The valve will try to push back into the cylinder, if you push down on
the spring to reinstall the valve keepers with a special valve
compressor for use when the head is still installed. Some folks use an
air compressor applying pressure thru a special air hose adapter through
the sparkplug hole for that cylinder while the piston is locked down at
TDC. In aviation mechanic school, another method they taught us was to
coil a very soft, thick rope into the sparkplug hole to prevent the
valve from going back into the cylinder while depressing the valve
spring. Just the right kind of rope would be needed to do this job.
Mike B.
On 3/28/2013 8:12 PM, Dave C. Bolen wrote:
Dean,
I am still a little confused...bear with me.
From your description it sounds like the valve must still be
"retained"...if it wasn't, the large round part that the retainers
hold down against the presure of the spring and the spring would be
laying on the bottom of the valve cover or pushing hard against the
rocker arm.
If you remove the rocker arm, does everthing on that valve fall off?
If so, then the retainers(or parts of it) have truely failed.
I suspect that what has happened is the valve was held in a partialy
down position for all of those years and a few gentle taps migh cause
the valve guide to "let go" of the valve and let the spring pop it
back to something close to "normal"....some liberal spraying of pb
blaster or so into where the valve stem and the valve guide are might
help.
Just my 2 cents worth...especially if the engine was running well to
start with.
Cheers, dave
On Thu, 28 Mar 2013, Dean Johnson wrote:
I've gone to the trouble of replacing my transaxel after having the
bug off the road for four years. I was commuting daily for about a
year before the
tranny failed. (70 mi round trip)
So imagine my surprise to discover when adjusting the valves that one
of my valve stems is below the valve spring retainer. Its suppose to
stick above
that so the rocker foot can push on it. This seems really bad.
Doesn't this mean my valve has been getting clobbered by the piston?
Doesn't this mean I
have to pull the head and have it rebuilt, if possible, or replaced.
Or is this the one time when something seems bad but really isn't?
I suppose I could take off the rocker arm to see if the valve stem is
ok, if the valve spring retainer keepers are anywhere to be seen. I
don't really
have much more money or time to throw at this.
Please send me a miracle.
Oh, Its a '71 Super Beetle with about 30,000 miles on an 1915 cc
engine rebuilt by Strictly Foreign (circa 2000). I was running it
with a single 34pict
jetted for the larger displacement.
Dean Johnson
Williamson, NY
p.s. to make sure my terminology makes sense,
valve stem: skinny end of valve sticking out towards the rocker
assembly.
valve spring retainer: disk shaped metal with hole in the center for
valve stem. sits on top (out board really) of the spring
valve spring retainer keeper: This I can't see but I assume there are
two of this buggers around the valve stem that sit in a circular
groove around the
end of the valve stem, they keep the valve stem from doing what mine
did, sneaking back towards the combustion chamber.
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