uses for seal packing?

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Old 07 Oct 2008, 03:58 pm   #1 (permalink)
mrdarrett@gmail.com
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Default uses for seal packing?

I was reading up on how to replace a valve cover gasket, and noticed
the requirement for "seal packing" before installing a new valve cover
gasket.

Is seal packing required/recommended when installing a new
transmission pan gasket?

Where else should seal packing be used?

Thanks,

Michael
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Old 07 Oct 2008, 07:27 pm   #2 (permalink)
johngdole@hotmail.com
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Default Re: uses for seal packing?

The packing is to seal the seams at the semi-circular plug. The cutout
was made for machining the cam journals. If you don't use it then the
oil can leak past. The same logic for not scratching the sealing
surfaces. A little dab is all you need, don't over do it. You don't
want broken-off RTV beads in the cylinder head.

The reason you don't need RTV packing at the ATF pan is because the
cork-rubber gasket that seals well. Fram ATF kit works fine for
occasional work. No fiber gasket here if you have a choice like at a
tranny supply shop. For more frequent work a gasket there is like what
$3? A strainer $8? A master rebuild kit (steel and friction plates) ~
$200. Call your local http://www.transtarindustries.com/

The Permatex Ultra Grey is fine. Although I have used water pump RTV
and Ultra Copper, because I have some leftovers without having to open
up a new tube is all.

Make sure all sealing surfaces are clean and dry. I wipe them off with
alcohol. You also need to re-torque the tube nuts as the rubber
compresses and lose torque (this is another lousy sealing design,
Honda's done it better).

Ultra Grey (for high torque applications):
http://www.permatex.com/products/Aut...sket_Maker.htm



On Oct 7, 1:58*pm, mrdarr...@gmail.com wrote:
> I was reading up on how to replace a valve cover gasket, and noticed
> the requirement for "seal packing" before installing a new valve cover
> gasket.
>
> Is seal packing required/recommended when installing a new
> transmission pan gasket?
>
> Where else should seal packing be used?
>
> Thanks,
>
> Michael


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Old 07 Oct 2008, 07:53 pm   #3 (permalink)
johngdole@hotmail.com
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Default Re: uses for seal packing?

With the exception of paper gaskets, RTV and rubber gaskets usually do
not mix, except in little dabs for the circular plugs for example.

For additional information, visit the Permatex Video Center:

http://www.permatex.com/videos/video_gasketing_eng.html



On Oct 7, 1:58*pm, mrdarr...@gmail.com wrote:
> Where else should seal packing be used?
>
> Thanks,
>
> Michael


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Old 08 Oct 2008, 06:32 pm   #4 (permalink)
Daniel
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Default Re: uses for seal packing?

mrdarr...@gmail.com wrote:
> I was reading up on how to replace a valve cover gasket, and noticed
> the requirement for "seal packing" before installing a new valve cover
> gasket.
>
> Is seal packing required/recommended when installing a new
> transmission pan gasket?
>
> Where else should seal packing be used?
>
> Thanks,
>
> Michael

===================
Seal packing is not used for the transmission pan gasket.

It is used for the engine oil pan gasket, and is the only gasket
material specified, that is the form in place gasket material forms
the gasket without any other materials. I replaced mine approximately
60,000 miles ago and it is holding up real well.
If you use some other material, just make sure it is oxygen sensor
safe. The acetic acid released during cure with some RTV sealants is
harmful to the sensor.
The Toyota FIPG seems like a good sealant to me, even used it on the
plastic coolant overflow tank, and it adhered well.
Permatex does make a good product especially if you get the right
application, but for the few dollars involved, I like to use the
Toyota parts on the Toyota.
As JohnGd points out, the FIPG at the valve cover is only to seal the
spots where the curved sides at the camshafts meet the flat portions
of the gasket sealing surfaces.
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Old 08 Oct 2008, 06:40 pm   #5 (permalink)
mrdarrett@gmail.com
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Default Re: uses for seal packing?

On Oct 8, 4:32 pm, Daniel <nospampls2...@yahoo.com> wrote:
> mrdarr...@gmail.com wrote:
> > I was reading up on how to replace a valve cover gasket, and noticed
> > the requirement for "seal packing" before installing a new valve cover
> > gasket.

>
> > Is seal packing required/recommended when installing a new
> > transmission pan gasket?

>
> > Where else should seal packing be used?

>
> > Thanks,

>
> > Michael

>
> ===================
> Seal packing is not used for the transmission pan gasket.
>
> It is used for the engine oil pan gasket, and is the only gasket
> material specified, that is the form in place gasket material forms
> the gasket without any other materials. I replaced mine approximately
> 60,000 miles ago and it is holding up real well.
> If you use some other material, just make sure it is oxygen sensor
> safe. The acetic acid released during cure with some RTV sealants is
> harmful to the sensor.
> The Toyota FIPG seems like a good sealant to me, even used it on the
> plastic coolant overflow tank, and it adhered well.
> Permatex does make a good product especially if you get the right
> application, but for the few dollars involved, I like to use the
> Toyota parts on the Toyota.
> As JohnGd points out, the FIPG at the valve cover is only to seal the
> spots where the curved sides at the camshafts meet the flat portions
> of the gasket sealing surfaces.




Ok, thanks. I read somewhere that someone had used seal packing
around the screws holding the trans pan, and I thought, whoops, I
should have done that... never mind then.

I'm considering doing a valve cover gasket change (myself, for the
first time), and a good thing I read the directions closely from
camrystuff.com - seal packing is not optional, eh...

Thanks,

Michael
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Old 08 Oct 2008, 08:33 pm   #6 (permalink)
johngdole@hotmail.com
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Default Re: uses for seal packing?

I wouldn't use any RTV, sealant or even thread lockers on tranny pan
bolts. There are some head bolts going into the water jacket on some
engines, and those use teflon sealants.

The thing with RTV is that once you punched open the tube it gradually
dries out.

If you do the valve cover gasket, also change the PCV valve grommet
and valve if not done recently.



On Oct 8, 4:40*pm, mrdarr...@gmail.com wrote:
> Ok, thanks. *I read somewhere that someone had used seal packing
> around the screws holding the trans pan, and I thought, whoops, I
> should have done that... never mind then.
>
> I'm considering doing a valve cover gasket change (myself, for the
> first time), and a good thing I read the directions closely from
> camrystuff.com - seal packing is not optional, eh...
>
> Thanks,
>
> Michael


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Old 09 Oct 2008, 12:18 pm   #7 (permalink)
Daniel
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Default Re: uses for seal packing?

johngd...@hotmail.com wrote:
> The thing with RTV is that once you punched open the tube it gradually
> dries out.

====
When I close an opened RTV tube, I first squeeze out apx. 1/4" sealant
then push on the cap right through it and thread it back in place.
Sort of uses the sealing ability of the material to seal the cap, then
it peels away easily enough on the next use.
Not saying this is perfect, but it does seem to help quite a bit.
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Old 10 Oct 2008, 06:21 pm   #8 (permalink)
johngdole@hotmail.com
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Default Re: uses for seal packing?

Yes, done that. That's the standard "storage" method for all silicone
based sealers (RTV and caulking).

I'd say the general recommendation for important jobs (transmission
pan, oil pan, etc) is to use a new tube. But a little dab on the
cylinder head to seal the seams at the semi-circular plug, a "recently
opened" tube should work fine.


On Oct 9, 10:18*am, Daniel <nospampls2...@yahoo.com> wrote:
> When I close an opened RTV tube, I first squeeze out apx. 1/4" sealant
> then push on the cap right through it and thread it back in place.
> Sort of uses the sealing ability of the material to seal the cap, then
> it peels away easily enough on the next use.
> Not saying this is perfect, but it does seem to help quite a bit.


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Old 17 Oct 2008, 11:46 am   #9 (permalink)
mrdarrett@gmail.com
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Default Re: uses for seal packing?

On Oct 8, 6:33 pm, johngd...@hotmail.com wrote:
> I wouldn't use any RTV, sealant or even thread lockers on tranny pan
> bolts. There are some head bolts going into the water jacket on some
> engines, and those use teflon sealants.
>
> The thing with RTV is that once you punched open the tube it gradually
> dries out.
>
> If you do the valve cover gasket, also change the PCV valve grommet
> and valve if not done recently.
>
> On Oct 8, 4:40 pm, mrdarr...@gmail.com wrote:
>
> > Ok, thanks. I read somewhere that someone had used seal packing
> > around the screws holding the trans pan, and I thought, whoops, I
> > should have done that... never mind then.

>
> > I'm considering doing a valve cover gasket change (myself, for the
> > first time), and a good thing I read the directions closely from
> > camrystuff.com - seal packing is not optional, eh...

>
> > Thanks,

>
> > Michael



Update -- it looks like I might not need to replace my valve cover
gasket (not immediately, at least).

I got a 30mm socket from Lowe's ($8, not bad) and discovered the valve
cover nuts were quite loose. I tightened them. This should stop the
oil seep that I discovered (and that led me to believe the valve cover
gasket needed replacing).

I had the valve cover gasket replaced 2 years ago at Pep Boys.

Thanks,

Michael
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Old 18 Oct 2008, 12:51 am   #10 (permalink)
johngdole@hotmail.com
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Default Re: uses for seal packing?

That should hold it for a while. Most valve covers without stoppers
(or little standoffs) would benefit.

This design is not ideal. Because the large spark plug tube seals
compress easily and you lose clamping force. Most shops won't bother
waiting 30 min. and retorque. That's why I say, for example, the Honda
design is much better.



On Oct 17, 9:46*am, mrdarr...@gmail.com wrote:
> Update -- it looks like I might not need to replace my valve cover
> gasket (not immediately, at least).
>
> I got a 30mm socket from Lowe's ($8, not bad) and discovered the valve
> cover nuts were quite loose. *I tightened them. *This should stop the
> oil seep that I discovered (and that led me to believe the valve cover
> gasket needed replacing).
>
> I had the valve cover gasket replaced 2 years ago at Pep Boys.
>
> Thanks,
>
> Michael


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