Ford 2003 Mustang Workshop Manual page 843

Component Tests
Engine Oil Leaks
NOTE: When diagnosing engine oil leaks, the source and location of the leak must be positively
identified prior to repair.
Prior to carrying out this procedure, clean all sealing surface areas with a suitable solvent to remove all
traces of oil.
Engine Oil Leaks—Fluorescent Oil Additive Method
Use the UV Leak Detector Kit to carry out the following procedure for oil leak diagnosis.
1. Add gasoline engine oil dye. Use a minimum 14.8 ml (0.5 ounce) to a maximum 29.6 ml (1
ounce) of fluorescent additive to all engines. If the oil is not premixed, fluorescent additive must
first be added to crankcase.
2. Run the engine for 15 minutes. Stop the engine and inspect all seal and gasket areas for leaks
using the UV Leak Detector Kit. A clear bright yellow or orange area will identify the leak. For
extremely small leaks, several hours may be required for the leak to appear.
Leakage Points—Underhood
Examine the following areas for oil leakage:
valve cover gaskets
Slipping
transmission.
Malfunctioning
valve tappet or lash
adjuster.
Damaged valve
tappet guide or
valve tappet.
Compression
leakage at valve
seat.
Seized valve stem.
Weak or broken
valve spring.
Worn or damaged
camshaft.
Damaged head
gasket (6051).
Cracked or
distorted cylinder
head.
Damaged, worn or
sticking piston ring
(s).
Worn or damaged
piston.
Refer to the appropriate section
in Group 307 for the procedure.
INSTALL a new valve tappet or
lash adjuster.
INSTALL a new valve tappet
guide or valve tappet.
REPAIR or INSTALL a new
valve, valve seat or cylinder
head (6049).
INSTALL a new valve.
INSTALL a new valve spring.
INSTALL a new camshaft.
INSTALL a new head gasket.
INSTALL a new cylinder head.
REPAIR or INSTALL a new
piston ring(s).
INSTALL a new piston and
piston pin.