Ford Thunderbird Manual page 6

03-oo-5
DIAGNOSIS AND TESTING (Continued)
Condition
•
Engine Noise
•
Insufficient Power
4 Can be purchased as a separate item.
Engine-Service
ENGINE DIAGNOSIS (Continued)
Possible Source
•
Damaged cooling system.
•
Damaged fuel system.
•
Leaking exhaust system.
•
Improper drive belt tension.
•
Damaged generator bearing.
•
Damaged water pump bearing.
•
Damaged exhaust gas
recirculation (EGR) system.
•
Excessive main bearing oil
clearance.
•
Seized or heat damaged
crankshaft main bearing.
•
Excessive crankshaft end play.
•
Excessive connecting rod bearing
oil clearance.
•
Heat damaged connecting rod
bearing.
•
Worn cylinder.
•
Worn piston or piston pin.
•
Damaged piston ring(s).
•
Bent connecting rod.
•
Damaged valve tappet.
•
Excessive hydraulic valve tappet
clearance.
•
Broken valve spring.
•
Excessive valve guide clearance .
•
Loose timing chain.
•
Damaged fuel system.
•
Damaged ignition system.
•
Slipping transmission.
•
Dragging brakes .
•
Incorrect tire size .
•
Restricted exhaust system.
•
Damaged hydraulic valve tappet.
•
Damaged hydraulic valve tappet
guide.
•
Compression leakage at valve
seat.
•
Seized valve stem .
•
Weak or broken valve spring .
•
Damaged cylinder head gasket.
•
Cracked or distorted cylinder
head.
•
Damaged, worn or sticking piston
ring(s).
•
Worn or damaged piston.
Action
•
REFER to Section 03-03 .
•
REFER to the Powertrain
I
Control Emissions Diagnosis
Manual4•
•
REFER to Section 09-00 .
•
REFER to Section 03-05 .
•
REFER to Section 14-02 .
•
REFER to Section 03-03 .
•
REFER to the Powertrain
I
Control Emissions Diagnosis
Manual4•
•
REPLACE crankshaft main bearing
I
and or crankshaft.
•
REPLACE crankshaft main bearing
I
and or crankshaft.
•
REPLACE crankshaft thrust
washer (if equipped), crankshaft
I
thrust main bearing and
crankshaft.
•
REPLACE connecting rod bearing,
I
connecting rod and or crankshaft.
•
REPLACE connecting rod bearing
I
and or crankshaft.
•
SERVICE or REPLACE cylinder
blocks.
•
REPLACE connecting rod bushing .
•
REPLACE piston or piston pin .
•
REPLACE piston ring(s) .
•
REPLACE connecting rod .
•
REPLACE valve tappet.
•
ADJUST clearance or REPLACE
hydraulic valve tappet guide.
•
REPLACE valve spring .
•
SERVICE clearance or REPLACE
I
valve guide stem.
•
REPLACE timing chain.
•
REFER to the Powertrain
I
Control Emissions Diagnosis
Manual4•
•
REFER to the Powertrain
I
Control Emissions Diagnosis
Manual4•
•
REFER to Section 07-01 .
•
REFER to Section 06-00.
•
REFER to Section 04-04.
•
REFER to Section 09-00.
•
REPLACE hydraulic valve tappet.
•
REPLACE hydraulic tappet guide.
•
SERVICE or REPLACE valve, valve
I
seat and or cylinder head.
•
REPLACE valve stem.
•
REPLACE valve spring.
•
REPLACE cylinder head gasket.
•
REPLACE cylinder head.
•
SERVICE or REPLACE piston
ring(s).
•
REPLACE piston.
1997 Thunderbird, Cougar July 1996
03·00·5
or