those with pbm sphericals..
09-05-14, 07:43 PM
#1
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those with pbm sphericals..
Alright, so you guys are going to be my best shot at whether this is normal or not.
I have pretty much the entire pbm rear end, including the spherical s. I noticed my *** end was loose one day driving normal on my way home. I got it in the air and realized that my toe link was loose allowing the trailing arm to pivot where the spherical is and mounts to the sub-frame assembly.
I then took a small pry bar and could physically shift the trailing arm back and forth on that spherical... this does not seem normal. I would think once pressed into place, that it will not move around with just a small pry bar, let alone the cars weight.
Anyone ever seen anything like this?
I have pretty much the entire pbm rear end, including the spherical s. I noticed my *** end was loose one day driving normal on my way home. I got it in the air and realized that my toe link was loose allowing the trailing arm to pivot where the spherical is and mounts to the sub-frame assembly.
I then took a small pry bar and could physically shift the trailing arm back and forth on that spherical... this does not seem normal. I would think once pressed into place, that it will not move around with just a small pry bar, let alone the cars weight.
Anyone ever seen anything like this?
09-09-14, 07:12 AM
#5
No snap rings, there are no positive retention features beyond the initial press fits. The bearing is pressed into the 2 aluminum bushing halves, then that bushing assembly is pressed into the trailing arm. It took every thing my 20ton HF press had to get them installed in my trailing arms.
09-09-14, 08:39 AM
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yeah, this is what has been bothering me. They literally just "sit there" once installed. And if your toe link gets loose (Like mine did) I think the weight of the car lets them shift around. My *** end feels all sorts of loose at the moment. I have not been in for an alignment yet though after installing everything so I could be jumping the gun here.
Next week I am going in for full tuning alignment session to get the car dialed in where I like it and will report back.
edit: I have just over 140 miles on these if that makes a difference...
Next week I am going in for full tuning alignment session to get the car dialed in where I like it and will report back.
edit: I have just over 140 miles on these if that makes a difference...
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09-09-14, 04:03 PM
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the one side yes, but we were not using a press. The other side I brought to my mechanic and he was done in no time using his press. I do not recall however if this is the side we screwed up and ended up pressing out.
You may or may not recall when I realized that the 3 pieces must be pressed together before being pressed in? I hope I did not screw up the tolerance in the trailing arm now by "stretching it" per say from the multiple pressings.
This could just be a case of I messed it up and need another.... ugh
You may or may not recall when I realized that the 3 pieces must be pressed together before being pressed in? I hope I did not screw up the tolerance in the trailing arm now by "stretching it" per say from the multiple pressings.
This could just be a case of I messed it up and need another.... ugh
09-10-14, 05:28 PM
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Website states: We will be discontinuing direct sales on June 24th, 2013
Online ordering will no longer be available after June 24th, however, we will still provide customer support after this date.
I will see what we come up with at the alignment shop next week. They specialize in suspension and racing setups so they might be able to help me
09-12-14, 08:11 AM
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no ****? I should email Dan at PBM and see if that is what they do. This makes complete sense. The inner bearing is borderline indestructible. My only thoughts on tacking it would be that the pbm spherical outer shells are aluminum (I think). Thus, needing to be tig welded vs mig. Not a huge problem though.
09-14-14, 11:18 AM
#14
The PBM sphericals are aluminum. You can't weld them to the arm. MMRs do not need to be welded either, as they are aluminum. AWRs are steel, and can be tacked in place. The bearing itself comes out of all 3 and can in theory be replaced.
There are guys that have the PBM sphericals working perfectly, so you will just need to check if you have an installation error or part defect.
There are guys that have the PBM sphericals working perfectly, so you will just need to check if you have an installation error or part defect.
09-14-14, 12:17 PM
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yeah, mine came loose. But I think I stretched the metal from heat the first time around thus leaving the aluminum part to shift around under the cars weight if the Adjustable toe link comes loose.
Dan got back to me:
Dan got back to me:
sounds like the left and right side of the aluminum sleeve have some separation
The bearing itself is the very last thing that ever becomes loose even though people expect it to be the first thing.
If my assumption is correct, then tac welding the trailing arm edge where the new parts were pressed would indeed provide a physical barrier to prevent the sleeve from ever working its way loose sideways.
another thing to do would be to coat the trailing arm opening in epoxy and sand the opening and the aluminum parts for grip against the epoxy
The bearing itself is the very last thing that ever becomes loose even though people expect it to be the first thing.
If my assumption is correct, then tac welding the trailing arm edge where the new parts were pressed would indeed provide a physical barrier to prevent the sleeve from ever working its way loose sideways.
another thing to do would be to coat the trailing arm opening in epoxy and sand the opening and the aluminum parts for grip against the epoxy
09-16-14, 03:41 PM
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Went in for the alignment this morning. We ended up tacking on "ears" onto the trailing arm facing downward to hold the bearing in place on both sides. Works like a charm now.
10-07-14, 11:39 PM
#18
Man...haven't I told you to buy good parts! I went with battle version rear links and as others awr spherical bearings.
From my experience with pbm is they do half-a** jobs 2/3 the time and the other 1/3 I have no idea lol. I've only had good experience with the coilovers. Outside of those....I stay away.
From my experience with pbm is they do half-a** jobs 2/3 the time and the other 1/3 I have no idea lol. I've only had good experience with the coilovers. Outside of those....I stay away.
10-08-14, 10:20 PM
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10-09-14, 08:17 AM
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I'll see if I can get it in the air soon, lots of projects going on in the garage. The bearings work great, I just have a feeling due to the press fit nature, we stretched the hole just enough when we pressed it in the second time.
Going to weld the ears on the other side as well as a precautionary measure. I may drill and tap in grease zerts on them as well for that little extra "pow"
Going to weld the ears on the other side as well as a precautionary measure. I may drill and tap in grease zerts on them as well for that little extra "pow"
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