rebuilding Marzocchi forks 38mm

Part 34 is a crude one-way valve. If I'm recalling the whole thing correctly, then it sits up against the steel ring with the three cutouts on the inside, and is kept captive in a counter bore in the aluminium insert in the bottom of the fork leg.  Oil flowing in one direction will push part #34 down against the flat face of the aluminium insert, forming something of a seal.  Oil flowing in the other direction pushes it against the steel ring with the cutouts, which creates an annular area for oil to flow past it.  Therefore I guess it must be that the smaller diameter end of part #34 sits up against the steel ring with the cutouts.
In the end this may not be your problem but that is what it does and it's worth a look.
Cheers
SteveB
 
thanks breganzan,, i will check again... i will try also with 15w oil..

only thing that I could accidentally changed "up-down direction"  is this alloy thing on picture marked with arrow..
p9250353.jpg


here is video about how one fork behaves.. i will add one video,, how the fork is behaving  https://www.youtube.com/watch?v=Yp0tiP9RElg&feature=youtu.be

thanks
 
sorry, now video link should be OK

Have to say that I checked how forks were reassembled again,, and  I'm quite sure, that all parts are as before. I can see wear marks, on alloy parts, where have contact with steel parts.
I put 15w oil inside, and can't notice any difference in damping, only all together seems more "hard".

Tried also , if they are damping when open, with oil, without spring.. but the damping is really weak.  If I compare to rear marzocchi strada froks, withoit springs on,  when rebuild. Strada are behaving normal,, they go "down" fast, and "out" they have resistance - I call that damping..






 
nope... I think that you are wrong... the spring "damps" down,, and oil shock absorber - "amortiser"  prevent jumping. If  shock absorber dont do his work (damping) the bike would jump like spring usualy do..

That pic before was taken from Rob theme here in the past http://www.laverdaforum.com/forum/index.php?topic=80283.15 

as you see in picture, are two types of forks.. mine interior is same that is on that picture..
 
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