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Valve Stem Oil Seal Replacement
By: stevo
(Published August 19, 2004)
Tools you will need:
* Ford fan clutch wrench set
* OTC 7928 tool for compressing valve spring
* Air-hold adapter tool with extention pipe to get it out of the recessed spark plug hole
* Magnet, small telescoping
* Air compressor-small one’s work ok
* Air hose
* ¼” drive ratchet
* 3/8” drive ratchet
* ½” drive ratchet
* Extensions (for all)
* 3/8” swivel
* 8MM socket
* 10MM socket
* 8MM wrench
* Needle nose pliers, 45-degree angle
* Screwdriver, small flat-blade
* Crescent wrench, medium size
* 3/8" drive Torque wrench, inch-pounds
* 3-Plastic tubs, for cleaning and oiling (like you get margarine in)
* Brass brush, small
* Shop Vac
Gaskets and Seals you will need:
* Valve Cover gaskets and grommets
* Valve Stem Oil Seals, 16pcs if SOHC, 32 if DOHC
* Throttle Body gasket
Chemicals you will need
* ¼ cup of grease
* Permatex Ultra Black RTV
* Lacquer Thinner
* Carb Cleaner in a spray can
* Electrical contact cleaner in a spray can
* Dielectric grease for the spark plug wire set
Misc things you will need
* Shop rags
* old T-shirts
* 5W-30 or 5w-20 oil for lubing valve train
Chiltons manual is junk for this job. Buy a Haynes.
DISCONNECT THE BATTERY
Seeing how this is one of the reasons the valve stem oil seals failed, now is a good time to clean the EGR channels under the Throttle Body and check the function of the EGR itself.
1. Crescent wrench under the passenger side of the car to remove the EGR exhaust tube from the exhaust pipe.
2. 8MM wrench to remove the EGR vacuum regulator/DPFE sensor bracket and get it out of the way. There are a couple of electrical connectors you will have to disconnect too.
3. Two 10MM bolts to remove EGR valve (flying saucer). You can check it’s function by applying some vacuum to the small tube and quickly remove. If you hear a muted thump, you know the membrane is in good shape.
4. Using your 3/8” ratchet, extension and 10MM socket, remove the four bolts and take off the TB elbow. There’s the EGR channel with three (3) small cutouts. Use throttle body cleaner and blast away. You may have to use a razor to clean out the cutout areas.
5. Make sure there are no cracks in the EGR exhaust tube. If there are, replace the tube.
6. Make sure there isn’t any moisture in the DPFE sensor. Mine was full of moisture and even had some pink eraser-like junk up in there. Shake it out.
Button it back up
Now, lets do the valve stem oil seal job!
1. Remove the fan clutch from the water pump pulley. AutoZone rents this tool, but you may want to buy this tool for your toolbox.
* Napa has one called a “Universal Pulley Holder/Fan Clutch Tool Kit”, Part # 3472. It worked great for me.
2. Remove the fan cowling. Two screws at each corner at the top. Lift up off tabs on the bottom and make sure you clear the lower radiator hose bracket.
3. Pull up and out together both the fan clutch and the fan cowling.
4. Remove the serpentine belt.
* This will require a ½” breaker bar or ratchet attached to the ½” square hole in the belt tensioner.
5. Remove the spark plug wire set from the spark plugs.
6. Remove the spark plug wire set cross-over channel.
7. Remove both coil packs and hang them down in front of the engine.
8. Disconnect all wiring harness wiring that will be in your way as you remove the valve covers.
* Some connectors will have to be disconnected to give you the added slack you’ll need to pull the valve covers up and out.
* If you remove the bracket for the DPFE / EGR vacuum pump at the back of the throttle body, it makes it easier to get more slack in the harness.
9. Remove the valve covers.
* Be careful not to nick or scar the bottom where the channel for the gasket is located.
10. Remove the old gasket from the valve cover channel.
* Using the needle nose pliers, punch all grommets out from the backside of the valve cover.
* Gentle rocking action while pushing with the nose closed works great.
* Clean the entire valve cover, removing any oily residue. CLEAN YOUR HANDS THOROUGHLY!
* Now install the new gaskets and grommets.
* Check to make sure the gasket is flat in the channel.
* Using clean paper towels, place the valve covers gasket-side down on your trunk lid until you re-install them.
11. Using your shop rags, plug the three oil drain holes in the head on each side.
* Also completely cover the cam chain area with shop rags or an old t-shirt. This will come in handy if you happen to lose a keeper or retainer.
12. Remove ONE cam cap cluster per the directions in the Haynes manual. DON’T REMOVE BOTH OF THEM as you will disturb the cam chain timing. With the cam cap cluster out of the way, this job becomes much easier.
13. Using your ½” ratchet and an 18MM socket, rotate the crankshaft nose clockwise until both cam lobes of the cylinder you are working are off the roller cam followers and at the lowest part of the cam lobe.
* Make sure your shop rags are not binding on anything.
14. Using your OTC 7928 valve spring compressor tool and 3/8” breaker bar, position the lower arm of this tool under the roller cam follower and slightly depress the retainer/spring to remove the cam roller follower from the top of the valve stem.
* NOTE: Make sure you have the tab on the lower arm of this tool to the outside of the retainer!
15. Clean the cam roller follower with a brass brush. Place into a clean oil bath (use margarine tub).
16. Clean the outside of the hydraulic lash adjuster with a brass brush. You can use Carb Cleaner with the small plastic tube and blast the heck out of the side hole to clean out the inside of this adjuster. Pump the piston up and down as you hold it sideways to help remove the debris. Place into a clean oil bath, upright, and pump the piston up and down to remove as much air as you can.
17. Using your air-hold adapter tool, insert into the spark plug hole for the cylinder you are working and bring the air up to around 60PSI. DO NOT OVER-TIGHTEN YOUR AIR-HOLD TOOL IN THE SPARK PLUG HOLE. A snug finger tight is all you need.
18. Using your OTC valve spring compressor tool again, push the retainer/spring down far enough so you can see the keepers in the valve stem grooves. Using the small telescoping magnet, remove the keepers. Now you can remove the retainer/spring. Clean both and set aside. Using needle nose pliers, firmly grip the middle of the oil seal and twist back and forth while you are pulling toward you. Remove the old oil seal and discard.
19. Bathe the new oil seal in fresh oil and position over the valve stem. Push down the new oil seal with your thumb to get the end of the new seal over the end of the valve stem. Gently rock the new oil seal as you slowly slide it over the stem grooves. After you get it past the grooves, firmly push it into place and bottom out the wide end of the new seal to the head.
20. Get the original retainer/spring for this valve and replace them over the valve stem. Use several practice strokes on the OTC tool to push the oil seal into place. There is a tab on the outer edge of the lower part of the OTC tool that, if not engaged properly, will cause you to launch the retainer/spring when new oil seal is installed. This is not good. If you do lose a retainer, be aware that the retainer that FORD now sells can only be used with a new, different spring as well.
21. Place the ¼ cup of grease close-by on a shop rag for easy access.
THIS IS WHERE IT CAN GET A LITTLE TRICKY.
22. Put a large dab of grease on the outside of one keeper, then stick your middle finger to that dab of grease while you hold the other side of the keeper with your thumb, pressing hard. Depress the retainer/spring until you can again see the grooves in the valve stem. As you get close to the valve stem, release your thumb and position the keeper into the valve stem groove with your middle finger. Repeat for the second keeper. Slowly release tension on the OTC tool and make sure that the keepers stay in the groove as the spring pulls the retainer up against them. Slightly depress the OTC tool again and check that the keepers are installed properly. Don’t worry about the grease—leave it on the valve stem and keepers.
23. Re-install your lash adjuster. Slightly depress the retainer/spring with your OTC tool and re-install your roller cam follower. After you have re-installed it, move it around with your fingers to check that is actually is located on top of the valve stem and in the groove of the roller cam follower. This is very important.
* NOTE: At cylinders #1 and #5 you will have to bring the roller cam follower in from the bottom side of the cam!
* Rotate the crank around slowly with your ½” drive and 18MM socket and check for binding.
24. Repeat for each cylinder. Replace each cam cap cluster as you move along using the pattern and torque specifications as called out in the Haynes manual.
25. Thoroughly clean entire gasket mating surface of heads with lacquer thinner. Do not leave any oily residue anywhere. Let lacquer thinner dry. Apply four dabs of Permatex Ultra Black RTV over old RTV (two each side) where the head and the cam chain cover come together.
* Give the entire valve train a good bath of oil before you button it up.
* Check gasket mating surface again for contamination. Clean again if in doubt!
26. Thoroughly clean your hands. The last thing you need to do is goober up your nice job.
27. Re-install the valve covers. Check (with your clean hands) and make sure that the back end of the valve cover gasket, the end closest to the firewall, is still in place. If not, push the gasket back into the channel. Check to make sure that the gasket is evenly distributed in the channel. Then torque per the Haynes manual. Actually this is going to be a guess unless you have a very deep 8MM socket for the bolts with the spark plug wire clip studs.
28. Reconnect your coil packs. Re-install your spark plugs. Reapply dielectric to your wire set at the spark plug ends and attach to spark plugs.
29. Re-install your fan clutch and fan shroud.
30. Spray electrical cleaner into each end of the connectors you removed earlier and reconnect them. (optionally, also use dielectric grease as well, to prevent moisture intrusion)
* Reconnect any vacuum lines.
31. Disconnect the crank position sensor. Small gray connector with two wires. It’s located under the AC compressor. You’ll see it underneath the car.
32. Re-connect the battery.
33. Crank the engine for approx. 20 seconds to pump the oil back into all the bearings and valve train area BEFORE you apply a load to the engine.
34. Re-connect the crank position sensor. Don’t forget to clean the connector ends with electrical contact cleaner!
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