sticky valve or

Scott wrote:
Try the MARVEL!! We've been using it (dad & I) for 30 some years
mixed
in with the gas but I now think I will also use some in the oil).
The
first time I didn't use it (along with 100LL on a cross country trip)
I
stuck a valve with my A-65. Ran Marvel after the event, but was
unable
to unstick it. Decided to pull all cylinders and have the 100 Octane

valves installed. So Marvel at something like $10/gallon, or $2000
to
have the cylinders re-worked. I could buy lots of Marvel for
$2000...

Scott


Dick wrote:
Old WW2 mechanic says he hears a sticky valve on my C-85 when I
fire up for
first time in morning but can't describe the sound and says it
lasts only as
long as a finger snap.

Wants me to add Marvel Mystery oil. I use Aeroshell 100 (50 weight)
and
change it every 25 hours.

I can't detect any roughness upon initial start around 900-1000 rpm
in front
of my hanger nor during the taxi a couple of minutes to a runup
spot. On
throttling up to 1500 for the mag check, I notice a slight
hesitation around
11-1200 rpm that goes away quickly and thought was just from the
low speed
taxi.

Since I had to put a rental down about 7 years ago for a valve
problem (per
the FBO), there is a little "pucker" factor regarding this
conversation G.

Light Plane Maintenance book references "hand proping before first
start of
day to find 'flat' cylinder". Not sure I can identify a rapid
falloff in
turning resistance (books definition).

Concern doesn't seem to get to the point where the "cold cylinder"
test is
applicable as doesn't last long (his finger snap).

Am I chasing nothing or what is a valid approach?

Thanks, Dick



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I have used MMO in my vehicles and tractors and all other internal
combustion equipment for 50+ years and depend on it to help prolong the
life. Will in plane engines also.
Good luck.

Bob Olds RV-4
Charleston,Arkansas


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