Fork oil... this is not looking too clean- comments please! - MVAgusta.net
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post #1 of 9 (permalink) Old 01-02-2018, 03:19 PM Thread Starter
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Fork oil... this is not looking too clean- comments please!

So Eljonos fork workshop is in full effect, in our laundry room (hush, or the missus will hear us!)!

Now, check out this funky oil removed from the LH/rebound leg. It looked reasonably good while pouring out from the main chamber, but once I started pumping the dregs out of the cartridge, it turned to this. Pic 1 side on, pic 2 taken through bottom of clear container, with ceiling light above.


Is it normal to find this amount of crud?


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post #2 of 9 (permalink) Old 01-02-2018, 03:27 PM Thread Starter
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Update: the preload spacer is made of cheapo plastic, and the ends are not chamfered. Looking st below pic, looks like the spring bottom has been grinding away at it.

Plausible explanation?


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post #3 of 9 (permalink) Old 01-02-2018, 03:28 PM
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Likely brake dust and road debris that accumulated on your fork leg and risen up past the seals.
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post #4 of 9 (permalink) Old 01-02-2018, 03:32 PM
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I presume your doing a cartridge upgrade kit? what tools are you using? Im planning on doing this pressurized ohlins kit myself and need the specific tools.
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post #5 of 9 (permalink) Old 01-02-2018, 03:41 PM Thread Starter
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Quote:
Originally Posted by MV Arthur View Post
Likely brake dust and road debris that accumulated on your fork leg and risen up past the seals.


Brake pad dust might just be spot-on! Certainly fits with the fineness of the suspended particles!

Also, I almost lost the leg out of the sleeve when I turned the leg upright after emptying it first time, which may have pulled some of it past the seal. Will investigate, but Iím not excited at the prospect of a full tear-down and clean of cartridge and all!


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post #6 of 9 (permalink) Old 01-02-2018, 03:49 PM
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Quote:
Originally Posted by Eljono View Post
Brake pad dust might just be spot-on! Certainly fits with the fineness of the suspended particles!

Also, I almost lost the leg out of the sleeve when I turned the leg upright after emptying it first time, which may have pulled some of it past the seal. Will investigate, but Iím not excited at the prospect of a full tear-down and clean of cartridge and all!


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Not sure which bike you have but on the F4 there's a big c clip retainer that secures the leg at full extension. So no need to worry unless you're doing it over a glass table!

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post #7 of 9 (permalink) Old 01-02-2018, 03:58 PM Thread Starter
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Fork oil... this is not looking too clean- comments please!

Quote:
Originally Posted by GCBC View Post
I presume your doing a cartridge upgrade kit? what tools are you using? Im planning on doing this pressurized ohlins kit myself and need the specific tools.


After very, very nearly forking out for a Mupo LCRR kit, I actually got a grip on myself, forked out the cash for a new rear shock with all bells and whistles instead, and elected to change only springs and oil in the fork, since it already has a fair bit of adjustability. THEN change to cartridge when I still yearn for more, lol!
All kidding aside: my 4 year old forks came apart very easily.
You will need, assuming Marzocchi 43mm USD with preload comp and rebound adj:

22mm spanner or socket (preload adjust)
32mm for top cap (bought a pro works plastic ring spanner for this, but with care should be able to loosen it without marking)
19mm spanner for inner piston lock nut.
Tool to separate spring from lock nut - make yourself or be lazy and buy a plastic one like me. This is a must unless you have 4 hands. You will be able to pull down the spring manually.
Once youíve poured out oil, spring andpreload spacer, the cartridge will come out by loosening the 6mm hex at the fork bottom.
Thatís all you need, as inferred by Ed in a separate post when i posed the same question



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Last edited by Eljono; 01-02-2018 at 05:03 PM.
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post #8 of 9 (permalink) Old 01-02-2018, 06:44 PM
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Quote:
Originally Posted by MV Arthur View Post
Not sure which bike you have but on the F4 there's a big c clip retainer that secures the leg at full extension. So no need to worry unless you're doing it over a glass table!

A 2014 flat-bar, naked F3-like thingy with mx-style rear.... Got it?

What a beast of a motorcycle!
It growls and rages and flies across the tarmac like a wild animal that has escaped the confinement of a cage and after merely waiting restlessly until the release, will not endure being locked up ever again.


Skye I miss you. L'essentiel est invisible pour les yeux.
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post #9 of 9 (permalink) Old 01-03-2018, 03:15 AM Thread Starter
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Quote:
Originally Posted by MV Arthur View Post
.. there's a big c clip retainer that secures the leg at full extension...
C clip confirmed!
Lol at the glass table... I can just imagine!

Jonathan
Southern Norway
2014 flat-bar, naked F3-like thingy with mx-style rear
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