Cylinder Head Removed
See Figures 1, 2, 3, 4, 5, 6 and 7
- Remove the cylinder head.
- Block the head on its side, or install a pair of head-holding brackets made especially for valve removal.
- Using a socket slightly larger than the valve stem and keepers, place the socket over the valve spring retainer and gently hit the socket with a plastic hammer to break loose any varnish buildup.
- Remove the valve keepers, retainer, (sleeve on 5.0L and 5.8L engine intake valve) and valve spring using a valve spring compressor (the locking C-clamp type is the easiest to use).
- Place the parts from each valve in a separate container, numbered and identified for the valve and cylinder.
- Remove and discard the valve stem oil seal.
- On the 5.0L and 5.8L engines, install new valve seals, using a 5 / 8 in. deep-well socket and a light mallet to seat the seal on the cylinder head and valve stem.
- Install any required shims, the valve spring and the retainer over the valve stem. Compress the spring with the valve spring compressor and install the keepers.
- After all the valves and springs have been assembled, take a mallet and lightly strike each valve stem tip squarely to seat the keepers.
- Disconnect the negative battery cable.
- Remove the rocker arm cover.
- Remove the spark plug from the cylinder where the seals are to be replaced.
- Rotate the crankshaft until the piston is at Top Dead Center (TDC) with both valves closed.
- Install a suitable adapter in the spark plug hole and connect an air supply line to the adapter. Turn on the air supply.
If the air pressure does not hold the valves closed during the following steps, there is probably valve and/or valve seat damage; remove the cylinder head.
- Remove the rocker arm fulcrum bolts, fulcrum, rocker arm, fulcrum guide and pushrod. Note their positions so they can be reinstalled in their original locations.
- Install the fulcrum bolt and position valve spring compressor tool T70P-6049-A or equivalent. Compress the valve spring and remove the keepers, sleeve (intake valve only), retainer and spring.
- Remove and discard the valve stem seal.
If air pressure has forced the piston to the bottom of the cylinder, any loss of air pressure will let the valve(s) fall into the cylinder. Wrap a rubber band, tape or string around the end of the valve stem to prevent this.
- Make sure the piston is at TDC. Remove the air pressure from the spark plug adapter and inspect the valve stem for damage. Rotate the valve and check the valve stem tip for eccentric movement. Move the valve up and down in the guide through its normal travel and check for binding. If the valve is damaged, the cylinder head must be removed.
- If the valve is okay, apply clean engine oil to the valve stem and hold the valve closed. Apply the air pressure to the cylinder.
- Install a new valve seal using a 5 / 8 in. deep-well socket and light hammer or mallet to seat the seal on the valve stem or use valve seal installer kit (guide mounted) T87L-6571-BH or equivalent.
- Position the spring and retainer (and sleeve, if equipped) over the valve stem and compress the valve spring. Install the keepers and release the compressor. Remove the compressor and fulcrum bolt.
- Turn off the air pressure and remove the air line and adaptor.
- Apply multi-purpose grease or equivalent lubricant to the pushrod ends and install the pushrods. Apply multi-purpose grease or equivalent lubricant to the valve stem tips.
- Apply multi-purpose grease or equivalent lubricant to the rocker arm pushrod socket, fulcrum seat and valve stem pad.
- Install the rocker arms, fulcrum seats and fulcrum bolts. Rotate the crankshaft until the lifter is on the base circle of the camshaft, then tighten the fulcrum bolt to 18-25 ft. lbs. (24-34 Nm).
- Install the spark plug and the rocker arm cover.
- Connect the negative battery cable, start the engine and check for leaks.