Section 03-01B: Engine, 5.0L and 5.8L MFI
1996 F-150, F-250, F-350 and Bronco Vehicles Equipped with 5.0L or 5.8L MFI Engines Workshop Manual
IN-VEHICLE SERVICE

Valve Spring, Retainer and Valve Stem Seal

Removal

Broken valve spring (6513) or damaged valve stem seals (6571) and retainers may be replaced without removing the cylinder head (6049), provided damage to valve or valve seat has not occurred.

  1. Remove valve cover (6582). Refer to Valve Cover and Gasket in the In-Vehicle Service portion of this section.

  1. Remove the applicable spark plug (12405) and bring the piston (6108) to the top of the bore to prevent accidental loss of the valve into the cylinder.

  1. Remove the valve rocker arm fulcrum bolts, rocker arm seats (6A528), rocker arms (6564) and push rods (6565) from the applicable cylinder.

  1. NOTE: Failure of the air pressure to hold the valve(s) in the closed position is an indication of valve seat damage and requires removal of the cylinder head.

    Install an air line with an adapter in the spark plug hole and apply air pressure to the cylinder.

  1. Install the fulcrum bolt and position a suitable valve spring compressor. Compress the valve spring and remove the valve spring retainer key (6518), sleeve, retainer or rotator and valve spring.

  1. Remove and discard the valve stem seal.

  1. If air pressure has forced the piston to the bottom of the cylinder, any removal of air pressure will allow the valve(s) 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 valve for binds.

  1. Inspect the valve stem for damage. Rotate the valve and check the valve stem tip for eccentric movement during rotation. Move the valve up and down through normal travel in the valve guide and check the stem for binds. If the valve has been damaged, it will be necessary to remove the cylinder head. Refer to Cylinder Head(s) in the In-Vehicle Service portion of this section.

Installation

  1. If the condition of the valve proved satisfactory, lubricate the valve stem with Motorcraft XO-10W30-QSP or -DSP engine oil or equivalent meeting Ford specification ESE-M2C153-E. Hold the valve in the closed position and apply air pressure within the cylinder.

  1. Install a new valve stem seal on the valve guide. Valve stem seals must be bottomed on guide. Place the valve spring in position over the valve and install the valve spring retainer and sleeve. Compress the valve spring and install the valve spring retainer keys. Remove the compressor tool and fulcrum bolt.

  1. Lubricate the push rod ends with Multi-Purpose Grease D0AZ-19584-AA or equivalent meeting Ford specifications ESB-M1C93-B and ESR-M1C159-A and install the push rod. Apply Multi-Purpose Grease D0AZ-19584-AA or equivalent meeting Ford specifications ESB-M1C93-B and ESR-M1C159-A to the tip of the valve stem.

  1. Apply Multi-Purpose Grease D0AZ-19584-AA or equivalent meeting Ford specifications ESB-M1C93-B and ESR-M1C159-A to the rocker arms and rocker arm seats. Install the rocker arms, rocker arm seats and fulcrum bolts. Tighten to 24-34 Nm (18-25 lb-ft).

  1. Turn off the air and remove the air line and adapter. Install the spark plug and connect the spark plug wire.

  1. Clean and install the valve cover. Refer to Valve Cover and Gasket in the In-Vehicle Service portion of this section.