Installing new valve stem seals
11-08-2007, 12:06 AM
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Installing new valve stem seals
I started installing new valve stem seals tonight and thought I would share a few pictures. Pic 1 is of the valve spring compressor installed. I pressurized the cylinder with about 110psi to keep the valve from falling down. I used an attachment from a compression tester. Its the green hose in the Pic. Pic 2 is of the valve spring (smaller one is inside the larger one in pic), valve spring retainer and the two keepers. Pic 3 is the old seal. Pic 4 is the new seal installed.
Once you compress the spring, use a magnetic pick up tool to remove the keepers. Then undo your spring compressors and remove the springs and retainer. Note that the larger spring has a tighter winding on one side and that side must face the cylinder when reinstalling. I used some narrow access valve stem seal removal pliers to get the old seal out. It was really in there tight and took some coaxing to get out. Drive the new seal on with a 13mm deep socket. You feel it "snap" into place when its all the way on. By far, the hardest part will be reinstalling the valve keepers. Just be patient. I put a little oil on the inside of the first one to help it stick in place while I installed the second one.
I hope I didn't leave anything out. Maybe someone else will find this useful if they decide to do theirs.
Scott
p.s. If you get this far, this is an excellent opportunity to see if your guides are bad. Simply grab the valve stem and try to move it. If it doesn't move at all, you should be good. I think Porsche says 1/64th of an inch of movement is too much. Basically, if you can feel any movement, your guide is shot.
Once you compress the spring, use a magnetic pick up tool to remove the keepers. Then undo your spring compressors and remove the springs and retainer. Note that the larger spring has a tighter winding on one side and that side must face the cylinder when reinstalling. I used some narrow access valve stem seal removal pliers to get the old seal out. It was really in there tight and took some coaxing to get out. Drive the new seal on with a 13mm deep socket. You feel it "snap" into place when its all the way on. By far, the hardest part will be reinstalling the valve keepers. Just be patient. I put a little oil on the inside of the first one to help it stick in place while I installed the second one.
I hope I didn't leave anything out. Maybe someone else will find this useful if they decide to do theirs.
Scott
p.s. If you get this far, this is an excellent opportunity to see if your guides are bad. Simply grab the valve stem and try to move it. If it doesn't move at all, you should be good. I think Porsche says 1/64th of an inch of movement is too much. Basically, if you can feel any movement, your guide is shot.
Well done Scott and thank you for the pics
11-08-2007, 10:37 PM
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I mistyped last night. There is a little wiggle room on the valve stem. Thats fine. You will know by comparison when you have too much wiggle. Make sure you decompress the cylinder, remove your old seal and push the valve in a little when you go to see how much play you have.
Scott
Scott
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11-09-2007, 11:18 PM
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