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beepbeep beepbeep is offline
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Join Date: Jun 2001
Location: Sweden
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Your back plate doesn't seem to have recessed groove where O-ring should seat so it's possible that you have some other version of BOV where back plate doesn't have O-ring but a rubber pad.

That part of tube doesn't live as hard life as the one with O-ring (piston is accellerated by spring), so O-ring is probably chewed by piston hitting it. I suggest replacing both with some sort of hard rubber. Clunking sound comes probably from piston hitting the O-ring. As you can see, pistons has chewed trough O-ring gasket and divided it into two rings. If you compare your pic to mine, you'll see that inner part of gasket has separated on your BOV and piston is making metal-to-metal contact.
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Last edited by beepbeep; 12-07-2007 at 01:02 PM..
Old 12-07-2007, 01:00 PM
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