John, Dow Corning 737 is 'non-corrosive'. I didn't know regular RTV could be corrosive, but Lycoming appears to think the difference is significant enough to call out. I would stick with 737, unless I thoroughly understood the chemistry and outgassing of a given substitute. Chris
Sent from my spiffy iPhone
Thanks, Chris! I grabbed Lycoming SI 1324 version A off the
Internet which recommended the Pliobond 20. Thanks for dragging me
into the 21st century! I'm now wondering if the red Silastic 736
wouldn't work better than the clear Silastic 737. The red RTV is
used to seal automobile water pump tubing, for example. Engineers!
Always trying to re-design stuff! LOL!
Rubber will last much longer if submerged in oil. The
failure may simply be due to nothing more than the years of
sitting idle.
In terms of the seal installation, I would recommend
using Dow Corning 737 (see SI 1324C, 2009), Pliobond is
offered up as an alternative if the 737 is not available.
After having recently changed a shaft seal, I highly
recommend sticking with the 737, in particular for the
do-it-yourselfer. It provides much more working time and is
easier to handle than contact adhesive. I can see many
A&Ps not wanting to use it because of the longer cure time
(24 hours).
Chris Zavatson
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