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Date:         Mon, 15 Sep 2014 12:07:43 -0600
Reply-To:     Jon VonOhlsen <jondvo@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Jon VonOhlsen <jondvo@GMAIL.COM>
Subject:      Re: Quick throttle body re-bush
Comments: To: Alistair Bell <albell@shaw.ca>
In-Reply-To:  <4C2711D4-614E-4AD0-B87B-70020671A391@shaw.ca>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

I was expect the plastic seals to work fine for the life of the throttle shaft. As you point out, Alu & steel is not such a great mix either... Jon

On 9/14/2014 9:39 AM, Alistair Bell wrote: > I don't want to beat this to death but I understand now what you mean with the erosion of steel with plastic bearings. I can see how particles can become embedded in the plastic and wear the metal. But in this situation, throttle shaft, I doubt that is a big concern. > > The stock seals are nothing to write home about. Mine were dry and brittle. The throttle body material, some sort of aluminum alloy which does not turn a very nicely at all, probably rubbed the shaft worse than my plastic bearings will. I ink the shaft is hardened but to be honest I didn't take a file to it to test. > > Cheers > > Alistair > > > >> On Sep 13, 2014, at 8:58 PM, Jon VonOhlsen <jondvo@gmail.com> wrote: >> >> Generally plastic bearings do tend to wear the metal shafts more than expected. May be related to the plastic "holds" impurities which tend to provide a nice substrate for wearing the metal. This is a known phenomena in industrial/commercial apps, and I have seen this issue. Not sure about the throttle shaft/bearing as there is relatively low loading on the bearing. The factory seals are more compliant. >> Jon >> >> >>> On 9/13/2014 5:37 PM, Alistair Bell wrote: >>> Really? You think in this application the throttle shaft will be worn away? >>> >>> Geez, I better tell the guy who bought the 600 buck HDPE shaft bearing for me to install in his sailboat rudder :) >>> >>> Don't mean to sound snarky, it's just e first I have heard of such a thing in such an application. >>> >>> >>> Alistair >>> >>> >>> >>>> On Sep 13, 2014, at 1:31 PM, Jon VonOhlsen <jondvo@GMAIL.COM> wrote: >>>> >>>> One issue may be wear on the throttle shaft. HDPE, Delrin, and PFTE >>>> actually can wear the metal out. I have seen this in industrial plastic >>>> & metal applications. >>>> Jon >>>> >>>> >>>>> On 9/13/2014 1:54 PM, Neil N wrote: >>>>> very helpful Alistair. >>>>> >>>>> I still may buy the gowesty vacuum operated TB switch for my '88 but >>>>> knowing that HDPE likely works (untested?) is really helpful. >>>>> >>>>> Do you see HDPE wearing well over the long term? I'm sure I could >>>>> google up some info too. >>>>> >>>>> Thanks. >>>>> >>>>> Neil. >>>>> >>>>> On 9/13/14, Alistair Bell <albell@shaw.ca> wrote: >>>>> >>>>> >>>>>> http://shufti.wordpress.com/2014/09/13/vanagon-quick-throttle-body-re-bush/ >>>>> -- >>>>> Neil n >>>>> >>>>> Blog: tubaneil.blogspot.ca >>>>> >>>>> '88 Westy http://tinyurl.com/c8rlw6p >>>>> >>>>> '81 VanaJetta 2.0 "Jaco" http://tubaneil.googlepages.com/ >>>>> >>>>> Vanagon VAG *Gas* inline-VR Engine Swap Group: >>>>> >>>>> http://tinyurl.com/d7gd5ej


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