Post by: Flodabo on March 10, 2020, 02:36:23 AM
I am puzzled by the arrangemend in my k75s 1987 forks. In this attachment from repair manual i can see that valve housing (8) should be present on both dampers but it seems to me that one is missing. Here is some picture with dampers.
bmw-k100-k75repair-manual-272-638.jpg (25.72 kB . 407x576 - viewed 545 times). My dampers
IMG_6717.JPG (36.22 kB . 768x576 - viewed 546 times) IMG_6716.JPG (61.82 kB . 768x576 - viewed 567 times)Am i wrong or i should have this valve housing?
Next weird thingee...
When i extracted the stanchions from sliders, on the bottom of sliders i found one spacer in each slider, shown in this manual picture as number 17 .
bmw-k100-k75repair-manual-264-638.jpg (20.89 kB . 407x576 - viewed 660 times)But these spacers were not on same position.Here is how i found them:
IMG_6720.JPG (60.98 kB . 768x576 - viewed 500 times)As i understand only a valve and 2 o-rings should be the only difference between left and right damper. But my findings are confusing. Can someone shine some light here please, would appreciate it!
Post by: Laitch on March 10, 2020, 04:35:42 AM
Am i wrong or i should have this valve housing?One of the challenges of understanding BMW's instructions is their occasional inaccuracy or inconsistency in translation from German to English. Another challenge is that in the line drawing diagram you have attached, the right-side tube is on the left side of the diagram and the left-side tube is on the right side of the diagram. That's a typical format but sometimes understanding can be elusive after sleep and coffee deprivation.
As understand only a valve and 2 o-rings should be the only difference between left and right damper.
:laughing4-giggles:
In the BMW manual's halftone photos—which you have attached—one part in each tube is labeled a valve housing; however, in the same manual's line drawing diagram of the tube assembly—which you also have attached—one of the valve housings is labeled a bushing. When I consult MAX BMW's parts fiche, the part in the right tube is labeled a bushing and the part in the left tube is labeled a housing. They might look exactly the same, or not; internal differences can't be determined by looking at the diagrams. In MAX's fiche, their part numbers are different but their prices are the same. As I consider reassembly, both the tubes should have either what is labeled in the fiche as a valve housing or a bushing. That will depend upon whether the tube is left-side or right-side.
When I compare the tubes in the line diagram, the left tube has 13–a sealing ring, 14–a coil spring, and 15–a valve; the right tube does not. The coil spring is not in your list of differences. The right tube has 9–the bushing.
If this were my project, I'd reassemble using the names found in both the line diagram and the fiche because they are the same. I'd assemble parts according to BMW's diagram. I'd insert the bottom spacers with their narrow sides downward in both tubes.
Perhaps mlytle might illuminate this further because he has rejuvenated that style of fork during work on his K75S Bricks.
Post by: Flodabo on March 10, 2020, 06:23:44 AM
The tranlation sounds like a german joke.
I dismantled dampers from stanchions. And surprise surprise...
IMG_6728.JPG (61.67 kB . 768x576 - viewed 504 times)One bushing/housing (if not obvious the one with a finger on it) looks like a piece of pipe?!It´s not aluminum, like the other one and definitely not the same shape. Someone replaced the bmw bushing/housing? It doesn´t look like something Bmw would use?
Post by: Laitch on March 10, 2020, 10:48:58 AM
You should be keeping the parts of the left and right assemblies separated from each other. Assemble the parts you have according to the photo and the diagram from the BMW manual. What is missing? In your photos, identify which part housing/bushing came from which fork leg. Where is the #14 spring from the line diagram?
Post by: volador on March 10, 2020, 12:30:55 PM
Left tube double action hydraulic damper provides compression phase and rebound phase
16 31 42 1 454 621 VALVE HOUSING (to 08/91) 0.09 1 $8.62
from Technical features in detail
The hydraulic damper unit consists of an aluminum tube with piston and a Teflon sealing sleeve, a rebound stop spring and the valve
housing. There is a spring-loaded aluminum ring between the filler disk and the light alloy valve housing. During the compression phase
it allows the oil to flow, so that damping is only slight. As the rebound phase starts it shuts off the valve passage, with an o-ring to reduce
noise and ensure freedom from leaks. The oil then flows through a calibrated bore into the pressure-stage area of the damper.
The valve housing is secured without play in the fixed tube by means of a disk and a Seeger clip.
Post by: Flodabo on March 10, 2020, 06:04:05 PM
Where is the #14 spring from the line diagram?Found it
IMG_6730.JPG (58.37 kB . 768x576 - viewed 492 times)Damper with spring and 2 o-rings and aluminum bushing/housing was in left leg.
Post by: Flodabo on March 10, 2020, 06:10:09 PM
Right tube compression damping only #09 31 42 1 457 601 BUSH (to 08/91) 0.14 1 $8.62
Left tube double action hydraulic damper provides compression phase and rebound phase
16 31 42 1 454 621 VALVE HOUSING (to 08/91) 0.09 1 $8.62
Thank you Volador.
I see you found some prices. Do you have a link please?
Post by: volador on March 10, 2020, 06:23:06 PM
Check parts compatibility with BMW MAX Microfiche, BOBS BMW, REAL OEM
https://shop.maxbmw.com/fiche/PartsFiche.aspx
https://shop.maxbmw.com/fiche/PartsSearch.aspx
https://parts.maxbmw.com/BMW___BmwMotorradK.html
https://www.bobsbmw.com/store/microfiche/BrowseSeries.aspx
https://www.realoem.com/bmw/select.do?kind=M&arch=1
https://www.ascycles.com/BMW-Motorcycle-Parts-Fiche
Cross reference parts like Bosch pn#'s, etc.... http://partsplusecat.com/
No spaces in the part number
Parts Vendors
https://www.beemerboneyard.com/
https://www.capitalcycle.com/
https://www.euromotoelectrics.com/
https://www.tills.de/
Headlight relay stuff if you chose to add one
https://www.motobrick.com/index.php?topic=268.0
http://www.motobrick.com/index.php/topic,4962.msg30932.html
http://culayer.com/product/matchbox-headlight-relay/
http://easternbeaver.com/Main/Wiring_Kits/H4_Kits/h4_kits.html
Eastern Beaver site for electrical connectors,plugs, etc...
http://www.k100-forum.com/
http://www.kforum-tech.com/Tech-page.html
http://www.kforum-tech.com/electrical/EFI/bike-wont-start-EN.htm
http://www.kforum-tech.com/Downloads/electrical/diagrams/interactive_diagrams.htm
http://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/k100tshoot/K100.Troubleshoot.Start.2018.pdf
http://kbikeparts.com/index.htm
http://www.kbikeparts.com/classickbikes.com/ckb.tech/ckb.new2k.htm
http://www.kbikeparts.com/classickbikes.com/ckb.tech/ckb.tech.toc.htm
http://www.eilenberger.net/K75S/IgnitionSwitch/
http://www.verrill.com/moto/moto.shtml
this site has a lot of good info and breakdown pictures in the tech and tech resources sections for K1100 alot of the parts are on K75 & K100
http://www.k11og.org/forum/index.php?sid=2df953dde5715fd9001fbe69edec5ad0
https://ibmwr.org/index.php/k-bike-tech-articles/
This site has all kinds of technical specifications on all the BMW models http://www.bmbikes.co.uk/mechanicalpages/kseriesmechanical.htm
http://largiader.com
Good Day
Post by: Flodabo on March 10, 2020, 06:32:54 PM
Post by: volador on March 10, 2020, 06:41:47 PM
That is gold! Thank you a lot!
patreon, venmo, paypal, bitcoin, libra, gladly excepted (http://www.motobrick.com/index.php/topic,550.0.html)
Post by: Flodabo on March 10, 2020, 06:43:01 PM
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And it seems like it adds up.
Only thing that stil botheres me is that in the left leg, the spacer (#17 in this image) was upside down- with the wider side down.
Post by: Flodabo on March 10, 2020, 06:48:29 PM
patreon, venmo, paypal, bitcoin, libra, gladly excepted (http://www.motobrick.com/index.php/topic,550.0.html)
That´s a good reminder! I did some small contribution late last year. I´ll definitely do it again soon.
Post by: Flodabo on March 10, 2020, 06:54:03 PM
https://forums.bmwmoa.org/showthread.php?51752-94-k75RT-Shock-Bolt-loose-and-ovaled-out&goto=nextnewest
As always Laitch, you are right. 112350
Post by: Laitch on March 10, 2020, 07:30:45 PM
So i found this image:You found that image already. It's the same image that you attached in Reply#2; it has just been modified with the number 18 which probably indicates the entire assembly on a legend somewhere in another reference book.
Only thing that stil botheres me is that in the left leg, the spacer (#17 in this image) was upside down- with the wider side down.
People fail to assemble things correctly. Don't let that bother you unless you have paid them to assemble something. We all are flawed. Just assemble the components according to the line drawing and include all the parts on the line drawing in all the positions on the line drawing to the best of your understanding. Fill the tubes with the correct amount of fork oil. Use mid-weight oil—7.5W. If you don't like the ride after that, use lighter or heavier weight oil, lose or gain body weight by bingeing or starvation, or just adapt.