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Where to Apply Syn Grease to Poly Bushings

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Old 06-13-2018, 12:51 PM
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81c3
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Default Where to Apply Syn Grease to Poly Bushings

Quick question.... when assembling the poly bushings, the bore of the part is not lubed, nor is the outer portion of the bushing correct?

I should only lube the inner bore and the outer part of the sleeve... is that right?

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Old 06-13-2018, 01:06 PM
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Originally Posted by 81c3 View Post
Quick question.... when assembling the poly bushings, the bore of the part is not lubed, nor is the outer portion of the bushing correct?

I should only lube the inner bore and the outer part of the sleeve... is that right?
I lube my sway bars with every oil change after cleaning the dirt off it and the poly's hole, then applying a light coating of the lube to each, but not on the bracket side.
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Old 06-13-2018, 04:34 PM
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mtwoolford
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I lube everything; Anything that can be lubed is lubed.
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Old 06-13-2018, 06:17 PM
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Originally Posted by mtwoolford View Post
I lube everything; Anything that can be lubed is lubed.
Same. I smothered the shhhh out of mine because I had the grease and didn't want it to squeak.
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Old 06-14-2018, 07:02 AM
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Originally Posted by 81c3 View Post
I should only lube the inner bore and the outer part of the sleeve... is that right?
That's what I'd do. The sleeve that rides in the inner bore is supposed to rotate within the inner bore. So that definitely needs to be lubed. The urethane is not supposed to spin inside the outer metal shell. So I would not put grease on the outer surface of the urethane.
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Old 06-14-2018, 08:01 AM
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Default Lube everything!

I recently spoke with the tech guy at Prothane, because one of my newly installed poly bushings on a control rod was rotating within the rod. They recommended lubing the bushings anywhere the polyurethane comes in contact with metal. Even the outside diameter of the bushings that gets pressed into the rods. Again, following the lube everywhere the bushing contacts metal, they also recommender to lube the "face" of the bushings where it connects to the brackets or spindles, etc.

He also said that (although not officially recommended by the manufacture,) you can use any type of weatherproof lube, such as an anti seize to lubricate the bushings. Since I was out of the specimen sized tubes of their special lube, I used some Copper based anti-seize on a few of the outside diameters, that are not supposed to move. I would stick to the special lube that the manufacture supplies with their bushings for lubing the inside diameter of the bushing where the metal sleeve is supposed to rotate within the bushing.

Last edited by adamsullivan44; 06-14-2018 at 08:08 AM. Reason: Not done
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Old 06-14-2018, 08:10 AM
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Originally Posted by MatthewMiller View Post
That's what I'd do. The sleeve that rides in the inner bore is supposed to rotate within the inner bore. So that definitely needs to be lubed. The urethane is not supposed to spin inside the outer metal shell. So I would not put grease on the outer surface of the urethane.
This is what Im leaning towards. VB&P also shows a video on doing it this way and it said several times NOT to lube the outer part of the bushing where it fits into the bore. Only lube the "working" parts of the bushing.
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Old 06-14-2018, 11:06 AM
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Originally Posted by 81c3 View Post
NOT to lube the outer part of the bushing where it fits into the bore. Only lube the "working" parts of the bushing.
More is rarely better, especially in this case, as the grease ages and gets infused with dirt and grit, it becomes more like glue and might even accelerate wear on any rubbing parts, grinding away with every turn.

I am less concerned about squeaks thanthe above and disfunction of the parts, which might be indicated by such noises, as resistence to movement is what generates it!

After I clean/lube those innards, the car's handling improves ever so slightly.

Last edited by whalepirot; 06-14-2018 at 11:07 AM.
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Old 06-14-2018, 02:46 PM
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Originally Posted by 81c3 View Post
This is what Im leaning towards. VB&P also shows a video on doing it this way and it said several times NOT to lube the outer part of the bushing where it fits into the bore. Only lube the "working" parts of the bushing.
I agree. I don't think lubing the outer diameter of the bushing or the shell it presses into is a good idea, because that only encourages movement that isn't supposed to happen. We don't want that! in fact, with offset bushings if that rotation happens you will lose your alignment immediately. That makes no sense to me. OTOH...

Originally Posted by adamsullivan44
they also recommender to lube the "face" of the bushings where it connects to the brackets or spindles, etc.
This is something I forgot to include, and I agree with this recommendation. This is an area where the urethane "faces" could make contact with the metal tabs or lugs into which the arms are bolted.
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