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Old 01-05-2018, 11:15 AM   #1
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Broken upper shock mounting stud, drivers side rear drive axle

Found a broken upper shock mounting stud. This is on the drivers side, rear drive axle, front shock mount.
Looks like it sheared or someone got over zealous with an impact.
I'd like to avoid welding in this area so I'm thinking of drilling a hole in the mounting plate and using a grade 8 bolt with hardened flat washers to reattach it. The mounting plate appears to be 3/8" think with a washer or bushing still welded to it. I would have to drill through a little over 1/2" of steel.

I've seen these before. How did you guys deal with it?
Also, what diameter are the mounting bolts?
Thanks
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Old 01-05-2018, 02:22 PM   #2
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Drilling it out and using a bolt would be my choice. I think it will drill out pretty easily if you start with a small, sharp bit and then increase sizes gradually.

If you Googkle "Shock Mounting Stud" you can find some that are designed for this purpose - such as this (link is just an example not knowing what size you need): https://www.quadratec.com/products/1...0aAofsEALw_wcB

If you use a bolt, it may be more desirable to add a piece of angle iron on the opposite side, so the shock is in between two metal support plates. Of course this would mean you would need to drill a couple of holes in the frame to attach the angle iron support to the frame. I can't tell if this is easy to access or not.
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Old 01-05-2018, 06:58 PM   #3
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I spent about 20 min on this today. I started with a US made 1/8" cobalt drill bit and a spray bottle of cutting oil.
I then stopped and removed the shock just to get it out of the way.
With the air suspension raised all the way I can sit up inside there and just reach it with a right angle drill. It's tough to get 2 hands in there to apply any pressure to the bit. I tried putting a small 2x4 behind the drill and then could leverage some pressure against the bit. I got about 1/4" deep into the plate (actually into the piece welded to the plate) and shattered the bit.
I ran out of time and will have to reattack it another day.

I measured the bottom bolt and the OD is .557". I'm guessing it's a 14mm metric bolt?
Does anyone know if the upper bolt is the same size?
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Old 01-05-2018, 08:38 PM   #4
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Quote:
Originally Posted by vito.a View Post
...
I measured the bottom bolt and the OD is .557". I'm guessing it's a 14mm metric bolt?
Does anyone know if the upper bolt is the same size?
9/16" is 0.5625", and I suspect they (top and bottom) are the same size. Maybe measure one of the other shocks?
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Old 01-06-2018, 08:43 AM   #5
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Must have Bilsteins . They are too stiff. I went to Josams and had konis put on. Pricey but a much better ride. Used to feel every expansion joint. Josams broke two studs trying to get all of them off. They drilled our and used bolts.
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Old 01-06-2018, 08:52 AM   #6
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If you use a bolt, you need to have it "fully threaded" so you can run a nut up against the support bracket. As you know when you install the shock over the bolt you can't run the retaining nut up too tight. The shock needs to be able to move some (in its rubber bushing).

So if you don't have the inner nut tight up against the support bracket, and you leave the outer retaining nut loose (as necessary), the bolt will rock back and forth and wear out the support bracket hole (that's why I recommended the additional support bracket if you go with a bolt (and you are not using the inner nut)).

You will see with the replacement "Stud" option (see the picture in my link) there is an inner nut to tighten the stud against the support bracket. Then a smooth shaft for the shock to mount on, and the outer retaining nut.

This is a lot of typing for something that i'm sure is obvious to you - but I rather you be safe than sorry.
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Old 01-07-2018, 05:16 PM   #7
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Vito.a, I'm curious if the straps that keep the suspension from extending too far are intact?

Mine are in need of replacement and the thought of snapping a shock bolt could be the cure for procrastination on my part.
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Old 01-08-2018, 04:09 PM   #8
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I had the same thought.
Where are the limiter straps located?
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Old 01-09-2018, 07:50 AM   #9
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Old 01-14-2018, 12:21 PM   #10
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Are the light blue shocks OEM Monroes?
I have yellow shocks (Bilstein?) on the front and blue ones on the rear.
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Old 01-14-2018, 11:41 PM   #11
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I dunno, mine are medium blue Bilstein Electric " Adjustible Shock System" shocks with a wire running to each.
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Old 01-27-2018, 06:07 PM   #12
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I was under the front of my coach yesterday and noticed the Limiting Straps are there in the front on each side.

I looked under the back of an '06 Signature and several other tag axle coaches at the Monacoers Rally in Quartzsite, none had those straps. So far mine is the only one with them I have heard of.
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Old 01-28-2018, 04:06 PM   #13
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I suspect the shocks are acting as limiters on my coach.
I began drilling a hole in the mount plate but the bit shattered. I need to grind out the small piece of drill bit remaining.
I ordered some cobalt drill bits and 2 new Bilstein shocks.
I'll reattack it again next week.
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Old 01-28-2018, 04:19 PM   #14
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Quote:
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Are the light blue shocks OEM Monroes?
I have yellow shocks (Bilstein?) on the front and blue ones on the rear.
All yellow are usually Monroe shocks. Yellow body with blue shields, Bilstein.
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