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MMD > Archives > August 1998 > 1998.08.18 > 20Prev  Next

Marvel Mystery Oil for Rebuilt Air Motor
By John A. Tuttle

Hi All,  It was nice to see Craig Brougher in print again.  His
comments about Marvel Mystery Oil reminded me of the tremendous
improvement in performance that I see and feel after I add a drop of
MMO to each of the new felt camshaft bearings on my rebuilt air motors.

Although I don't understand why MMO works as well as it does, unlike
Craig (he must see things on a molecular level), I have repeatedly been
surprised by the reduction is start-up torque required to get the motor

I use a simple, albeit unscientific, method to test the balance and the
minimum vacuum required to start the motor.  After insuring that all
the chambers are tight, I place a 1" vacuum hose with 40" of water
vacuum just close enough to the motor supply flange to make the motor
move.  Then I add a drop of MMO to each bearing and run the test again.
I always have to hold the hose farther away.

Next, I reduce the vacuum to 12" and 'burn the motor in' under load for
about an hour.  And although I can't see the long term effect on the
cam bearings, I can see the effect on the device that I use to load the
motor down.  It gets pretty warm.  But even after many hours of use,
there is no discoloration of the felt, no gummy buildup and (what
initially surprised me the most) the felt is still tightly glued to the
wood (I use hot hide glue).

Conversely, I have rebuilt numerous motors that were lubricated (and
severely contaminated) with oils and greases.  The bushings are always
black and sticky.

So my conclusion about MMO is ... it works!  Very Well Indeed!  (Craig,
thanks for prompting me to try it!  This may raise a few


John A. Tuttle (

Key Words in Subject:  Air, Marvel, Motor, Mystery, Oil, Rebuilt

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