Preload oil fill - BMW Luxury Touring Community
 
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post #1 of 16 Old Oct 12th, 2011, 5:10 pm Thread Starter
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Preload oil fill

Just another thought on filling the preload adjuster with the disappearing oil.

I turned up the preload adjuster then placed a piece of soft copper wire, approx 1/4"diameter, between the top of the shock and preload collar. Then released the preload adjuster, this kept the spring from expanding all the way and the collar retracting to the stop. This will allow you to overfill the adjuster. I rotated the adjuster CW, removed the wire the rotated the adjuster to full CCW. After doing this I slightly cracked the banjo bolt to allow the excess fluid to bleed out. Be careful if you do this, an oil injection injury is not fun.
I now have full travel with resistance felt out of the gate.

Just a thought.
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post #2 of 16 Old Oct 13th, 2011, 7:26 am
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Re: Preload oil fill

Quote:
Originally Posted by New2rt
Just another thought on filling the preload adjuster with the disappearing oil.

I turned up the preload adjuster then placed a piece of soft copper wire, approx 1/4"diameter, between the top of the shock and preload collar. Then released the preload adjuster, this kept the spring from expanding all the way and the collar retracting to the stop. This will allow you to overfill the adjuster. I rotated the adjuster CW, removed the wire the rotated the adjuster to full CCW. After doing this I slightly cracked the banjo bolt to allow the excess fluid to bleed out. Be careful if you do this, an oil injection injury is not fun.
I now have full travel with resistance felt out of the gate.

Just a thought.
That's pretty clever, and I believe a 1st here.

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post #3 of 16 Old Oct 13th, 2011, 10:34 am
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Re: Preload oil fill

That's a keeper.

JD

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post #4 of 16 Old Oct 13th, 2011, 11:01 am
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Re: Preload oil fill

Nice idea! I like it too. 1+ on that, my friend.
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post #5 of 16 Old Nov 7th, 2011, 5:28 pm
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Re: Preload oil fill

OK !
I serviced my rear suspension preload adjuster using New2rt's method, and found Joy !

I used a spacer made of two .060" aluminum, glued together.

Very nice trick !
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post #6 of 16 Old Nov 7th, 2011, 8:17 pm
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Re: Preload oil fill

I beg to differ, first of all a 1/4 inch of anything would be a small bolt.
Secondly the collar is held in place by an allen set screw against the tube,
Thirdly the collar does not move, there is extreme spring pressure pushing it against the wire stopper.

I believe there is a hydrolic force going on here similar to a shaper head that can be locked onto its axle by grease pressure.

The collar simply does not move.

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post #7 of 16 Old Nov 7th, 2011, 8:32 pm
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Re: Preload oil fill

I added a little jack oil in mine a few days ago. I used the syringe I get my vitamin B12 with. No fuss no muss

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post #8 of 16 Old Nov 8th, 2011, 5:52 am Thread Starter
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Re: Preload oil fill

Quote:
Originally Posted by rhawk
OK !
I serviced my rear suspension preload adjuster using New2rt's method, and found Joy !

I used a spacer made of two .060" aluminum, glued together.

Very nice trick !
Much better idea using your spacer rather then wire, distributes the load evenly between the collar and housing.
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post #9 of 16 Old Nov 8th, 2011, 6:06 am Thread Starter
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Re: Preload oil fill

Quote:
Originally Posted by MountianMama
I beg to differ, first of all a 1/4 inch of anything would be a small bolt.
Secondly the collar is held in place by an allen set screw against the tube,
Thirdly the collar does not move, there is extreme spring pressure pushing it against the wire stopper.

I believe there is a hydrolic force going on here similar to a shaper head that can be locked onto its axle by grease pressure.

The collar simply does not move.
I don't have foolish pride so you don't have to beg to differ.

To try and help you understand, the preload adjuster works by extending a piston in the preload housing attached to the shock. The piston pushes down on a collar that sits on top of the coil spring. You place a spacer between the collar and housing to keep the piston from fully retracting when the adjuster is released allowing more oil to be added.
The 1/4" spacer is actually overkill and I wouldn't use a steel bolt, it can mar or crack the housing. The allen grub screw doesn't do a whole lot other then to keep the housing from turning and/or to hold it in place against the retaining clip until the spring is released.

I'm not familiar with a shaper head locked to and axle???

Hope this helps.
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post #10 of 16 Old Nov 8th, 2011, 8:25 am
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Re: Preload oil fill

I understand what you're doing but for the life of me can't figure out why...

Overfilling the adjuster will just cause the shock to leak out the excess oil till it reaches equilibrium.

I can see no advantage to overfilling the adjuster.. Filling with it all the way out should get you full travel as well..

Just sayin'...

John

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post #11 of 16 Old Nov 8th, 2011, 8:56 am Thread Starter
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Re: Preload oil fill

Quote:
Originally Posted by JPSpen
I understand what you're doing but for the life of me can't figure out why...

Overfilling the adjuster will just cause the shock to leak out the excess oil till it reaches equilibrium.

I can see no advantage to overfilling the adjuster.. Filling with it all the way out should get you full travel as well..

Just sayin'...

John
The preload adjuster has nothing to do with the shock absorber itself, it is a seperate unit (master and slave system) so the oil won't leak from the shock.

It's a sealed system so it won't leak out the oil unless the piston over travels and blows out the seal. This is the reason I said to crack the line when you are finished to bleed out excess oil. You can't remove all the air or fill it completely without doing this unless you remove the assembly and submerge it in a bucket of oil and that's not practical.

As I said on the first post "just a thought" do it, don't do it, doesn't matter.

I'll tap out now.
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post #12 of 16 Old Nov 8th, 2011, 9:24 am
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Re: Preload oil fill

Sorry, didn't mean to step on your toes, But,

The original oil went somewhere..As in it leaked out...

Overfilling the preload section of the shock will just cause it to leak out that much more..

Just can't see any benefit from it...Overfilling...

John

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post #13 of 16 Old Nov 8th, 2011, 9:31 am Thread Starter
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Re: Preload oil fill

I'll tap in for the last time on this.
Think of it as changing a brake line, you can fill it with a syringe then install the banjo bolt but that's not enough, you need to bleed it. Simply put you're over filling then bleeding. Same idea of your brake system but different way to do it, no bleeder screw and no easy access to a res..so if you want you can do it this way.
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post #14 of 16 Old Nov 8th, 2011, 9:36 am Thread Starter
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Re: Preload oil fill

Quote:
Originally Posted by JPSpen
Sorry, didn't mean to step on your toes, But,

The original oil went somewhere..As in it leaked out...

Overfilling the preload section of the shock will just cause it to leak out that much more..

Just can't see any benefit from it...Overfilling...

John
You're not stepping on toes,
If it leaks over time it leaks over time this is just a way of topping it off. It won't cause it to leak any more or less. You're not keeping it overfilled, you bleed off the excess.
See post 13.
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post #15 of 16 Old Nov 8th, 2011, 9:56 am
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Re: Preload oil fill

OK, Guess I missed the bleeding off the excess...Now I can be on the same page..
You'd for sure for sure have it full..
As you said. Oil injection injuries are painfull..... So, Be carefull on that part...

John

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post #16 of 16 Old Nov 8th, 2011, 10:08 am
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Re: Preload oil fill

Thank`s for the info and tricks guys. Like I said, NOTHING BUT A WORLD OF KNOLEDGE AND INFORMATION IN THIS FORUM.

2007 K1200LT STORM GREY V.O.I.C.E. II COMM. MOTORRAD NAV lll. 2004 SUZUKY HAYABUSA WITH NITROUS AND MORE.
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