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new front springs, shocks, & bushings, and now a knock??
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mr. c
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PostPosted: Tue Aug 20, 2013 5:50 am    Post subject: new front springs, shocks, & bushings, and now a knock?? Reply with quote

Over the course of the last month I've installed Old Man Emu's, Schwenk D/P springs, and replaced most of the front bushings with Powerflex yellow. Now I have a knock from the front right wheel when I turn right at a moderate speed (20-30 mph). It only happens when I turn right at a moderate speed.

In the process of the parts swap I punctured the CV boot and lost a small amount of grease but I sealed it with some RTV and it has held. Is it possible that in the process of the swap I wrenched/leaned so hard on the front axle that I damaged the CV? What else should I be looking at?
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MarkWard
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PostPosted: Tue Aug 20, 2013 7:32 am    Post subject: Reply with quote

Probably coincidence. If you had the suspension drooped to make the changes I suppose you could have damaged the CV joint, but it is unlikely the tear caused the problem. That said, why would you not have changed the boot and repacked the joint when you poked a hole in it? You were almost all the way there when you had the suspension apart. The boot won't last unless you found some miracle rubber bonding glue.
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mr. c
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PostPosted: Tue Aug 20, 2013 10:20 am    Post subject: Reply with quote

rsxsr wrote:
Probably coincidence. If you had the suspension drooped to make the changes I suppose you could have damaged the CV joint, but it is unlikely the tear caused the problem. That said, why would you not have changed the boot and repacked the joint when you poked a hole in it? You were almost all the way there when you had the suspension apart. The boot won't last unless you found some miracle rubber bonding glue.


While standing over me and holding lil' C, the last thing Mrs. C wanted to hear at that point was "uh...one more thing."

Can the noise be anything other than the CV? I've been trying to visualize the turning inputs and understand why it would only occur when turning to the right.
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j_dirge
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PostPosted: Tue Aug 20, 2013 10:25 am    Post subject: Reply with quote

mr. c wrote:

Can the noise be anything other than the CV? I've been trying to visualize the turning inputs and understand why it would only occur when turning to the right.

A loose wheel bearing can emit a resonance that transfers to other things.. like the shocks.


Have you rechecked all the hardware to see that it has seated fully and is still adjusted?

I'd get under and keep looking.. tapping with a hammer.
First thing I'd check are the shock mounts.

Then I'd look at the brake pads.. maybe not seated or reinstalled quite right?
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danfromsyr wrote:
those are straight line runs with light weight race cars for only 1/4mile at a time..
not pushing a loaded brick up a mountain pass with a family of 4+ inside expecting to have an event free vacation..
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hankster2
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PostPosted: Tue Aug 20, 2013 1:29 pm    Post subject: Reply with quote

When you say "knock" do you mean multiple noises or just one knock?

Reason I ask: I had a similar situation that emitted a single knock when I turned. Turns out one of my sway bar end links had corroded inside the bushing and when I the van leaned the link was actually hitting the lower control arm.

Another idea to give you an extra set of eyes: If you've exhausted your look at the suspension and can't find anything, could you have loosened/moved the front diff while working on the suspension? It could be moving around or if shifts out of alignment it can cause a vibration similar to a CV issue.
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mr. c
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PostPosted: Tue Aug 20, 2013 7:23 pm    Post subject: Reply with quote

hankster2 wrote:
When you say "knock" do you mean multiple noises or just one knock?


It's multiple knocks at what I would call a medium frequency for a vehicle. Probably about...240 bpm @ 20ish mph.

All the screws and bolts I torqued to spec, but I'll inspect all the hardware again. I'll check out the diff too. I'm going to get a buddy to hang his head out the window to get a more accurate location of the knocking. (And collect some data on keeping your dog cool.)
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adv rider
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PostPosted: Tue Aug 20, 2013 11:24 pm    Post subject: knock Reply with quote

I am wondering how much of a difference in height there is between your new and old springs/suspension.

My thoughts are the cv axle wore in the previous angle, and now sits at a different angle with the new suspension. Causing the knock you hear.

Not sure if this is possible, but seems like something to look into. If everything else checks out.
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PostPosted: Wed Aug 21, 2013 6:56 am    Post subject: Reply with quote

Try lightly tapping the brakes when it is making the noise to see if the noise goes away. This will eliminate the pads as the problem. I like the suggestion that the CV's are riding in a new position. CV's tend to wear in one area of the ball ramp.

CV maintenance is part of owning an IRS suspension. 4 CVs are plenty to keep up with. The Syncro is a CV galla. I would think CV's should be cleaned, inspected and repacked every 60K miles. 30k would be better.
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insyncro
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PostPosted: Wed Aug 21, 2013 7:03 am    Post subject: Reply with quote

Knock, knock....
I would take the van to a suspension specialist instead of all the guesswork and assumptions.
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Steelhead
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PostPosted: Wed Aug 21, 2013 9:25 am    Post subject: Re: knock Reply with quote

adv rider wrote:
My thoughts are the cv axle wore in the previous angle, and now sits at a different angle with the new suspension. Causing the knock you hear.

This happened to me when I lifted. Old CVs, new angle, new knock.
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j_dirge
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PostPosted: Wed Aug 21, 2013 10:02 am    Post subject: Reply with quote

Like Steelhead. 2WD.
Lifted one inch.. and both CVs were knocking within 3000 miles.
One failed at 8K.
They were due anyway..180k originals.. likely not serviced as often as they should have been.

Replaced and no knocks.

Maybe OP syncro's fronts have just been pushed enough to cry for maintenance (or replacement).
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-Grand Tour, Season 1, episodes 4 and 5

danfromsyr wrote:
those are straight line runs with light weight race cars for only 1/4mile at a time..
not pushing a loaded brick up a mountain pass with a family of 4+ inside expecting to have an event free vacation..
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mr. c
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PostPosted: Fri Aug 23, 2013 5:56 am    Post subject: Re: knock Reply with quote

Steelhead wrote:
adv rider wrote:
My thoughts are the cv axle wore in the previous angle, and now sits at a different angle with the new suspension. Causing the knock you hear.

This happened to me when I lifted. Old CVs, new angle, new knock.


I believe this is the case. I needed the front left replaced last summer (due to, I'll admit it, driving with loose lug nuts for about 80 miles Rolling Eyes ) And there is no issue with that side now.


insyncro wrote:
Knock, knock....
I would take the van to a suspension specialist instead of all the guesswork and assumptions.


Now that is just silly.
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insyncro
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PostPosted: Fri Aug 23, 2013 10:01 am    Post subject: Reply with quote

Silly is as silly does.

Schwenk springs minimally lift vs GW springs, that max the amount in the +2 version and have been shown to also lift in the zero version.

A grease needle will allow for packing of the joints without removing the boots.
Worth a shot as the cost of a proper brand new outer front CV is high.
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