Topic: Shock mounts

[The Gurg]

Lower shock mounts on the swingarm of cb750k5. Using a stud, bolts and washers and a 15mm socket to press the new shock mounts into place. Having difficulty getting the mounts to line up. Lubricated the swingarm holes and have the mounts cooling in the freezer. Any other tips?

[754]

I would not bother freezing anything.
 Lube the metal part before pushing in, good job for a press.

[The Gurg]

Thanks 754! Wish I had a press. I think the stud and socket might exert enough pressure to force it in, just a little hesitant to crank down on it. Got it started and backed it out. Can see a little scuffing on the outside of the mount. Seems like the scuffing is from not sitting flush.

1.) crank down on it and don’t worry
2.) keep trying until it lines up and go slow
3.) take it to a machine shop with a press
4.) buy a press and hide the credit card statement from my wife

[754]

Ok try to get a good fit on the bushings that support the hole and push the parts.
Lube the rubber mount and the bore with grease.. if it goes in to easy we can deal with it IF and when.
 Sort a looks like it was not lubed nearly enough.
 Use a biggest fine pitch bolt  that fits.. I am guessing 3/8 "

[The Gurg]

I lubed both the bore and mount liberally. I agree though that it doesn’t appear that way from the scuffing.

[Alan F.]

I'm not sure if it's been mentioned and I missed it, but I thought those bushings were tapered and only fit one way, and can only go in from one direction. I thought they go in from the center of the swingarm.

[The Gurg]

I read that on a thread the other day (May have been Alan F.’s comment on another thread) so I measured the bushings and bore hole. Not seeing a taper on the bushing for sure. If I remember right it was 22.04mm on either side of the bushing. Hard to get a consistent reading with the micrometer on the bore. But not noticing a taper there either. I’m tapping in the bushing from the inside of the swingarm towards the outside just in case. Thought I saw somewhere that’s supposed to be the direction of the taper, which is what Alan F. is saying. I’ll take some time to remeasure tomorrow.

[The Gurg]

Bushing/mount has four dots in the rubber on one side and smooth on the other.

[low-side]

I did this recently on my Wings (same part number).  I used a bearing and seal driver with a bushing in the bore as well as one that caught the OD.  This kept it straight while I drove it in with a 2# hammer with no issues.  I didn't use any lube, I just made sure that the bore was clean and the bushing was straight.  I hope that's helpful.

[PeWe]

I used a vise and sockets as others have done in other threads. My vise got its shaft bent.

Extra leverage with an old CB750 fork pipe
For out with old as well as in with the new.

[754]

Umm that is not a vise you wantvto put extra leverage on.
 If it were a go if steel vise, you could tap the back of jaw for some impact help..
 Again... this is not the vise for that type of use. ..  don't ask me how I know that the whole jaw can break off ..

I will draw  up an easy home build able press for this that you can strike. You will need a drill press and saw..

[754]

  Here is the Rubber Bushing Press.. by 754.
 Feel free to ask questions.,

[The Gurg]

Photo of those promised measurements, still not seeing a significant taper in the numbers.

[The Gurg]

So.........
Noticing that my measurements for the mount are larger than the bore hole...

Got the part from partzilla. Part number 40458-268-000.

Did they send me the wrong part/have the wrong part listed on the parts diagram? See measurements in last photo on my last post.

[754]

It looks like about 4 to 6 thou interference.  Lets say 4 thou.  It's not solid it has give because it's a sleeve.
 Lube them up with grease , keep em as straight as you can to get then started.

 If you have a bench to clamp 2x4 to , put the inside of swingarm on the wood, other side below bench. A helper to hold swingarn . A solid bar or tube  to drive it in... relieve end for inner sleeve if you use solid.. lube them, start carefully , and using a hammer just drive them in.. start off slow..

[The Gurg]

Pictured is what I picked up from the hardware store today. Should this work? Bolt is a M10x1.5 fits almost perfectly in the ID of the mount.

Lowe’s didn’t have a fully threaded M10. So I bought a box of washers lol.

[754]

Pretty much same as 3/8 - 16   fine thread will pull easier ..like 3/8 -24.. more mechanical advantage.  Grease the threads., and tapping bolt nunder tension may help..a sharp rap..

[The Gurg]

Oh that’s right you’re where I got the idea from. I tried 3/8, that was a great guess. M10x1.5 fits a little bit closer.

[flatlander]

yes that'll work.
here's how i did mine, pretty much same idea. they went it fine.

[The Gurg]

Yep, working for me. Got the first mount to go in 75% of the way. Had the nut heat up from tension, even though I oiled the threads per 754’s instructions. Thought maybe it wouldn’t work out and went to my mechanic who was willing to let me use his press. The swingarm wouldn’t fit in the press, maybe a smaller presses would work? Couldn’t get just one arm of the swingarm in because the lower plate of the press blocked the arm if that makes sense. Brought it back home and gave it a second attempt, swapped out the nut and was making some headway, went in another 10%. Needed some slightly smaller washers next to the mount. The large washer started making contact with the swingarm and couldn’t go in further. So I picked those up some washers at home depot and quit for the day.

So my question, is how flush should these sit? Haven’t measured yet, but looks like the mount is slightly thinner than the swingarm bore. Should it sit flush on one side or the other? Or centered? Easiest to make it flush on the inside of the arm.

[754]

When you get the bolt tensioned up , give it a sharp rap with the hammer.
 When you stop is when it might seize.....Fine threads probably would have got it in all the way.
 That's why you use grease on nut, threads, the bushings and bores , oil is too light.

[The Gurg]

Oh oops, meant to get fine threads. Used oil too. Bet those would have both helped a lot! Got a second mount to try those out on!

Does the mount sit flush to one side or the other or centered?

[754]

Can't remember if they are centered , someone will come along that knows.

[flatlander]

i also don't remember. but basically, make sure it goes in parallel to the bore. if you notice it's at an angle, back off, adjust and start new.
to be honest i don't remember this being rocket science. it needs a good squeeze to go in and parts of your home-made press my die in the process, but otherwise it's not that complicated. have some spare parts available for the press/mount thing, and crank away.

[BenelliSEI]

....... check out a press. Even a small, table top unit will do this job in seconds. Once you have one, it’s surprising how often you’ll use it, instead of a BFH!. Bonus is your other tools will stop getting damaged.

[The Gurg]

Got them mostly in, but they aren’t sitting flush and they don’t want to go in more. Really cranked down on them. Got the breaker bar out and really tightened down.

What do you guys think of how far the mounts are in, are they flush enough?

Everyone telling me to get a press is right. Spent $20 on hardware to make this work, $20 could have gone towards that press and it would have been simple and easy.

[754]

Put a straight edge across it , if it does not touch hole in the swingarm, then nothing will rub. That is why the center is longer. . Like they should be centered. , but main part shock mount clears the swingarm.

[The Gurg]

Mounts are in centered and flush. They do sit flush on both sides, obvious now that their in. Straight edge doesn’t make contact with the swingarm when held against the mount.

Thanks so much everyone, especially 754,  for your help and advice on this thread!