Honda Car Forum

On Sat, 15 Nov 2008 15:46:04 +0000, Tegger wrote:

> jim beam <spamvortex@bad.example.net> wrote in
> newsaadnXvYnvgpcIPUnZ2dnUVZ_uqdnZ2d@speakeasy.ne t:
>
>> On Sat, 15 Nov 2008 15:26:37 +0000, Tegger wrote:
>>
>>
>
>>> Toyota's OEM gasket for oil pan drain plugs is non-metallic. It's some
>>> sort of hard black fibrous material. Works quite well.
>>
>> it uses the fiber reinforcing to address tearing. and being polymeric,
>> it can't take the same thermal load - academic here though.
>>
>>
>
> What does thermal load matter? The gasket works just fine sealing
> against hot oil in spite of being non-metallic, which was my only point.
>
> A gasket for a fastener does not have to be metallic to be effective and
> allow specified torque.

to be utterly pedantic, a metal crush washer isn't going to soften or
creep at the temperatures a polymeric one will. and thus it will maintain
torque. academic? probably. relevant? probably not.

jim beam <spamvortex@bad.example.net> wrote in
news:cJ-dnbP7QaooYoPUnZ2dnUVZ_g6dnZ2d@speakeasy.net:

> On Sat, 15 Nov 2008 15:46:04 +0000, Tegger wrote:
>
>> jim beam <spamvortex@bad.example.net> wrote in
>> newsaadnXvYnvgpcIPUnZ2dnUVZ_uqdnZ2d@speakeasy.ne t:
>>
>>> On Sat, 15 Nov 2008 15:26:37 +0000, Tegger wrote:
>>>
>>>
>>
>>>> Toyota's OEM gasket for oil pan drain plugs is non-metallic. It's
>>>> some sort of hard black fibrous material. Works quite well.
>>>
>>> it uses the fiber reinforcing to address tearing. and being
>>> polymeric, it can't take the same thermal load - academic here
>>> though.
>>>
>>>
>>
>> What does thermal load matter? The gasket works just fine sealing
>> against hot oil in spite of being non-metallic, which was my only
>> point.
>>
>> A gasket for a fastener does not have to be metallic to be effective
>> and allow specified torque.
>
> to be utterly pedantic, a metal crush washer isn't going to soften or
> creep at the temperatures a polymeric one will. and thus it will
> maintain torque. academic? probably. relevant? probably not.
>
>



So then how is it that the Toyota fiber washer appears to maintain torque
sufficient to prevent leaks?

I have to give a fiber-gasketed bolt just as much of a tug to loosen it
that I must apply to a Honda metal-gasketed bolt, so clearly the fiber
gasket is not failing over time.

If you mean a fiber washer would not be able to withstand temperatures of,
say, 1000 degrees while a metal one will, that may well be true. Except
that oil never gets any hotter than about 220, so metal's advantage there
is moot.


--
Tegger

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/