|Silca floor pump problems||Aztecs|
Jan 22, 2002 6:53 AM
|I have a Silca floor pump with a Silca Presta/Schrader Chuck. My friend has a bike with tires with Schrader valves. No problem. Screw it on the valve, pump it up, unscrew, done. No air leaks out while pumping up the tire. When pumping up my tires w/Presta valves I run into a problem. Am I doing something wrong? Here are my steps:
1. unscrew presta valve
2. place presta chuck on valve
Air just leaks out of chuck while inflating. Since there is no step where you screw the chuck onto the valve it is not sealed. I can get it to inflate but I have to hold the chuck in place with one hand while I pump with my other hand. A pain in the a$$. This is a new pump so I doubt that is the problem. Also, just to make sure I bought a new P/S chuck. Same problem.
Any help would be appreciated
|re: Silca floor pump problems||Lone Gunman|
Jan 22, 2002 7:09 AM
|Just a thought. You need to "break the seal" of your presta valve. Touch down on the valve a few short blasts of release air, put the chuck on the valve and pump away.|
|re: Silca floor pump problems||pa rider|
Jan 22, 2002 10:01 AM
|I had this problem on my old Silca floor pump too. The rubber gasket got old (part that goes over presta stem), so my LBS said to replace it with a new one. Then a year later it started leaking again.
I just bought a new pump because I got tired of trying to find a LBS who would get me the gasket. It didn't cost much, but I got a new floor pump for under $30 that has both presta and schrader that lasted longer than my old Silca.
I guess you can say that the rubber hole just gets bigger over time.
|re: Silca floor pump problems||gtx|
Jan 22, 2002 10:19 AM
|get a new rubber gasket for the presta pump head and switch to Michelin tubes--the valve stems aren't threaded and won't wear out the gasket.|
|FYI -Torellis are unthreaded as well. (nm)||Sintesi at home|
Jan 22, 2002 5:17 PM
|re: Silca floor pump problems||Broom-Wagon|
Jan 22, 2002 12:34 PM
|I've had the same problem with my Silca pump, except that I have the Presta head and not the combo Schrader/Presta version. I've replaced the rubber gasket which helps. But over time, the problem will re-occur. What I've found that helps is to lubricate the gasket with a little grease. That seems to soften it slightly which may make for a tighter seal. Who knows, it seems to work.
|Silca's last forever!||guido|
Jan 22, 2002 1:10 PM
|Are you sure you've got the presta chuck engaged and not the shraeder? Threadless valve stems sometimes don't seal very well on the pump gasket, and air gets lost. When you get the new rubber washer from LBS, ask for two or three. I go through about one a year. Just greased the shaft of my Silca floor pump, and it works like a champ again. It's 19 years old.|
|yeah, had mine since 1984||gtx|
Jan 22, 2002 1:43 PM
|and haven't had to replace a gasket since I switched to Michelin tubes.|
Jan 22, 2002 1:42 PM
|If I use a regular length stem on my Rolfs with the Silca chuck, the chuck cannot go far enough on the stem to seal. Not a problem with longer stems. In fact, it seals too well. I ruined a tube trying to get the chuck off this past weekend.|
Jan 22, 2002 3:27 PM
|The current generation of Silca pump heads are pretty crappy and I'm long time Silca fan since 1974. Do everything right and you wear out the rubber hicky in time - even after tightening the compression nut. Have a buddy with the "other" style of valve stem and you're forever reversing the internal components. Some day some one will forget to reverse the internal plastic part and it will break when you shove a presta stem into it. Relief from this endless madness of planned obselecence can be yours from Topeak for about $12. They make a kit that is a replacement hose with either a double head (with lever) or a universal head. You instal this kit and your pump will always seal, always be ready to go, you'll never have to fiddle with parts again or screw the head onto a schraeder valve. It's so easy. I did this conversion a couple years ago and haven't had any concerns since. When we show up for a ride people prefer to use my pump even though everyone has a Silca. |
Always tap the presta valve loose from it's seated position before you attempt to inflate - it sticks.
|It all sounds very familiar!||Dutchy|
Jan 22, 2002 4:28 PM
|I have the same problems with my Silca pump. The rubber seal wears away after a while and air starts
rushing out the side. The tube valves have threads so this wears out the rubber quicker. Thanks to
the person who pointed out that Michelin has threadless/smooth valve stems, I'll have a look for these.
The alternative is to have several "rubber seal rings" spare, but down here in Aus they charge $4 for a
piece of rubber!
Jan 22, 2002 5:52 PM
|I came across this adaptor that has an O-ring at the bottom and threads on to the stem's dust cap threads. The O-ring seats on the shoulder just below the cap threads.
This adaptor is fitted in the Super Pista's Presta chuck, and also fits and works very well in the Blackburn floor pump's Schrader head from which it originally came. I inflate tires before every ride and deflate afterwards and this setup has worked without fail for many years now....