Contents: Removal ↳ Installation ↳
Worn valve stem seals are the cause of high engine oil consumption. The stem seals can be replaced without removing the cylinder head, but this requires an adapter and compressed air. If all of this is missing, the cylinder head must be removed.
Removal
Apply the handbrake and shift the gearbox into neutral.
Remove the spark plug caps and unscrew the spark plugs.
Engine ONS: remove the pressure lever, see p. 22.
DOHC engine: remove camshafts and plate tappets, see p. 16.
V6-OHV Engine: Remove Rocker Arm Shafts, see p. 19.
Screw the HAZET 3428 adapter with the attached compressed air hose into the threaded hole for the spark plug of the corresponding cylinder.
If there is no adapter, it can be made from an old spark plug. To do this, remove the ground electrode "1". Use a screwdriver to destroy the ceramic insulator "2", then, swinging the central electrode "3" in different directions, break it off and pull it out. Knock out the remainder of the central electrode together with the fiberglass "4" and the connecting electrode "5" with a suitable punch (approximately 3 mm in diameter). In this case, clamp the spark plug in a vice or insert it into a corresponding socket head.
Caution: To avoid damaging the threads in the cylinder head, the spark plug threads must not be damaged.
Screw the prepared spark plug into the appropriate cylinder and connect it to the compressed air hose.
Continuously pump compressed air into the cylinder at a pressure of at least 6 bar.
Engine OHC: Using the FORD 21-005B tool, press down on the valve spring plate and remove the crackers from the valve groove.
4-cylinder DOHC engine
According to the drawing, make a retaining plate from a 6 mm thick steel sheet.
Make your own retaining plate "C" and, as shown in the figure, screw it with a nut on the stud for fastening the camshaft bearing cover. Attach the special tool FORD 212-024 "A" and 21-024-04 "B". Use it to compress the valve spring and remove the crackers from the valve stem.
V6 OHV engine: Compress the valve springs using the FORD special tool 21-056 and remove the crackers from the valve stem.
Caution: When pressing the spring plate to remove the crackers, do not damage the valve stem. If the stem is damaged, the valve must be replaced, as a damaged stem wears out quickly.
Release the valve springs, remove the upper and lower spring plates and valve springs.
Remove the valve stem seal. At a service station, removal is performed using a standard tool, such as the GV 2124, HAZET 791-5 or the HAZET 791-2 impact puller. Old valve stem seals are usually very tightly seated. Therefore, if possible, an impact puller should be used to remove them.
Caution: Remove the valve stem seals carefully to avoid damaging their seats
Installation
To avoid damaging the valve stem seals, cover the groove for the crackers in the valve stem with adhesive film.
Place the new lubricated valve stem seal onto the valve guide by hand.
Using a hammer and a special FORD tool, seat the valve stem seal. If the special tool is not available, you can use a suitable tube without sharp edges, which has the same diameter as the valve stem seals. Special FORD tool - for the ONS 21-007 engine; for DOHC and V6 engines: 21-130A
Remove the adhesive film.
Insert the lower and upper spring plates together with the springs and compress the springs.
Insert the crackers and release the springs.
Replace the remaining oil seals in a similar manner.
V6 OHV Engine: Install Rocker Arm Shafts, see p. 19.
4-cylinder DOHC engine: install camshafts and tappets, see p. 16.
Engine ONS: install push levers, see p. 22.
Install the cylinder head cover, see p. 16.