Broken? Crankcase breather valve

[tshearman]

Hey everyone,

I have a 99 Ducati Monster 750, though I think this part is pretty universal. I was removing the crankcase breather airbox and accidentally ripped off the top of the crankcase breather valve... I know.

Is it broken and in need of replacement? The line on the piece is so clean that I can't believe I broke it off, but I can't get it to confidently reseat. Seems like all it wants to do is fall off now.

Was it glued on?

For a bit more description, the piece that came off exposed the reeds, but doesn't seem to have more than a single thread.

[koko64]

Sounds like the later plastic type and its broken on the "seam". Sound right to you?

[tshearman]

It's definitely plastic, and I suppose it could have broken along a seam.

So you suspect it's definitely broken and needs replacement? Could I repair it with some plastic weld or something?

[tshearman]

Has anyone seen/used these?

http://goo.gl/MKyprI

Seems like a simple part but then again, I hardly know.

[koko64]

Not sure as I don't know the brand but someone here might.
Forum sponsors have proven options and some brands have warranties.

[koko64]

Just looking at one of these plastic breathers, it appears they are two pieces bonded together after the reed valve is added during mfr. Maybe you can epoxy it, but excess epoxy running down into the unit could seize the reed valve. Comparing it to the earlier alloy unit, it did not flow as much air with a simple, non scientific blow through test.

[tshearman]

Awesome. Thanks for your help. I'm going to delicately and carefully try some epoxy and hope for the best. Worst case I have to replace it...

Mind if I ask where you found the manufacturing diagram/information?

Thanks!
Toby

[koko64]

I could tell having a good close look at it. It wouldnt unscrew either and I knew it wasnt far off snapping in my hands.
Either that or Im getting feeble.
The reeds dont open as far as the early type. Not sure why.

Choose a good epoxy.

[SpikeC]

 I would use JB weld for this application. I find that if I do a bit of molding around the perimeter of this sort of thing that I get a more permanent repair, and it does not seem to be bothered by engine heat.