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03-0o-6
Engine-Service
03-oo-6
SERVICE PROCEDURES
Positive Crankcase Ventilation (PCV)
System, Closed-Type
CAUTION: The removal of the positive crankcase
ventilation (PCV) system from the engine will
adversely affect the fuel economy and engine
ventilation as well as shorten engine life.
A malfunctioning closed positive crankcase ventilation
system may be indicated by loping or rough engine
idle. Do not compensate for this condition by
disconnecting the crankcase ventilation system and
making an idle speed adjustment. To determine
whether the loping or rough idle condition is caused by
a malfunctioning crankcase ventilation {PCV) system,
refer to the Powertrain Control
I
Emissions Diagnosis
Manual.5
Engine Oil Leaks
NOTE: When diagnosing engine oil leaks, the source
and location of the leak must be positively identified
prior to service.
The following procedure is very effective and requires
only a minimum of equipment. Prior to using this
procedure, clean the cylinder blocks {6010), cylinder
heads (6049), valve covers {6582), oil pan {6675) and
flywheel {6375) with a suitable solvent to remove all
traces of oil.
Use Rotunda 12 Volt Master UV Diagnostic Kit
164-R0756 or equivalent to perform the following
procedure for oil leak diagnosis.
12 VOLT MASTER
UV DIAGNOSTIC KIT
164- R0756
AA0873-A
Fluorescent Oil Additive Method
1 . Clean engine with a suitable solvent to remove all
traces of oil.
2. Drain engine oil crankcase and refill with
recommended oil, premixed with Rotunda
Fluorescent Oil Additive 1 64-R3705 or equivalent
meeting Ford specification ESE-M99C 103-A.
Use a minimum 14.8 ml {0.5 ounce) to a maximum
29.6 ml { 1 ounce) of fluorescent additive to all
engines. If oil is not premixed, fluorescent additive
must first be added to crankcase.
5 Can be purchased as a separate item.
3.
Run engine for 15 minutes. Stop engine and
inspect all seal and gasket areas for leaks using
Rotunda Oil Leak Detector 1 64-R0756 or
equivalent. A clear bright yellow or orange area
will identify leak. For extremely small leaks,
several hours may be required for the leak to
appear.
4. If necessary, pressurize main oil gallery system
to locate leaks due to improperly sealed, loose or
cocked plugs, If flywheel bolts leak oil, look for
sealer on threads.
5.
Service all leaks as required.
Pressure Method
The crankcase can be pressurized to locate oil leaks.
The following materials are required to fabricate the
tool to be used:
•
air supply and air hose
•
air pressure gauge that registers pressure in 4 kPa
{ 1 psi) increments
•
air line shut-off valve
•
appropriate fittings to attach above parts to oil fill,
PCV grommet hole and crankcase ventilation tube
{6758)
•
appropriate plugs to seal any openings leading to
crankcase
•
a solution of liquid detergent and water to be applied
with a suitable applicator such as a squirt bottle or
brush
Fabricate the air supply hose to include the air line
shutoff valve and the appropriate adapter to permit
the air to enter the engine through the crankcase
ventilation tube. Fabricate the air pressure gauge to a
suitable adapter for installation on the engine at the oil
filler opening.
Testing Procedure
1 . Open air supply valve until pressure gauge
maintains 34 kPa {5 psi).
2.
Inspect sealed and
I
or gasketed areas for leaks
by performing Snoop leak detector or applying a
solution of liquid detergent and water over areas
for formation of bubbles which indicates leakage.
Leakage Points
Examine the following areas for oil leakage:
Underhood
•
valve cover gaskets {6584)
•
intake manifold gaskets {946 1 )
•
cylinder head gaskets {605 1)
•
oil bypass filter{67 14)
•
oil filter adapter {688 1)
•
engine front cover {601 9)
•
oil pump and filter body {6603) {3.8L engine)
1997
Thunderbird, Cougar July
1996