Replacing rear control arm bushings

Moderator: Moderators

Replacing rear control arm bushings

Postby pcguy » Sun Oct 13, 2013 11:34 am

Sorry if this is a dupe, but after reviewing some 20 or so threads, nothing showed up???

Have removed the 4 rear control arms on my 75 and have ordered this set of bushings from Summit:
Image

A couple of questions:
Summit say the outer sleeves on the upper control arms need to be reused. Is that your experience?

What's the best method of lubricating the old/new bushings to help with the removal and install?

And, what kind of reinforcing is necessary to prevent warping when putting the arms on a press?

Also found this pic in another thread and this is what I'm dealing with. BTW, what purpose do the weights serve?
Image
2009 Corvette ZR1 - bone stock
1975 Vega Hatch - Built 350/TH350/3000 Stall - 400ish HP
User avatar
pcguy
 
Posts: 87
Joined: Thu Aug 09, 2012 12:08 pm


Re: Replacing rear control arm bushings

Postby cjbiagi » Sun Oct 13, 2013 12:26 pm

With many poly bushings you need to reuse the shell, one way is to torch them out by burning the rubber. I have also had luck just drilling through the rubber so that you can push it out.
Clyde.........75 Monza 2+2
User avatar
cjbiagi
 
Posts: 8033
Joined: Sun Jun 25, 2006 2:37 pm
Location: Glenwood, Illinois

1975 Chevrolet Monza

Re: Replacing rear control arm bushings

Postby waybad » Sun Oct 13, 2013 1:30 pm

do you have a part number for those bushings?
Tinker
User avatar
waybad
 
Posts: 1752
Joined: Sun Feb 24, 2008 12:03 am

Re: Replacing rear control arm bushings

Postby pcguy » Sun Oct 13, 2013 1:46 pm

2009 Corvette ZR1 - bone stock
1975 Vega Hatch - Built 350/TH350/3000 Stall - 400ish HP
User avatar
pcguy
 
Posts: 87
Joined: Thu Aug 09, 2012 12:08 pm

Re: Replacing rear control arm bushings

Postby cjbiagi » Sun Oct 13, 2013 3:45 pm

Be aware that with poly bushings in all the control arms their can be some binding because of the different swing lengths. Poly has very little "give" and can also be difficult to install if all the bolt holes are not lined up perfectly. Rubber ones can be a bit more forgiving in both respects.
Clyde.........75 Monza 2+2
User avatar
cjbiagi
 
Posts: 8033
Joined: Sun Jun 25, 2006 2:37 pm
Location: Glenwood, Illinois

1975 Chevrolet Monza

Re: Replacing rear control arm bushings

Postby pcguy » Sun Oct 13, 2013 3:54 pm

Hi Clyde, thanks for that. One question though, wouldn't the binding be a product of the length of the metal arms and therefore resulting from bad engineering? Of course, if the lengths are off from the factory/engineer, it sure could cause binding.
2009 Corvette ZR1 - bone stock
1975 Vega Hatch - Built 350/TH350/3000 Stall - 400ish HP
User avatar
pcguy
 
Posts: 87
Joined: Thu Aug 09, 2012 12:08 pm

Re: Replacing rear control arm bushings

Postby pcguy » Sun Oct 13, 2013 5:38 pm

Ok, here's how I was able to get them off, well at least the first two of eight. Mount the arm horizontally in a sturdy vice with the ferrules horizontal. Heat the outside sleeve with a propane torch evenly all the way around. After the rubber has had a chance to start smokeing for about 3-4 minutes and with a long bolt through the ferrule, pull hard by hand. Might help to have some sort of handle on the threads - I was able to pull on just the nut. At first it only moved a little, but a bit more heat did the trick. The rubber doesn't melt, it just releases the bond.

Now all I need to do is get the new ones in there - probably some silicone grease and a vice.
2009 Corvette ZR1 - bone stock
1975 Vega Hatch - Built 350/TH350/3000 Stall - 400ish HP
User avatar
pcguy
 
Posts: 87
Joined: Thu Aug 09, 2012 12:08 pm

Re: Replacing rear control arm bushings

Postby Wizeguyrc » Sun Oct 13, 2013 7:18 pm

I cut a piece of two inch angle to place between the control arms when installing the new bushings. This prevents the arm from bending when pressing them out and back in.
My original upper and lowers pressed out with no heat.
The wise man is the one who knows he is unwise.
User avatar
Wizeguyrc
 
Posts: 1012
Joined: Fri Feb 25, 2011 10:36 pm

Re: Replacing rear control arm bushings

Postby chevyart » Sun Oct 13, 2013 7:40 pm

hey tracy im about to do my front upper and lower control arms with new bushings and i also was worried about crushing the arms when installing the new bushings, would a round piece of pipe be ok to use up front(if there is room on the arm) so they wont crush or push in when installing the new bushinga, or is there another trick to do this. thanks art
chevyart
 
Posts: 1849
Joined: Fri Oct 27, 2006 10:00 pm

Re: Replacing rear control arm bushings

Postby chevyart » Sun Oct 13, 2013 7:43 pm

hey pc guy i think those weights on the rear upper arms are an anti- vibration(anti chatter) suppressor. i have a set hanging on my wall and i had asked about that n and that is the answer i received. art
chevyart
 
Posts: 1849
Joined: Fri Oct 27, 2006 10:00 pm

Re: Replacing rear control arm bushings

Postby pcguy » Sun Oct 13, 2013 7:49 pm

Thanks Art, kind of figured that - has anyone run without them? Nick
2009 Corvette ZR1 - bone stock
1975 Vega Hatch - Built 350/TH350/3000 Stall - 400ish HP
User avatar
pcguy
 
Posts: 87
Joined: Thu Aug 09, 2012 12:08 pm

Re: Replacing rear control arm bushings

Postby cjbiagi » Sun Oct 13, 2013 7:51 pm

With rubber bushings the binding isn't much of a concern as the rubber just compresses, it's more apparent with poly or solid bushings that don't give like rubber does. The upper arms are very short because there just isn't enough room to make them longer.
Clyde.........75 Monza 2+2
User avatar
cjbiagi
 
Posts: 8033
Joined: Sun Jun 25, 2006 2:37 pm
Location: Glenwood, Illinois

1975 Chevrolet Monza

Re: Replacing rear control arm bushings

Postby Wizeguyrc » Sun Oct 13, 2013 10:23 pm

chevyart wrote:hey tracy im about to do my front upper and lower control arms with new bushings and i also was worried about crushing the arms when installing the new bushings, would a round piece of pipe be ok to use up front(if there is room on the arm) so they wont crush or push in when installing the new bushinga, or is there another trick to do this. thanks art



Yes, something like that will work. I cut a piece of angle the proper length for the front arms as well. Be sure to use the short piece between ears on the lower control arm as well.
The wise man is the one who knows he is unwise.
User avatar
Wizeguyrc
 
Posts: 1012
Joined: Fri Feb 25, 2011 10:36 pm

Re: Replacing rear control arm bushings

Postby chevyart » Mon Oct 14, 2013 8:52 am

thanks tracy. will do as you suggested. ps i also read one time that if you freeze the bushings and put them in while froze, they slide in real easy. any truth to that? art
chevyart
 
Posts: 1849
Joined: Fri Oct 27, 2006 10:00 pm

Re: Replacing rear control arm bushings

Postby cjbiagi » Mon Oct 14, 2013 10:49 am

I simply use a piece of PVC pipe, cut a slot into it so it fits around the bushing and is the same width as the space on the control arm. It's simple and cheap and is strong enough to prevent the channel from collapsing.
Clyde.........75 Monza 2+2
User avatar
cjbiagi
 
Posts: 8033
Joined: Sun Jun 25, 2006 2:37 pm
Location: Glenwood, Illinois

1975 Chevrolet Monza

Next

Return to Suspension, Steering, & Brakes Tech

Who is online

Users browsing this forum: No registered users and 1 guest