worn valve guides

[Alan Cottrill]

I have what I'd consider a noisey top end.

I don't have a good frame of refrence as mine is the only 911 motor I'v ever heard.

I've adjusted the valves 3 times now. The last time, tripple checking my settings by going through the firing order 3 extra times. If anything the valves are a little tight.

I've posted about this before. valve guide wear was mentioned as a likely source of the noise.

if the guides were worn enough to be noisey, would I notice a lot of oil burning?

the reason I ask is because I was ready to pull the motor and do the top end when I realized it wasn't really burning any oil.

will adjusting the valves too tight cause a loud top end?

I followed the procedure in 101 projects to the letter. the only thing i question is my idea of snug. It takes some effort for me to remove the feeler and the feeler is slightly deformed by the tightening of the screw..

I've listened to the noise with an automotive Stethoscope

the noise is louder on some valves than others

the noise is louder at the valve covers over the rockers than on the heads, or manifolds.

the noise cannot be heard on the cylinders.

just a side note, the bottom end is supprisingly quiet.

I'm not trying to be cheap. I'd just like to drive the car for the summer if i can. I know if I tear it down now it won't go back together unitl the fall, thats just how things work out for me. (too many irons in the fire) I guess I'm just being selfish, it's just so much fun to drive.

any advise would be greatly appreciated.

[jcbear]

Big AL -

I don't have a good frame of refrence as mine is the only 911 motor I'v ever heard.

Mapquest indicates that it's about 144 miles from Yakima to Seattle, (about 2-3 hour drive), - if there aren't any/few Porsches in Yakima why not plan a motoring day and go see John Walker in Seattle?

[snowman]

Why are you using a feeler guage for the valves? A dial indicator guage is much easier and more accurate.

This probably dosen't have much to do with the noise as a couple of thou either way probably will not make a differen't sound. You should hear something, as these are solid lifters, they are not noiseless lifters. A very faint clicking is normal, a loud clicking is not. If you have heard a bad hydrolic lifter it makes a noise too loud for a properly adjusted mechanical lifter. But a properly adjusted mechanical lifter is louder than a good hydrolic one. Same sound but much much fainter. a gentle clicking.

[Alan Cottrill]

I have a trip to seattle planned for the end of the month. I'm definately going to stop in to see John.

[Doug Zielke]

Lifters?
What are you talking about here? Chevrolets?

[snowman]

No Fords

[Wayne 962]

Originally posted by snowman
Why are you using a feeler guage for the valves? A dial indicator guage is much easier and more accurate.

Hmm, I think that he would be following the *factory* procedure there.

Regardless, the 911 engine is naturally noisy. When I first heard my 914-6 engine start up many years ago, I could have sworn something was wrong with it. Listen to a few other cars, and compare - that is really the only way...

-Wayne

[snowman]

Originally posted by Doug Zielke
Lifters?
What are you talking about here? Chevrolets?

Its imaterial. Sloppy terminology by me but same meaning, so what.