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Silca pump rebuild?(9 posts)

Silca pump rebuild?Suddha
Jan 6, 2003 8:46 AM
My five-year old Silca is acting funny. I was pumping my tires last week and the gauge needle would swing up and then back to 0 psi with each stroke. Then the handle would rocket up to the highest position and it required considerable effort to push it down. I was able to fill the tires, but I suspect the pump is in need of repair. Seems like there is a check valve in there that isn't working properly, as the pressure from the tire is seeping back into the pump cylinder. Does this sound right? How do you rebuild these?

Shall I rebuild or buy new? There is a cool German-made SKS aluminum pump at REI that I've been eyeing. Only $40... and with my discount (yeah, I work there part-time), it would be quite cheap. Any word on SKS pumps? Seems nice.

re: Buy the SKS and send the Silca to me.dzrider
Jan 6, 2003 9:38 AM
The specific problems sounds like the little plunger on a presta valve wasn't screwed all the way out or depressed all the way. The most common repair on a Silca pump is replacing a worn washer in the pump head. Total cost $2.00, total time 2 minutes. I'd try that first
re: Buy the SKS and send the Silca to me.Suddha
Jan 6, 2003 9:44 AM
Thanks for the tip... I assume I can pick up the spare parts for the Silca at my LBS.

I don't think it was my Presta, since I had the same issue on both road tires and on my MTB as well.
re: Buy the SKS and send the Silca to me.flying
Jan 6, 2003 10:38 AM
Actually your pump is backfilling with the air from your tire.
I forget the reason for this but ist has to be the head or the leather plunger gasket inside.
Silca pumps never die ;-)
Excel has the parts cheap.
Stuck checkvalveMR_GRUMPY
Jan 6, 2003 11:18 AM
There is a checkvalve in all pumps that prevents air from returning from you tire. Yours is stuck or broke. At the bottom of your pump, there is a removable acess bolt, I believe the check valve is in there. Try cleaning it. If that doesn't work, your shop can order a replacement from Quality.
Stuck checkvalveSuddha
Jan 6, 2003 11:27 AM
Sounds right to me... I suspected a check valve. I'll open the access bolt and have a look. Maybe lubing would help too. I ordered the washer and leather gasket from Excel Sports - a whopping $4 total. Thanks for the tips, guys.
Stuck checkvalve or broken springPicshooter
Jan 6, 2003 3:50 PM
Mine had the same symptoms. The spring on the check valve was broken. I replaced it with a spring from a ball point pen. That lasted until I received my genuine Silca valve.
Maybe notKerry
Jan 6, 2003 6:07 PM
The problem with your "pump checkvalve" theory is that the Presta valve itself is a check valve. The minute you let the pressure off from the pump, the Presta valve closes. So, where does the pressure come from? Add to this the fact that your chuck is not sealing well, suggests to me that your problem is most likely a bad rubber grommet in the pump head. The grommet is depressing the Presta valve and is not sealing well around the valve stem. Before you spend money on anything else, replace the grommet.
re: Silca pump rebuild?miko
Jan 6, 2003 3:21 PM
I have a 15 yr old silca. I've experienced what you described occasionally. Try letting some pressure out of your tires first, before pumping. If they are too full when you start an "air lock " occurs.