REFLECTOR: Franklin seal leak

[mike deeter]

All:

I had significant leakage out of my crankshaft seal
and found that it was leaking out around the outside
of the seal, i.e., between the engine casing and the
outer surface of the seal, NOT between the shaft and
the inner surface of the seal.  I did two things: 
fabricated a gasket to cover the above-mentioned area,
and gooped it w/ sealant there as well.  That seemed
to fix the problem.

I actually think the gasket was overkill; in the
directions for changing the seal, I think (my failing
memory at play here) it says to apply some sealant
where I mentioned above.  Mine had evidence it came
that way but it was all dried up.  I changed the seal
but, frankly, it didn't look any the worse for wear
and I probably just needed to add the sealant.

Try the sealant first.  It's easy and you can try the
gasket if that doesn't work.

Mike


--- John Dibble <aminetech at bluefrog.com> wrote:

> Thanks Steve.  That's an interesting point about oil
> temp.  Mine normally run 92-98 C
> (198-208F).  When I replaced the seal there was a
> lot of dark brown deposit on the
> shaft and I wonder if this abraded the seal and made
> it start leaking.  I assume the
> deposit came from degradation of the oil, perhaps
> due to a high temp.  What are your
> oil temps (before and now)?
> When I bought my Velocity it had 205 hours and the
> seal was not leaking.  I flew it for
> about 100 hours before the seal began leaking.  I
> wonder if one's operating habits
> (MAP, rpm, and amount of leaning) have any impact.
> Do you balance the prop?
> 
> Steve wrote:
> 
> > My Franklin has only 65 hrs on it. I have already
> replaced the
> > crankshaft seal due to it leaking oil. It still
> leaked with a new seal.
> > I have also been working on getting my oil temp
> down  ... with some
> > success. Since the oil temps came down, the oil
> leaking from the
> > crankshaft seal stopped leaking., so maybe its a
> temperature related
> > thing ??
> >
> > Pure coincidence, I happened to check for any play
> in the crankshaft
> > last week and was surprised to find a little play
> up and down but none
> > from side to side. I am still pondering this when
> up pops your e-mail.
> > Sounds like you have some experience or knowledge
> of this.
> >
> > I would appreciate hearing what you know. Is this
> a known Franklin issue
> > ? How much of a concern (if any) does it represent
> ?
> >
> > Steve
> >
> > Robin Ream wrote:
> >
> > >Just out of curiosity, can you feel any up and
> down play in the output end
> > >of the crank shaft, and did you dynamically
> balance the prop?
> > >
> > >Robin
> > >==========================
> > >
> > >----- Original Message -----
> > >From: "John Dibble" <aminetech at bluefrog.com>
> > >To: "Velocity Aircraft Owners and Builders list"
> <reflector at tvbf.org>
> > >Sent: Sunday, April 17, 2005 6:21 PM
> > >Subject: REFLECTOR: Franklin seal leak
> > >
> > >
> > >
> > >
> > >>I have a 220 hp Franklin/IVO prop with 370
> hours.  Recently I replaced a
> > >>
> > >>
> > >leaking
> > >
> > >
> > >>crankshaft seal at the prop end.  After 28
> hours, the new seal has started
> > >>
> > >>
> > >leaking.
> > >
> > >
> > >>Any ideas what is causing this?  I cruise
> between 2400-2500 rpm.  What rpm
> > >>
> > >>
> > >do others
> > >
> > >
> > >>cruise at?  Thanks, John
> > >>
> > >>
> > >>
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*******************************************
Mike Deeter
N2011 Test Pilot
iguanamagic at yahoo.com
http://iguanamagic.siegesmund.org
*******************************************