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 Write-Up: Subframe/Cradle Mount Insulators & Bushings

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DeepFrozen
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Name : Dmitry
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PostSubject: Re: Write-Up: Subframe/Cradle Mount Insulators & Bushings   Tue Aug 15, 2017 8:11 am

I replaced my dead body mounts with Dorman P/N 924-044's. As was said here - just loosened front bolts and then I had enough cradle movement to be able to replace rear mounts.
But I encountered an unexpected problem. I guess those bushings are meant to be squished pretty hard to ensure tight & correct subframe position. Not my case. I was tightening bolts and when those "mushroom" washers (upper and lower) met and rested against each other,  upper bushing was hardly compressed at all, I'm able to move it by hand.
Now it is like this:


It can't be right. Has anyone experienced anything like that?
The reason I'm having this clusterf##k could be the fact that my Riviera is '97 and subframe was taken off an '95 Aurora. But is it?...
(now) I'm not 100% sure, but I believe they share the same cradle.


Well, after some (brief) head-scratching I think I'll put additional modified washer between the lower washer and bushing and tight the whole thing back. I'm gonna take old washers and cut those "caps" off 'em to get something like this:



It will give me about 3/4" of additional "squishing gap" which, I hope, will be enough.
Rusty and ugly, but this should work.

... on the other hand - may be I'm just being stupid and overlooked something simple and managed to screw the whole thing up smile
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DeepFrozen
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PostSubject: Re: Write-Up: Subframe/Cradle Mount Insulators & Bushings   Tue Aug 22, 2017 4:20 am

Well, with additional washers I got tighter assembly and more confidence )  

To push my confidence even further, I put a camera in there and pointed it on the most rear body mount on the passenger side. Then I made some test runs back and forth with enthusiastic braking.  



At least, now I know the cradle is not wobbling around.
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h20man
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PostSubject: Re: Write-Up: Subframe/Cradle Mount Insulators & Bushings   Thu Aug 24, 2017 11:46 pm

I need to basically do exactly what you just did, I kept hearing a clunk when steering and hitting bumps to find out that my subframe bushing was about to come out. Now did you replace any of those captured bolts? I'm afraid that the new England weather here did a number on mine. Also does that Dorman pack replace the front and rear bushings
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DeepFrozen
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PostSubject: Re: Write-Up: Subframe/Cradle Mount Insulators & Bushings   Fri Aug 25, 2017 2:15 pm

Not sure what captured bolts you are talking about. In my case the subframe was replaced after an accident and all bolts came out relatively easy. But couple of lower washers were literally rusted through. So I bought those Dorman kits - and yes, same kit works for any position in the cradle - and replaced everything.
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h20man
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PostSubject: Re: Write-Up: Subframe/Cradle Mount Insulators & Bushings   Sun Oct 29, 2017 9:54 pm

Ok so I replaced the inner mounts (ones closest to the front of the car) with the Dorman bushings. And I still have a horrible clunk from the right side. I'm guessing I should have replaced all four at the same time maybe because the pressure of a new mount renders the older one useless?
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LARRY70GS
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PostSubject: Re: Write-Up: Subframe/Cradle Mount Insulators & Bushings   Mon Oct 30, 2017 12:41 pm

The front two are usually in great shape because they are protected by splash shields, but the rear 4 are the ones that get corroded and fail.

_________________
98 Riviera SC3800  All stock except gutted air box.
1970 Buick GS455 Stage1, TSP built 470BBB, 602HP/589TQ
Best MPH, 116.06 MPH, Best ET, 11.54
https://www.youtube.com/watch?v=UHCda-t_Jls
https://www.youtube.com/watch?v=sfT2tEO4XcU
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h20man
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PostSubject: Re: Write-Up: Subframe/Cradle Mount Insulators & Bushings   Tue Oct 31, 2017 11:32 am

Yeah those seem to be just fine it's the 4 that deep frozen replaced, I did the 2 closer to the front but not the rears... they seem to be clunking now
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JOE RIV 1
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PostSubject: Re: Write-Up: Subframe/Cradle Mount Insulators & Bushings   Mon Dec 04, 2017 4:03 pm

im going to fix my 96 but would like to know the size hole in the cradle where the bushings go. i need to do some welding thanks for some help. joe riv
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stydel311
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PostSubject: Re: Write-Up: Subframe/Cradle Mount Insulators & Bushings   Sat Dec 09, 2017 10:50 pm

My front two mounts on the rear of the cradle in my car are in kind of tough shape. One was missing the lower washer and rubber insulator, the other one I barely grabbed the lower washer and it, as well as the rubber insulator, came off in my hand lol. The upper parts of the insulators look pretty good, as do all of the other insulators and washers (rearmost and very front). I'm thinking I could just do the bottoms of the bad two. Is is possible to buy just the lower rubber, lower washer, and bolt for both mounts? Also what are the odds of the bolts snapping off? I'm guessing penetrating oil, time, heat, and patients would all be a good idea.
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h20man
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PostSubject: Re: Write-Up: Subframe/Cradle Mount Insulators & Bushings   Fri Nov 16, 2018 11:29 am

Ok so after installing the 4 mounts everything is now solid but for some reason I'm getting a popping sound when turning or hitting light bumps. Almost sounds like bad strut mount even though they were replaced last year. So what I did is i went and re tourqued the bolts for the 4 mounts and the noises stop for a couple days and come back. Why is this happening? It seems like they loosen up all the time on me
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LARRY70GS
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PostSubject: Re: Write-Up: Subframe/Cradle Mount Insulators & Bushings   Fri Nov 16, 2018 6:55 pm

Just make sure it isn't the sway bar mounts or end links. Give them a look. I just had to have new metal welded in on my cradle because one of the bolts on a bushing had torn through the metal. Made a clunking noise on turns.

_________________
98 Riviera SC3800  All stock except gutted air box.
1970 Buick GS455 Stage1, TSP built 470BBB, 602HP/589TQ
Best MPH, 116.06 MPH, Best ET, 11.54
https://www.youtube.com/watch?v=UHCda-t_Jls
https://www.youtube.com/watch?v=sfT2tEO4XcU
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h20man
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PostSubject: Re: Write-Up: Subframe/Cradle Mount Insulators & Bushings   Fri Nov 16, 2018 8:32 pm

I hope it's nothing like that, I'll double check everything is tight on both sides. It's so weird though only small bumps cause almost a small tapping noise, and light clunk/pop when turning.
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LARRY70GS
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PostSubject: Re: Write-Up: Subframe/Cradle Mount Insulators & Bushings   Sat Nov 17, 2018 8:47 am

That's exactly what a loose sway bar sounds like. Happened numerous times to me. Once, the end link had snapped, but it wasn't readily apparent. The bolt had snapped underneath the bushing, but the bushing stuck to the bar, so I couldn't tell until I looked closer. Had to cut/beat the old end link off. This last time was similar, I had to look closer. The nut for the bushing mount is part of the sub frame. It had broken free all around, but the other one on that same bushing was fine. Every so often, it would clunk on turns/bumps. The bushing was moving enough and I have the Addco bar, so it is solid. When I looked closer, the damage was apparent. Luckily, I know a really good fabricator/welder. He fabricated and welded in replacement metal and welded the nut to the bottom of it. Looks stock unless you look very closely.

_________________
98 Riviera SC3800  All stock except gutted air box.
1970 Buick GS455 Stage1, TSP built 470BBB, 602HP/589TQ
Best MPH, 116.06 MPH, Best ET, 11.54
https://www.youtube.com/watch?v=UHCda-t_Jls
https://www.youtube.com/watch?v=sfT2tEO4XcU
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h20man
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PostSubject: Re: Write-Up: Subframe/Cradle Mount Insulators & Bushings   Sat Nov 17, 2018 9:35 am

I'll have to take a look, sway bar definitely makes sense because everything suspension wise besides sway bar bushings was replaced about 2 years ago. The cradle mounts were done last year.
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Write-Up: Subframe/Cradle Mount Insulators & Bushings
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