[NSRCA-discussion] Hatori Short Pipe O-Rings

[Derek Koopowitz]

Jim,

I spoke to Rich at length about this... he said to take the motor apart and
to clean the o-rings (make sure they are dry and not oiled when you put them
back) and also to replace the gaskets.  The simplest is to just replace all
o-rings and gaskets.

I've got the same problem on my one motor - the residue isn't black so I
know it isn't exhaust residue - it is clean fuel.  There is no leakage - all
bolts are tight and the header is tight as well.

Rich sent me replacement o-rings/gaskets and I intend to do that soon and
then run the motor to see if it still leaks.

-Derek

On Dec 11, 2007 10:49 AM, Woodward, Jim <jim.woodward at baesystems.com> wrote:

>   Hi Guys,
>
>
>
> What is the final verdict on these O-rings?  Will a warm run "melt" the
> O-ring?  Does the viton replacement fit tight enough over the header?
> Recently my plane is getting really messy, where as before there wasn't a
> drop of burnt fuel ahead of the exhaust stinger.  I replaced the o-ring but
> still had the mess.  I pull the motor last night and checked out everything
> and the motor looks great, bolts were tight, with no indication of any
> leakage from the motor or header to motor/flange attachment.
>
>
>
> I am using the Nishioka spring clamp mount.  All things considered and
> experienced, I think I prefer the stock Hatori mount that comes with the
> pipe.  The Nishioka seems to allow for more fore and aft pipe slippage
> during running due to the thin vertical white plastic supports (checked
> while running the plane upside down to try and determine spray pattern and
> such -  in which I didn't find one, which leads me to believe that it starts
> to happen maybe later in the flight or heat cycle, versus the small amount
> of running I did as a cursory check.
>
>
>
> Thanks,
>
> Jim
>
>
>
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