Diesel-resistant gasket sealant

[Tom Dacon]

What's your favorite diesel-resistant gasket sealant? This is for the
nitrile gasket on a clean-out port on the top of a small diesel fuel tank. I
wouldn't mind something that worked well for pipe threads, too.

Thanks,
Tom Dacon

[RichH]

Most common replacement for nitrile/BUNA/Neoprene is EPDM or
EthylenePropyleneDiamineMonomer .... if you cant find EPDM then plain
EthylenePropylene (EPR) will do.

[Bruce In Bangkok]

For threaded fittings get the LokTite catalog as they have just about
every sealant that you will ever want :-)

Cheers,

Bruce
(bruceinbangkokatgmaildotcom)

[Jenny]

"Bruce In Bangkok" <decypher...@sig.line> wrote in message
news:q14hc5lgjq6nn6in2...@4ax.com...

> For threaded fittings get the LokTite catalog as they have just about
> every sealant that you will ever want :-)

MOST threaded fittings don't use a gasket, so your answer is a non-sequitor.

>
> Cheers,

Drunk again?

[mmc]

"Jenny" <Je...@sox.not> wrote in message news:haa52h$qh1$1...@aioe.org...

That you Wilburrrr?

[Jenny]

"mmc" <eod...@yahoo.com> wrote in message
news:4ac8ea67$0$5657$9a6e...@unlimited.newshosting.com...

no

[mmc]

"Jenny" <Je...@sox.not> wrote in message news:haaptn$j2l$1...@aioe.org...

Capt Kneel?

[Jenny]

"mmc" <eod...@yahoo.com> wrote in message

news:4ac8f700$0$5643$9a6e...@unlimited.newshosting.com...

no

[Bruce In Bangkok]

Possible you need remedial reading lessons as the original poster
wrote ". I

>wouldn't mind something that worked well for pipe threads, too."

Cheers,

Bruce
(bruceinbangkokatgmaildotcom)

[matt_colie]

Tom,
Why do you think it needs a sealant in addition to the gasket.
If you are having a distinct problem with the assembly,
there may be some other issue here.
Matt

[RichH]

Most threaded connections is a fuel system shouldnt ever need gaskets,
sealants, etc. Compression fittings, double flared fittings, etc.
are *dry* metal to metal 'ring sealed', and the 'threads' on these are
ONLY to apply force to the rings seal (compression faces). So, if you
need to seal such fitting with goo/glop/dope, etc. then you have a BAD
fitting or a fitting that is worn-out .... and you should replace the
fitting in its entirety.

Compression fittings are designed for 'one time tighten only' and if
you need to open and reconnect you 'should' cut off the tubing area
that the 'compression ferrule' fits and put the compression ferrule
back onto 'uncompressed' (copper) tube; copper tube deforms under
these ferrules and you 'should' always cut off any part of the tube
that WAS previously compressed.

Double flared fittings can be opened/retightened, etc. many times;
and, should be the 'choice' for boat installations.

[Wayne.B]

On Mon, 5 Oct 2009 06:49:06 -0700 (PDT), RichH <rhm...@att.net>
wrote:

That's fine for gasoline engines but many large diesels and their
external filtration systems used ordinary pipe threads. Diesel
mechanics routinely use something like blue Permatex goop to seal the
pipe threads. Supposedly teflon tape is a big no-no with diesel.

[Tom Dacon]

"matt_colie" <ma...@charter.net> wrote in message
news:c5dym.57824$944....@newsfe09.iad...

Matt, I don't actually KNOW that it needs a sealant in addition to the
gasket. The clean-out port is on top of the tank, and the seal would be only
under stress when the boat is operating in a heavy seaway, where the area
might be subject to impact loading from the fuel sloshing in the tank. The
tank's 316L CRES of either 12 or 16 gauge, so flexing is a possibility in
heavy conditions. The dynamic loads are difficult to determine, and my only
other practical way to test it would be to fill the tank, close off all the
plumbing fittings, and invert it. Even then I'd be applying only a static
load.

So I'm thinking that if I could run a small bead of sealant around the
gasket it might help in maintaining a good seal in those circumstances.
Couldn't hurt, might help, and if it does it'll help keep the smell of
diesel out of the living spaces.

Tom

[Tom Dacon]

"Wayne.B" <waynebatr...@hotmail.com> wrote in message
news:id4kc5t3ug5o0hjta...@4ax.com...

Right - standard pipe threads, and this is the off-engine plumbing - fuel
transfer between tanks, etc.

Previously, I was using a teflon-based paste of some sort, but my supply is
long gone and I no longer remember what it was called or where I got it.
Hence my request for suggestions.

Tom

[Vic Smith]

On Mon, 5 Oct 2009 08:51:28 -0700, "Tom Dacon"
<TomN...@REALLYdacons.com> wrote:

>
>So I'm thinking that if I could run a small bead of sealant around the
>gasket it might help in maintaining a good seal in those circumstances.
>Couldn't hurt, might help, and if it does it'll help keep the smell of
>diesel out of the living spaces.
>

I look at Permatex first for this kind of thing.
This is probably what you're after.
http://www.permatex.com/documents/tds/Automotive/85249.pdf

--Vic

[Wayne.B]

On Mon, 5 Oct 2009 08:54:08 -0700, "Tom Dacon"
<TomN...@REALLYdacons.com> wrote:

>Previously, I was using a teflon-based paste of some sort, but my supply is
>long gone and I no longer remember what it was called or where I got it.
>Hence my request for suggestions.

Check with NAPA auto parts. Tell them it is for pipe threads with a
diesel fuel system.

[Steve Lusardi]

Tom,
Loktite pipe sealer is Teflon based and I use it extensively for NPT joints in Diesel fuel systems. It is expensive though.
Steve

"Tom Dacon" <TomN...@REALLYdacons.com> wrote in message news:had4m2$67q$1...@news.eternal-september.org...

[Tom Dacon]

"Vic Smith" <thismaila...@comcast.net> wrote in message
news:ai6kc5tn08vm20vb3...@4ax.com...

Whoo - that looks pretty good.

Thanks,
Tom

[Tom Dacon]

"Steve Lusardi" <steve...@lusardi.de> wrote in message
news:had5s8$sh3$02$1...@news.t-online.com...

> Tom,
> Loktite pipe sealer is Teflon based and I use it extensively for NPT
> joints in Diesel fuel systems. It is expensive though.
> Steve
>

Thanks, Steve - I'll see what my local NAPA can do for me.

Tom

[matt_colie]

Tom,

The problem is that if you put a pipe thread dressing on the gasket,
those things are all some manner of lubricant and may invite the gasket
to slide in the joint.

If you sue any type of dressing that is has adhesive properties (most
all that are not lubricants do), it may make future use of the access
port difficult at best. It may cause the gasket to be destroyed during
a future service.

Without seeing the situation, I'm afraid I can't be much more help than
that.

Matt

[Tom Dacon]

Thanks to everyone for their comments. You've given me plenty to work with.

Tom Dacon

"Tom Dacon" <Tom-N...@NOSPAM-dacons.com> wrote in message
news:-eqdndDjjZmEd1rX...@posted.isomediainc...

[IanM]

Teflon tape is a No-No because if it gets in the injection pump you have
killed the engine. Good reason to ban its general use in the workshop
if your staff aren't the brightest, but as long as you don't use it down
stream of the final filter and are intelligent about not over applying
it, or using it on inappropriate joint types so you aren't getting
chunks breaking loose and blocking lines, no problem. I usually reach
for the Gastite and the yellow reel Teflon Gas tape.

The OP might be well served with a *very thin* smear of Hermitite Red on
his inspection port gasket. Put a fuel sender in with that on its
neoprene gasket 3 years ago with bolts into tapped holes from the
inside with fibre washers under the heads, and washers and nylocs on
the resulting studs. Absolutely no weepage to date

--
Ian Malcolm. London, ENGLAND. (NEWSGROUP REPLY PREFERRED)
ianm[at]the[dash]malcolms[dot]freeserve[dot]co[dot]uk
[at]=@, [dash]=- & [dot]=. *Warning* HTML & >32K emails --> NUL: