From: "Todd Bartrim" <flyrotary@lancaironline.net>
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Date: Thu, 19 Jan 2017 16:05:11 -0800
Message-ID: <CALYfWBtnHa1KbKicpHawNxdHF3uGXOoEmAZA6Rv0purU8ouRbg@mail.gmail.com>
Subject: What I wouldn't do again; Teflon encapsulated o-rings and leak stop
To: FlyRotary <flyrotary@lancaironline.net>
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   Long ago at an airport not so far away, on my last few flights I
suddenly began to see coolant pressure spikes when engine power was
increased. Pressure would fall off when power was decreased. There was a
small but measurable amount of coolant loss, but no external coolant leaks
and I couldn't detect the smell of coolant in the exhaust while idling. Of
course while under high power I was in the air and unable to sniff the
exhaust!
   So in a foolish moment I decided to put a small bottle of coolant
stop-leak into the coolant.
I flew a few more times then life got in the way, I brought the plane home
for the winter and completely forgot about the cooling issue. I had poured
some oil into the intake ports and rolled it over a few times in an attempt
to preserve the inside of the combustion chamber.
   10 years later and as I began to work on the plane again, I pulled the
plugs and found that one of the rotors had some awful looking plugs, so I
took the turbo off to look in the exhaust ports. I was shocked and
disappointed to see an awful corroded mess in one rotor while the other
looked good. So a tear down was the next obvious step.
Go to the google photos link below to see what I found.

https://goo.gl/photos/Dkpk1VqNxCd3zoBQ6

   So first thing was "what the **** is that blob" as I'd forgotten putting
the stop-leak into the system. So that's what that **** does to your
system! I won't use that again. After cleaning it off I could see the
source of the leak with the o-ring still in the groove. Apparently this is
not unheard of with these o-rings, so I replaced them with the stock
o-rings.
   The irons looked trashed at first, but a little work with a
scotch-bright pad and some WD-40 and they surprisingly looked not so bad,
but measuring the wear at the plug side it was right at the max allowable.
I inquired about getting them lapped at RX7 Specialties, which was very
reasonable, but I ended up just buying some that he already had done as the
price difference was about what it would have cost to ship mine to him. As
a bonus I got a newer center iron from a turbo engine which had a few
advantages for me as my original engine was not turbocharged.

Todd Bartrim

C-FSTB
RV9 13Bturbo

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<div dir=3D"ltr"><div>=C2=A0 =C2=A0Long ago at an airport not so far away, =
on my last few flights I suddenly began to see coolant pressure spikes when=
 engine power was increased. Pressure would fall off when power was decreas=
ed. There was a small but measurable amount of coolant loss, but no externa=
l coolant leaks and I couldn&#39;t detect the smell of coolant in the exhau=
st while idling. Of course while under high power I was in the air and unab=
le to sniff the exhaust!</div><div>=C2=A0 =C2=A0So in a foolish moment I de=
cided to put a small bottle of coolant stop-leak into the coolant.</div><di=
v>I flew a few more times then life got in the way, I brought the plane hom=
e for the winter and completely forgot about the cooling issue. I had poure=
d some oil into the intake ports and rolled it over a few times in an attem=
pt to preserve the inside of the combustion chamber.</div><div>=C2=A0 =C2=
=A010 years later and as I began to work on the plane again, I pulled the p=
lugs and found that one of the rotors had some awful looking plugs, so I to=
ok the turbo off to look in the exhaust ports. I was shocked and disappoint=
ed to see an awful corroded mess in one rotor while the other looked good. =
So a tear down was the next obvious step.</div><div>Go to the google photos=
 link below to see what I found.<br></div><div><br></div><div><a href=3D"ht=
tps://goo.gl/photos/Dkpk1VqNxCd3zoBQ6">https://goo.gl/photos/Dkpk1VqNxCd3zo=
BQ6</a><br></div><div><br></div><div>=C2=A0 =C2=A0So first thing was &quot;=
what the **** is that blob&quot; as I&#39;d forgotten putting the stop-leak=
 into the system. So that&#39;s what that **** does to your system! I won&#=
39;t use that again. After cleaning it off I could see the source of the le=
ak with the o-ring still in the groove. Apparently this is not unheard of w=
ith these o-rings, so I replaced them with the stock o-rings.</div><div>=C2=
=A0 =C2=A0The irons looked trashed at first, but a little work with a scotc=
h-bright pad and some WD-40 and they surprisingly looked not so bad, but me=
asuring the wear at the plug side it was right at the max allowable. I inqu=
ired about getting them lapped at RX7 Specialties, which was very reasonabl=
e, but I ended up just buying some that he already had done as the price di=
fference was about what it would have cost to ship mine to him. As a bonus =
I got a newer center iron from a turbo engine which had a few advantages fo=
r me as my original engine was not turbocharged.</div><br clear=3D"all"><di=
v><div class=3D"gmail_signature"><div dir=3D"ltr">Todd Bartrim</div><div di=
r=3D"ltr"><br></div><div>C-FSTB</div><div>RV9 13Bturbo</div></div></div>
</div>

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