Valve stem seals ? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 05-16-2001, 05:32 PM
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Valve stem seals ?

Hey guys, I've been reading these for a while and finally signed up. I bought an 83 CJ7 about a year ago and have been replacing things since. So far the books I bought have been great, but I ran out of ideas on this one. I am trying to change the valve stem seals on my 258. I compress the spring to remove the retainers but I cant get the spring to move down the valve stem so that I can get the retainers out. I tried several things to prop the valve up so I could tap down on the compressed spring. Is there a trick to this? I have done this on a few cars and it was easy. Thanks for any ideas - Ill try them all.

Finally got a CJ - IFS never again!
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post #2 of (permalink) Old 05-16-2001, 08:22 PM
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Re: Valve stem seals ?

Are you using the air hose attachment to hold up on the valve. If not you will have a hard time without it. It holds the valve up with compressed air. Before I take any pressure off the valve spring I take a large socket and hit it with a hammer right on top of the washer on top of the spring. Make sure the socket clears the valve stem though. You must have the air in the cylinder when you tap it. It will break the washer loose from the retainers then you can compress the spring and it will be loose on the valve

post #3 of (permalink) Old 05-16-2001, 09:08 PM
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Re: Valve stem seals ?

I am going to be giving it another shot tonight. How much air pressure did you use?

Finally got a CJ - IFS never again!
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post #4 of (permalink) Old 05-16-2001, 09:16 PM
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Re: Valve stem seals ?

Around 100psi. You are using the adapter that screws into the spark plug hole aren't you?

post #5 of (permalink) Old 05-16-2001, 10:22 PM
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Re: Valve stem seals ?

1. Go to the hardware store an buy yourself some good cotton rope that's smaller in diameter than the spark plug hole.
2. Pull all the plugs.
3. Find the compression stroke of the cylinder you want to work on... and back up the engine 1/4 rotation by hand using a ratchet and socket on the crankshaft.
4. Stuff that cotton rope into the spark plug hole till you can't stuff no more in.
5. Slowly advance the engine toward TDC of that cylinder.

The pistion will slowly compress the rope in the cylinder. Now you've got the valves held in place. You can now take off the springs, keepers and change the seal without the valve dropping into the cylinder.

When your done, back the piston off and pull out the rope and go on to the next cylinder and repeat the process.

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