Marzocchi 66 RC3 banging when fully expended

NIRAN · Nov 24, 2010

hello, so my bike were upside down for two days and while upside down i compressed my fork a few times and went along doing my business, now that they are upside right my 66 fork is making a banging noise when it extended - it compresses then when it extends it hits the top of the fork legs or something forcefully and i can fill it with every stroke.

it has been two days now with no improvement, there was no oil leek how can i fix it?

thanks

LonesomeCowboyBert · Nov 24, 2010

If its fully expended, then of course youll need a new one:ihih:

.......sorry but you asked for that

(its probably just the cart needs bleeding)

LonesomeCowboyBert · Nov 24, 2010

Nice edit........but you forgot the title:thumbsup:

.............and you didnt say anything about the genuine advice........ungrateful wretch.......hehe

NIRAN · Nov 24, 2010

hey

i didnt have time to write, so thanks for your advice.

and how do i go on about bleeding the cart?

Nick_M2R · Nov 24, 2010

The oil drained out of the damper when you had it upside down

Turn it back up, let the oil drain down, then pump the fork about 30 times and you should feel and hear oil being pumped into the damper

NIRAN · Nov 24, 2010

i have done that already 2 times (i rode the bike for 2hrs), all the settings on the fork work well but it still has this knocking sound when its extended...

maybe i need to pump the fork it some angle or something like that?

LonesomeCowboyBert · Nov 25, 2010

I guess its possible that the oil level was barely enough to start with and now not all of it has returned to the damping cartridge (I cant imagine where it went but perhaps its in some little internal recess somewhere)_

Solution = top up with perhaps 10 ml of oil and try again. dont put any more than 10 ml in it

nightnerd · Nov 25, 2010

Can you get any rebound damping at all? If not, maybe the cartridge inside is unscrewed from the top cap.

NIRAN · Nov 25, 2010

all the settings on the fork work completely normal... man that's odd...

nightnerd · Nov 25, 2010

Hum, then its probably due to a lack of oil in the leg that has the rebound cartridge. Add 10mm at a time. Try and then add 10mm more if not solved.

NIRAN · Nov 25, 2010

what kind of oil mrz 66rc3 needs? 7.5?

LonesomeCowboyBert · Nov 25, 2010

If your just topping up 10 ml of oil, you can use 5 cwt, 10 cwt or even 20 cwt, its such a small percentage of total oil volume in the leg, it wont make a difference any human being could detect

(edited for clarity)

NIRAN · Nov 25, 2010

ok thanks alot guys for the info

i think its a lack of oil aswell

1+1 · Nov 26, 2010

You sure your rebound is not set too fast? Happens all the time with my 888 with fast rebound.
Also an oil change, rebleed would make it all good again.

NIRAN · Nov 26, 2010

yep, even when i use the slowest rebound and pull the fork alil by hand (it wont go all the way up, there is like 1CM left of travel, maybe less...) i can feel it reaching the end of travel and banging on top...

so i guess ill just service it myself... i hope its not too complicated, i watched a video TUT on you-tube where he serviced his 66 RC2X i think my fork is pretty similar

Marzocchi 66 RC3 banging when fully expended

NIRAN

LonesomeCowboyBert

LonesomeCowboyBert

NIRAN

Nick_M2R

NIRAN

LonesomeCowboyBert

nightnerd

NIRAN

nightnerd

NIRAN

LonesomeCowboyBert

NIRAN

1+1

NIRAN

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