Avon c7 valve repair

[John U]

Topped up the tubes in my bro's garaged 2002 Adventure 4.5 yesterday and noticed that a couple of the C7 valves were relying on the dust cap seal to retain pressure and were leaking a bit internally from the diaphagm. I blipped them a few times but didn't get a reliable seal, so attention needed before relaunching I think!

I see there is a repair kit available for C7 valves consisting diaphragm & spring etc, but I can't find any instructions on how to install it!

Any one got any experience of replacing C7 inards - is it a DIY non-glue job, any special tools required?

Grateful for any advice please.

Cheers

John

[gotchiguy]

I had a Zodiac Pro before the Osprey, and I also had the same thing happen - I think that the valves are the same though maybe not?- Inside the cylindrical sort of thing there's a sort of "sticky out little pole bit" if you twist that and make sure its pulled out as far as it will go it should reduce leakage a little, though I think the dust cap is supposed to be the final air tight seal. My tiny zodiac tender requires the dust cap screwed on fully to complete the air lock so I think its a common design feature.

Unless the tubes deflate significantly, I think there is nothing to worry aboput#!!!

[Ribshop]

Replacing the C7 diaphragm is really easy as the body of the valve can be removed from the tube.

You need to unscrew the valve using a C7 valve spanner, being careful not to loose the backing nut, you then have access to remove the diaphragm from from the pin and install a new one.

If you click on the link it will take you to a diagram of the valve.

http://www.rib-shop.com/product.asp?...hFor=&PT_ID=60

Hope this helps

[Nasher]

I replaced my inserts usng the technique detailed on RibShops site after I purchasing the inserts from them, and it really was quite straight forward.

The string is key to not cocking it up.

Good Luck

Nasher.

[John U]

Thanks for all the help and advice guys.

I feel confident to tackle the job now and will source the parts and spanner appropriately!

Cheers

John

[Downhilldai]

Piece of Pi$$.

Make sure everything's nice and clean when you re-assemble - no sand, grit, etc. in the valve.

[biffer]

if you dab a little bit of sealer on the backing nut the next time you need to take it out you wont loose the nut, just don't get any near the threads.