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mr. c Samba Member
Joined: November 14, 2007 Posts: 153 Location: Black Hills, SD
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Posted: Tue Aug 20, 2013 5:50 am Post subject: new front springs, shocks, & bushings, and now a knock?? |
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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? _________________ Abe: 1987 Syncro Full Camper, TiiCo engine conversion, A3 pulley kit |
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MarkWard Samba Member
Joined: February 09, 2005 Posts: 17155 Location: Retired South Florida
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Posted: Tue Aug 20, 2013 7:32 am Post subject: |
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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 Samba Member
Joined: November 14, 2007 Posts: 153 Location: Black Hills, SD
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Posted: Tue Aug 20, 2013 10:20 am Post subject: |
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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. _________________ Abe: 1987 Syncro Full Camper, TiiCo engine conversion, A3 pulley kit |
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j_dirge Samba Member
Joined: August 08, 2007 Posts: 4641 Location: Twain Harte, CA
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Posted: Tue Aug 20, 2013 10:25 am Post subject: |
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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? _________________ -89 GL Westy, SVX.. finally.
-57 pan f/g buggy with a 67 pancake Type 3 "S"
"Jimi Hendrix owned one. Richard Nixon did not"
-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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hankster2 Samba Member
Joined: March 25, 2010 Posts: 60 Location: Sammamish, WA
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Posted: Tue Aug 20, 2013 1:29 pm Post subject: |
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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. _________________ 1987 Syncro Westy w/Bostig |
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mr. c Samba Member
Joined: November 14, 2007 Posts: 153 Location: Black Hills, SD
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Posted: Tue Aug 20, 2013 7:23 pm Post subject: |
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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.) _________________ Abe: 1987 Syncro Full Camper, TiiCo engine conversion, A3 pulley kit |
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adv rider Samba Member
Joined: September 09, 2012 Posts: 288 Location: Everett,wa
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Posted: Tue Aug 20, 2013 11:24 pm Post subject: knock |
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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. _________________ 86' Wolfsburg weekender 2.1, 4spd, , merian brown |
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MarkWard Samba Member
Joined: February 09, 2005 Posts: 17155 Location: Retired South Florida
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Posted: Wed Aug 21, 2013 6:56 am Post subject: |
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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 Banned
Joined: March 07, 2002 Posts: 15086 Location: New York
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Posted: Wed Aug 21, 2013 7:03 am Post subject: |
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Knock, knock....
I would take the van to a suspension specialist instead of all the guesswork and assumptions. |
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Steelhead Samba Member
Joined: February 25, 2007 Posts: 1791 Location: Kentfield, CA
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Posted: Wed Aug 21, 2013 9:25 am Post subject: Re: knock |
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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. _________________ '77 Bay Window / '89 Caratsburg (aka. the Stormtrooper) |
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j_dirge Samba Member
Joined: August 08, 2007 Posts: 4641 Location: Twain Harte, CA
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Posted: Wed Aug 21, 2013 10:02 am Post subject: |
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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). _________________ -89 GL Westy, SVX.. finally.
-57 pan f/g buggy with a 67 pancake Type 3 "S"
"Jimi Hendrix owned one. Richard Nixon did not"
-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 Samba Member
Joined: November 14, 2007 Posts: 153 Location: Black Hills, SD
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Posted: Fri Aug 23, 2013 5:56 am Post subject: Re: knock |
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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 ) 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. _________________ Abe: 1987 Syncro Full Camper, TiiCo engine conversion, A3 pulley kit |
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insyncro Banned
Joined: March 07, 2002 Posts: 15086 Location: New York
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Posted: Fri Aug 23, 2013 10:01 am Post subject: |
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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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