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First foray into fork rebuilding

dorkburger

Forum Guru
Past Site Supporter
In my 23 years, of GS ownership and 3 GSs, ive never had to rebuild forks. Unitl Friday.
Apologies for the lack of pictures, but they all came out blurry....

This project was backburnered, so when I finally got the parts, I eagerly got into it.
I removed the brake calipers, wheel, and since I was replacing the front fender, that too.
Not knowing if / how much I would need to raise the bike to remove the lower fork parts, I put the bike on the centerstand, then slung straps over the garage rafters and hooked them on the handlebars for extra support and safety.

With that sorted, I tried loosening the allen bolt at the bottom of the fork, but the fork bottom spun....
I would later find out that I was beginning to go down the wrong path... I put the fender back on to keep the forks from spinning, and went back after the bolt. At this point, the bolt turned, but I could feel that something inside was spinning, not loosening.
I consulted the factory manual, and it did not show much detail of disassembly. Clymer showed more....and the need for a special tool to hold the damper assembly.....

For some stupid reason, I didnt think this applied to my bike. This discovery was followed by a bit of frustration and anger.
I then recalled seeing here on occasion, homebrewed tools for this, so I gave it a go. I took a piece of 3/8 threaded rod and sandwiched a 5/8 nut between two 3/8 nuts.... too big. I next tried two 3/8 heavy nuts (11/16 wrench size). I could feel then catching a bit, but not enough. I thought it was the mismatch in shape, so I ground the points of the nuts a bit. No good. Turns out they were a bit too small, and I had no 7/16 nuts on hand to try. I ended up pounding the living she-it out of them, which made them wide enough to hold and allow me to complete disassembly.

I did one side at a time so I had one to look at if I goofed up. The slide metals, oil lock, wave washers and seals were replaced,
Assembly was initially a bit tricky because the oil lock and washers initially wouldn't stay put. A little fork oil was all that was needed to keep them in place. If this was done with the forks removed, it would have been a non issue. The last part, driving in the seals was a problem also. Turns out the top slide metal pieces didn't seat properly, preventing the seals from going in. Once that was discovered and addressed, everything slid in. While fighting with the seals, I put a couple of small dings in the fork tubes. Fingers crossed that they dont cause a problem. I filled them with oil and wrapped it up.

Ive yet to take a long ride to check, but did take a couple of short ones to the hardware store. One thing I happily noticed was that I can take my hands off of the handlebars and they dont start into a shake.

I havent been and to donthat in several years......

It took me about 3 hours, with 45 minutes or so figuring out the "special tool"
 
Nice work.

In the shop I learnt to use the rattle gun (air impact wrench) on the damper bolts with the fork springs in place. The fork springs pre-load stops the damper rod from spinning. I never came across one that didn't come out this way. No need for special tools.

We used to clamp the caliper mount of the fork in the soft jawed vice so the fork sat almost horizontal (angled slightly down so the cap end was lower). This way no oil came out with the damper bolt. Then sit them upright in a bucket to drain (grab a cup of tea) before further dismantling.
 
I wondered if an impact driver would do it, but I only have a little one I use for work, and no allen bits.
 
I did some for maybe 2 bikes. Had just as hard a time as you did.
After making that special tool (nut on the end of threaded rod), I got it done.
I've since found an impact wrench at a garage sale, so I'll do it that way, if I am so cursed with bad fork seals again.
What kind of offering would Hephaestus accept?
hephaestus_by_chrisappel-d3bkj9j.jpg
 
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I'll bet any kind of money, he always wore a leather apron. (That makes sense to me :stupid:)
 
Just a side note, the damper rod, like everything else on your Suzuki, is metric

Your tool should be made with metric bolt and nuts (17mm, IIRC)
 
Interesting. Shining down the tube with a light, it didnt appear to me to be a hex shape. Hopefully there wont be a next time with this bike, but if so, maybe I should do a full disassembly.....
 
Not hex, it's 12 point. 3/4" wrench sized nuts works fine.

Yep -- on most GS models, it's a 12 point, 19mm. This happens to be very, very close to 3/4", so you can use 1/2" threaded rod with standard nuts.

On the GK, it's a little bigger, more like 22mm. Which is close enough to 22mm. And as it turns out, you can get heavy-duty nuts with the same 1/2" thread inside that are 7/8" on the outside.

So my "fork stick" is a piece of 1/2" all-thread with regular 3/4" (19mm) nuts on one end and heavy-duty 7/8" (22mm) nuts on the other. The threads in the middle are covered with duct tape so as not to bung up the internal threads on fork tubes. I tack-welded the nuts in place.

Let me tell you, it impresses people no end when you haul out this goofy homemade contraption and stick it down into the unknown depths of their forks...
 
Nice job, congratulations. Below is a picture that might help others in preparation of fork rebuild. It shows all the parts of a 79' GS1000 as well as the "Special Tool" I made with the help from this site:

 
I think im learning as much after the fact as when I actually did the work....
I didnt search the site, but since ive joined I haven't seen many threads on the subject, and I cant recall any, so I figured I'd share my experience. Im glad I did.
 
Welllll...... I noticed the other day oil on one fork.....
I feared the worst thinking that the ding I put in the fork tube was the cause. I put it in the back of my mind while I worked on the house, then took a look this evening. I raised the dust seal to check the snap ring, etc. All in place. I wiped the oil off, then rocked the front up and down. There was a consistent oil ring around the whole circumference of the fork. If it was from a ding in the tube, I expected to see a vertical line....

I popped the other dust seal and noticed that the seal lip was flush with the retaining washer... The leaker was not.

I pulled it back apart and confirmed that there does seem to be an up and down judging by the shape of the seal lips. I took a guess based on this observation and that the other doesn't leak, and flipped the seal, reassambled, filled the forks, then rocked the front end like crazy...... DRY! No seal orientation was noted in the factory or Haynes manual..... Another lesson from the school of hard knocks. ... at least this go went a heck of a lot faster....
 
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The tool is a threaded rod with 2 nuts and lock washer,used to remove the fork retainer nut that is holding the springs in place.
I forget what the size is for the rod but the rod size determines the Nut size of the threaded rod on both ends the rod needs to be thread the nuts flush and tighten the two nuts against the lock washer (both ends the rod is about 36" long r longer

insert the threaded rod into the fork tube and just like a wrench it fits into the fork retainer

as you need to apply a fair amount of toque to remove the Fork Spring retainer.
You have to use a downward force and beware there is still tension on the springs let off slowly or you will be in for a surprise
 
In my case I locked a pair of vice grips on the top, then turned the allen bolt in the bottom of the forks until the vice grips stopped on something solid (my bike isn't that nice, so no worries) then the bolt broke loose.
 
Ok, nevermind. I just found another thread where Steve posted a picture of his "tool". I also like the idea of a sparkplug socket and extensions. I have those, and a very long extension, about 18", plus three or four other 4" extensions. I'll try that.

Incidentally, I tried breaking those bolts loose with an impact wrench while the forks where still clamped in the triple tree. I used the fork brace to keep the bottom fork housings from turning. No go. Is there some reason why that would not work?
 
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