Ford Aerostar 1997 Workshop Manual page 10

1997 Aerostar/Ranger
Section 03-01C: Engine, 4.0L V-6
IN-VEHICLE SERVICE
Valve Spring, Retainer and Valve Stem Seal
SPECIAL SERVICE TOOL(S) REQUIRED
Description
Valve Spring Compressor
Valve Spring Compressor Bar T74P-6565-B
Valve Stem Seal Replacer
NOTE: Broken valve springs (6513) or leaking valve stem seals (6571) and retainer may be replaced
without removing the cylinder head (6049), provided damage to the intake valve (6507) or valve seat
has not occurred.
Removal
1. Remove the valve cover (6582) and valve rocker arm shaft (6563) as described under
Aerostar or Valve Cover, Ranger and
2. Remove both push rods (6565) and valve tappets (6500) of the cylinder to be serviced.
3. CAUTION: Engine may turn over when air pressure is applied. Remove all objects from
fan area (lights, extension cords, etc.).
Install an air line with an adapter in the spark plug hole.
4. NOTE: If air pressure fails to hold the valve in the closed position when removing retainers, it
can be presumed that the intake valve is not seating or is damaged. If this condition occurs,
remove the cylinder head for further inspection.
Turn on the air supply. Air pressure may turn the crankshaft until the piston reaches the bottom
of the stroke.
5. Using the Valve Spring Compressor T86L-6565-A and Valve Spring Compressor Bar T74P-6565-B
compress the valve spring and remove the valve spring retainer keys (6518), valve spring retainer
(6514) and the valve spring.
6. Remove the valve stem seal. If air pressure has forced the piston to the bottom of the cylinder, any
removal of air pressure will allow the intake valves or exhaust valves (6505) to fall into the cylinder. A
rubber band, tape or string wrapped around the end of the valve stem will prevent this condition and
will still allow enough travel to check the intake valve or exhaust valve for binds.
Installation
1. Lubricate a new valve stem seal with engine oil XO-5W30-QSP or equivalent meeting Ford
specification WSE-M2903-A1 or SAE 5W-30 Service SG and install on valve stem using Valve Stem
Seal Replacer T90T-6571-A.
2. Position the rocker arm shaft spring (6587) over the intake valve or exhaust valve. Install the valve
spring retainer. Using Valve Spring Compressor Bar T74P-6565-B and Valve Spring Compressor
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVK31C15.HTM~gen~ref.HTM
Tool Number
T86L-6565-A
T90T-6571-A
Rocker Arm . Remove the applicable spark plug (12405).
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1997 Aerostar, Ranger Workshop Manual
Page 1 of 3
Valve Cover,
2011-04-27