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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / May 2006R/R valve seal questions. 93 Saturn
When I put air pressure into the cyl. I hear air leaking somewhere into the intake manifold. I've pulled both exh. and intake cams, so I know the valves are all closed. I can't detect their air coming through any of the seals... is that normal??? I am putting about 80psi in there, the piston moved down and turned the camshaft a bit, so there isn't a lot of air leaking, I'm just worried that when I pull the spring, the little bit of air leaking through might allow the valve to fall in... I'm changing the seals because the car is burning oil BIG TIME. I don't get air bleeding through to the other cylinders, I've put air into each cyl and they all have the same apparent leaking through to the intake, but cyl 1 has a little more leaking than the others. Man I sure hope I am being clear here! The number 1 cyl spark plug looks oily, and the others look evenly black. the car runs fine. -supa You can pull the plug out and use something like venetian blind cord to stuff the cylinder, then roll the piston up to jam the cord against the valve. That will hold them in place. It is a good idea to tie a stick on one end of the cord so it all doesn't get inside. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590 (More Off Road album links at bottom of the view page) > When I put air pressure into the cyl. I hear air leaking somewhere into > the intake manifold. I've pulled both exh. and intake cams, so I know [quoted text clipped - 19 lines] > > -supa If your hearing air into the intake with the valves "closed" your better off pulling the heads and do a valve job. Sounds like at least one valve is sticking open, probably due to carbon build-up on the stem or seat. It also sounds like your rings are worn since you state it is burning a lot of oil. Valve stem seals usually don't burn a lot of oil unless they are really shot.  SignatureSteve W. > When I put air pressure into the cyl. I hear air leaking somewhere into > the intake manifold. I've pulled both exh. and intake cams, so I know [quoted text clipped - 19 lines] > > -supa > When I put air pressure into the cyl. I hear air leaking somewhere into > the intake manifold. I've pulled both exh. and intake cams, so I know [quoted text clipped - 19 lines] > > -supa Understood. Air leaking into intake means valves not seating correctly. Requires cylinder head removal to repair. Could be carbon build up, worn valve guides, or worn valve seats. Burning oil big time will show up on the plugs. Valve stems leaking oil will have some noticeable symptoms. The ground electrodes on the spark plugs will accumulate ash deposits and there will usually be some blue smoke from the tail pipe when you first start the engine after it sits up overnight. Oil on the spark plug threads is from oil getting past the piston rings and migrating up the threads under pressure. That oil is kept cool enough by contact with the cylinders to keep it from burning off like oil that is atomized with the intake air when it leaks though the valve stems. If you make sure the cylinder you are changing the valve stem seal on is at exactly top dead center, the valves will stay closed under pressure and the piston will not push down. Even if the valve doesn't hold it can not fall all the way down because it will be stopped by the piston. You might be able to use a thin wire like a brazing rod or coat hanger through the spark plug hole to tell when the piston is all the way up. Be careful about stuffing string or rope in the cylinder through the spark plug hole. I've seen that go terribly wrong. SignatureKevin Mouton Automotive Technology Instructor "If women don't find you handsome, they should at least find you handy" Red Green Thanks so much Kevin!!! I recently replaced the four exhaust valves That post: http://groups.google.com/group/rec.autos.tech/browse_thread/thread/a224f1440c501 d9a/e0f185bbe7f11256?q=smoke+go+away&rnum=1#e0f185bbe7f11256 I didn't notice any marring or anything with those valves, so perhaps they are leaking a little but not too bad... I'll put the cyl at TDC, that sounds more foolproof than holding the valve in with air. Kevin, I would be happy to pay you for advice, I know this may sound corny, but I do a lot of work for people and sometimes I have questions that I would be willing to pay for the answer for... would you consider? thanks! Jesse > Thanks so much Kevin!!! I recently replaced the four exhaust valves > > That post: http://groups.google.com/group/rec.autos.tech/browse_thread/thread/a224f1440c501 d9a/e0f185bbe7f11256?q=smoke+go+away&rnum=1#e0f185bbe7f11256 > I didn't notice any marring or anything with those valves, so perhaps > they are leaking a little but not too bad... I'll put the cyl at TDC, [quoted text clipped - 8 lines] > > Jesse Nah, that would make it like work, and work is no fun. Just e-mail me if you need help. I will when I can. SignatureKevin Mouton Automotive Technology Instructor "If women don't find you handsome, they should at least find you handy" Red Green |
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