REFLECTOR: Franklin seal leak

Tue Apr 19 11:26:36 CDT 2005

I wondered about that.  When I replaced the seal, the shop didn't have the special
cement that the instructions specified, so I used common automotive cement.  Since it
lasted 28 hours, I figured the cement wasn't an issue and I hadn't checked because I
have to remove the pickup for the Rose EI, but I guess I'll have to check.  What type
of cement did you use?  Do I understand correctly that you didn't remove the seal,
just put the cement on the back side?

John

mike deeter wrote:

> 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
> *******************************************
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