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On Wed, 2003-04-16 at 21:03, Aaron Clow wrote: > Less than two weeks into my latest aircooled VW > ownership I've done at least one really stupid thing > -- didn't check for gasoline before trying to get the > car started. OK, now that I've admitted that, tonight > I finally got around to doing a compression test on > the engine. Just over 120psi on all cylinders except > for #3, which was (gulp) 40-50psi. I double checked > each one, and the readings were all correct. Is there > a chance (hopefully) I'm doing something stupid again > and this might be caused by something other than > something that's going to mean an overhaul? The two > things I didn't do was put a little oil in the > cylinder (my oil "syringe" was stuck and couldn't free > it) and I haven't yet checked the valves. Could either > of these issues cause such a drop in pressure? I'm > going to do both of these tomorrow night... If the > figure doesn't change, I really shouldn't drive the > car at all like this, right? > Check the valve adjustment. I may be a tight valve. Or, if this engine has been sitting for a long time, it could be a chunk of carbon under the valve. If you find a tight valve, check it frequently after getting the car running. If it tightens again, expect to do a valve job and replace the exhaust valve guides. And never reuse exhaust valves during a valve job. -- Russ Wolfe '66 FB MT '71 FB AT '65 Bug (not running) russw@classicvw.org http://www.classicvw.org ------------------------------------------------------------------- List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org