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My restored 1948 C85 Taylorcraft has a wing tank pet cock in the cockpit on=
the passgenr side under the panel. Recently, it started a very slow seep. =
An occasional drop but not quite a steady drip. The valve is a petcock that=
rotates 90 degree from full off to full on. It has a tapered bore and tape=
red stem. The fix was to remove and disasseble the valve, apply the finner =
grade of Clover Valve Grinding compound followed by Clover Lapping Compound=
. Prussian Blue was used to verify the two surfaces now perfectly matched. =
The vlave was reassembled and no longer leaks, even with 6 gallons of AV ga=
s above it.
Sincerey,
Randall Reihing
________________________________
From: Triumphs <triumphs-bounces@autox.team.net> on behalf of aribert neuma=
nn <aribertn@gmail.com>
Sent: Wednesday, September 16, 2020 9:59 PM
To: triumphs@autox.team.net <triumphs@autox.team.net>
Subject: [EXTERNAL] [TR] Small coolant leak - blueing the tapered surfaces
---------- Forwarded message ----------
com>>
>>
Bcc:
Date: Tue, 15 Sep 2020 21:46:56 +0000
Subject: Re: [TR] Small coolant leak
The drain =93valve=94 is actually a petcock. It doesn=92t have a gate and s=
eat, as such. The best fix is to relap the plug to the body, using valve g=
rinding compound.
Mike
There is a product called Prussian Blue. Here is a link to one mfg of it (=
not the only one) : https://www.permatex.com/products/specialized-mainten=
ance-repair/rebuilders-aids/permatex-prussian-blue/<https://urldefense.com/=
v3/__https://www.permatex.com/products/specialized-maintenance-repair/rebui=
lders-aids/permatex-prussian-blue/__;!!LoBwcKfm!1RXucXzoCkVKqGafAKDtvc3yQPg=
J__WX-6aY8mEpm7cUqWmH0XXmsiU-g0XKUZlgjepx5yw$> Should be available at any =
large industrial supply or machining supply type of store.
I bought a 1/2 or 1 oz tube about 25 yrs ago - still have 90% of it and use=
it maybe one or twice a year. This stuff is nasty, it is infinitely divis=
ible, it will get all over your hands and clothing if you are not careful. =
I store my small tube in a zip lock bag and frequently I'll only get a rub=
bing of blue off of the **outside** of the tube (previous sloppy handling, =
hence the zip lock bag). Put an extremely thin film (almost translucent) o=
n one of the two mating parts, asm and rotate a few times. The high spot(s=
) should transfer over to the mating part. Now you know how bad the mating=
parts are with respect to one another. Lap the parts as mentioned above. =
Redo the bluing to check the match. Once the entire surface around the wa=
ter port on the cone/socket is showing faint traces of blue, you are done l=
apping. You now have a new skill and someone in the future, at your estate=
sale, will have a royal mess on their hands when they open the tube to fin=
d out what it is.
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<body dir=3D"ltr">
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
My restored 1948 C85 Taylorcraft has a wing tank pet cock in the cockpit on=
the passgenr side under the panel. Recently, it started a very slow seep. =
An occasional drop but not quite a steady drip. The valve is a petcock that=
rotates 90 degree from full off
to full on. It has a tapered bore and tapered stem. The fix was to remove =
and disasseble the valve, apply the finner grade of Clover Valve Grinding c=
ompound followed by Clover Lapping Compound. Prussian Blue was used to veri=
fy the two surfaces now perfectly
matched. The vlave was reassembled and no longer leaks, even with 6 gallon=
s of AV gas above it. </div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
Sincerey,</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
Randall Reihing</div>
<div id=3D"appendonsend"></div>
<hr style=3D"display:inline-block;width:98%" tabindex=3D"-1">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" st=
yle=3D"font-size:11pt" color=3D"#000000"><b>From:</b> Triumphs <triumphs=
-bounces@autox.team.net> on behalf of aribert neumann <aribertn@gmail=
.com><br>
<b>Sent:</b> Wednesday, September 16, 2020 9:59 PM<br>
<b>To:</b> triumphs@autox.team.net <triumphs@autox.team.net><br>
<b>Subject:</b> [EXTERNAL] [TR] Small coolant leak - blueing the tapered su=
rfaces</font>
<div> </div>
</div>
<div>
<div dir=3D"ltr">---------- Forwarded message ----------<br>
From: Michael Marr <<a href=3D"mailto:mmarr@albiontechnical.com"; ta=
rget=3D"_blank">mmarr@albiontechnical.com</a>><br>
To: Jeff Scarbrough <<a href=3D"mailto:fishplate@gmail.com"; target=
=3D"_blank">fishplate@gmail.com</a>><br>
Cc: David Friedlander <<a href=3D"mailto:forzion7@gmail.com"; target=
=3D"_blank">forzion7@gmail.com</a>>, TR3 Triumphs <<a href=3D"mailto:=
triumphs@autox.team.net" target=3D"_blank">triumphs@autox.team.net</a>>,=
New England Triumphs <<a href=3D"mailto:net@newenglandtriumphs.org"; tar=
get=3D"_blank">net@newenglandtriumphs.org</a>><br>
Bcc: <br>
Date: Tue, 15 Sep 2020 21:46:56 +0000<br>
Subject: Re: [TR] Small coolant leak<br>
The drain =93valve=94 is actually a petcock. It doesn=92t have a gate and s=
eat, as such. The best fix is to relap the plug to the body, using va=
lve grinding compound.
<br>
Mike <br>
<div><br>
</div>
<div><br>
</div>
<div>There is a product called Prussian Blue. Here is a link to one m=
fg of it (not the only one) :
<a href=3D"https://urldefense.com/v3/__https://www.permatex.com/products/sp=
ecialized-maintenance-repair/rebuilders-aids/permatex-prussian-blue/__;!!Lo=
BwcKfm!1RXucXzoCkVKqGafAKDtvc3yQPgJ__WX-6aY8mEpm7cUqWmH0XXmsiU-g0XKUZlgjepx=
5yw$">
https://www.permatex.com/products/specialized-maintenance-repair/rebuilders=
-aids/permatex-prussian-blue/</a> Should be available at any large in=
dustrial supply or machining supply type of store.</div>
<div><br>
</div>
<div>I bought a 1/2 or 1 oz tube about 25 yrs ago - still have 90% of it an=
d use it maybe one or twice a year. This stuff is nasty, it is infini=
tely divisible, it will get all over your hands and clothing if you are not=
careful. I store my small tube in a
zip lock bag and frequently I'll only get a rubbing of blue off of the **o=
utside** of the tube (previous sloppy handling, hence the zip lock bag).&nb=
sp; Put an extremely thin film (almost translucent) on one of the two matin=
g parts, asm and rotate a few times.
The high spot(s) should transfer over to the mating part. Now you kn=
ow how bad the mating parts are with respect to one another. Lap the =
parts as mentioned above. Redo the bluing to check the match. O=
nce the entire surface around the water port on the
cone/socket is showing faint traces of blue, you are done lapping. Y=
ou now have a new skill and someone in the future, at your estate sale, wil=
l have a royal mess on their hands when they open the tube to find out what=
it is.<br>
</div>
</div>
</div>
</body>
</html>
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