Upper shock mount

[Larry D]

Hi Everyone. I knew the mount was broken on the GK, but, I'm now ready to repair it. I've done the search thing and found a bit of info. If anyone has some good links to this repair, I'd like to see them. There is not enough bolt left to recut the threads, it broke off pretty short.

Is it really as simple as drilling out the broken one and slapping in a new grade 8 bolt ? I was thinking a sleeve welded into the drilled hole and then a new bolt through the sleeve.....sound reasonable ?

Is welding absolutely required ? Would just a bolt be enough ?

 

[Nessism]

Replicating the OE stud would be easy for someone with a lathe. Do you know anyone that could make one for you? If not, there are a couple of people around here that might be able to help you out.

The other way to go is to drill into the OE stud and thread the ID for a screw. I think that would work but the stud will be weakened - not sure if that would matter. Personally, I'd work to replicate the OE stud since that way is proven.

 

[Larry D]

Yes, our shop at work has a lathe. I'm sure they could whip one up for me, if I could give them an example of what is required. I could measure up the OD of the mount along with the camfer and the required length, thread length, pitch, etc........

Sorry I haven't examined the mount closely yet. I will tonight and take some pics........ From what I understand, these mounts are actually a stud which is chamfered and threaded on the end. This stud is then welded into a cavity in the frame.

Would it NOT be a good idea to simply drill this whole mess out and replace it with a nice high tensile strength bolt ? Perhaps welded in place with a sleeve for support ?

 

[Nessism]

Yes, our shop at work has a lathe. I'm sure they could whip one up for me, if I could give them an example of what is required. I could measure up the OD of the mount along with the camfer and the required length, thread length, pitch, etc........

Sorry I haven't examined the mount closely yet. I will tonight and take some pics........ From what I understand, these mounts are actually a stud which is chamfered and threaded on the end. This stud is then welded into a cavity in the frame.

Would it NOT be a good idea to simply drill this whole mess out and replace it with a nice high tensile strength bolt ? Perhaps welded in place with a sleeve for support ?

I'd drill out the OE stud and replace it with a similar part. You might want to check out McMaster-Carr for a threaded shoulder bolt - that would make a good replacement assuming the diameter is appropriate. I don't like the idea of using a bolt in place of the original stud, even if you used a sleeve to supplement. By the time you worked out details on a tight fitting sleeve you could have just whittled out a complete stud with threaded end.

http://www.mcmaster.com/#shoulder-screws/=6679v8

.

 

[Larry D]

Thanks Ed. Seems I have some investigating and measuring to do......

 

[Larry D]

After a visit from bwringer last night, we've concluded that the shock mount is going to be sufficient to hold the shock. There's going to be some modification required, but, it's doable.:clap:

Sadly, we also discovered that my front master cylinder needs rebuilt. I have installed new SS brake lines and rebuilt calipers. I just could not get them to bleed properly. With Brian's help we "bench bled" the master, to no avail. The master and switch is toast, so.....more new parts !!!!

I did get new o-rings and gaskets in the tach cable drive, cam chain tensioner and oil pressure switch. So, the night wasn't totally without merit. Just gotta keep moving forward.

 

[Nessism]

Before ordering a master kit you might want to remove the old plunger and look down the bore with a flashlight to make sure there are no pits in the metal (which unfortunately is quite common).

 

[Larry D]

Here's a few pics of the shock mount. As you can see, there's enough meat there to support the shock...and after further review, I think the "joining nut" method will be fine to hold the shock laterally. I'm going to clean up the threads with a die, get a wider "joining nut" and call it good.

 

[cdnoel]

I have bolts.

I have bolts.

I have bolts that I used on my GS850 to replace the left shock stud. I got them from McMasterCarr.com and I still have two. They are shoulder bolts that once the old bolt is ground off and a hole is drilled through the frame they will work. I can't remember what size drill bit I used but it was and odd size to ensure the fit was tight. I had to order a chrome cap nut as well as the thread of the bolt was different. If you are interested in the exact size bolt and drill bit I used send me a PM and I'll get it for you.

 

[SqDancerLynn1]

I ran into something like that. 83gs1100G Had some type of bolt extensions for accessories. Had different thread pitch on each end.