piston pin .
•
Damaged piston ring(s).
•
REPLACE piston ring(s) .
•
Bent connecting rod.
•
REPLACE connecting rod .
•
Damaged valve tappet.
•
REPLACE valve tappet.
•
Excessive hydraulic valve tappet
•
ADJUST clearance or REPLACE
clearance.
hydraulic valve tappet guide.
•
Broken valve spring.
•
REPLACE valve spring .
•
Excessive valve guide clearance .
•
SERVICE clearance or REPLACE
valve guide
I
stem.
•
Loose timing chain.
•
REPLACE timing chain.
•
Insufficient Power
•
Damaged fuel system.
•
REFER to the Powertrain
Control
I
Emissions Diagnosis
Manual4•
•
Damaged ignition system.
•
REFER to the Powertrain
Control
I
Emissions Diagnosis
Manual4•
•
Slipping transmission.
•
REFER to Section 07-01 .
•
Dragging brakes .
•
REFER to Section 06-00.
•
Incorrect tire size .
•
REFER to Section 04-04.
•
Restricted exhaust system.
•
REFER to Section 09-00.
•
Damaged hydraulic valve tappet.
•
REPLACE hydraulic valve tappet.
•
Damaged hydraulic valve tappet
•
REPLACE hydraulic tappet guide.
guide.
•
Compression leakage at valve
•
SERVICE or REPLACE valve, valve
seat.
seat and
I
or cylinder head.
•
Seized valve stem .
•
REPLACE valve stem.
•
Weak or broken valve spring .
•
REPLACE valve spring.
•
Damaged cylinder head gasket.
•
REPLACE cylinder head gasket.
•
Cracked or distorted cylinder
•
REPLACE cylinder head.
head.
•
Damaged, worn or sticking piston
•
SERVICE or REPLACE piston
ring(s).
ring(s).
•
Worn or damaged piston.
•
REPLACE piston.
4 Can be purchased as a separate item.
1997
Thunderbird, Cougar
July 1996