REFLECTOR: Franklin seal leak

Tue Apr 19 15:27:42 CDT 2005

John:

I did remove the seal to look at it and found that the sealant used was
dried up.  I cleaned the seal and casing surface.  Then I gooped up
(it's a standard industry technical term) the outer surface of the seal,
plopped it back in, and smeared the outside of the seal in an attempt to
make sure there was unbroken sealant all the way around.  I also
fabricated a gasket from gasket material I bought at Tractor Supply
which closes off the same gap.  It has no effect on the seal between the
inner surface of the seal and the crankshaft.  I can't remember what the
sealant was but I'll check in a few hours when I'm at the hangar and get
back to you.  In any case, it was a common automotive form-a-gasket type
sealant.  It wasn't cement, though.

Mike

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of John Dibble
Sent: Tuesday, April 19, 2005 11:27 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Franklin seal leak

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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> > > >
> > > >
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> *******************************************
> Mike Deeter
> N2011 Test Pilot
> iguanamagic at yahoo.com
> http://iguanamagic.siegesmund.org
> *******************************************
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