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#31
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Manual Transmission Fluid Change - Photos???
On Sat, 15 Nov 2008 15:46:04 +0000, Tegger wrote:
> jim beam > wrote in > news > >> 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. |
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#32
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Manual Transmission Fluid Change - Photos???
jim beam > wrote in
: > On Sat, 15 Nov 2008 15:46:04 +0000, Tegger wrote: > >> jim beam > wrote in >> news >> >>> 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/ |
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