Hi Josh,
Good point made regarding tapered thread sealing
qualities and the lube aids to obtaining a good mechanical seal.
I'm a little dismayed that you used Teflon tape
on the exhaust fittings. This is probably the
worst application for the product (second being
any system with a pump in it). It is best used in domestic water situations.
At about 660 degrees F Teflon tape decomposes and
emits a toxic fume. Fatal to birds in the home
when the frying pan gets too hot and probably not
good for humans in a small space either.
I whole heartedly support the use of high temp
anti-seize. It might stink a wee bit on the first
couple of runs but it probably won't harm you.
Cheers, Russ
Sweet 35 mk-1
At 04:08 AM 22/06/2015, you wrote:
Most if not all pipe dopes and Teflon tape
sealers are not really there to "seal" the
threads of a NPT fitting from leaking. They
are simply there to lubricate the threads so a
sufficiently tight connection can be made. The
lubricant may also help in disassembly. By
design the mechanical compression as a result of
the tapered threads is what is actually supposed
to prevents leaks. Yes, you can use all manner
of sealants which may "help" but a proper NPT connection shouldn't need it.Â
That being said, I used Teflon tape on my
exhaust (3GM35F). Just 2 wraps. I may have
difficulty getting the joint apart, who
knows. I also used a bench vice to provide enough counter-torque.
As a suggestion I would give high temp
anti-seaze a try. It is usually copper colored
and most auto parts stores should carry it. If
you've ever replaced an O2 sensor they include a small tube.
Josh Muckley
S/V Sea Hawk
1989 C&C 37+
Solomons, MD
On Jun 21, 2015 9:56 PM, "Sam Salter via
CnC-List" <<mailto:cnc-list@cnc-list.com>cnc-list@cnc-list.com> wrote:
2GM20F - Iâm about to replace the mixing elbow - got the part.
Thereâs a pipe joint between the mixing elbow
and the exhaust elbow that screws into both parts.
Do I screw this piece in dry or (more likely) use some sort of sealant?
If I need sealant - what do you guys suggest?
Iâve got a tube of high temp silicone left
over from installing my garage heater, is this stuff OK? If not - what???
sam :-)
C&C 26 Liquorice
Ghost Lake Alberta
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