Sound from the rear-Part II, Bushing not greaed properly Options

[jim_hoyland]

The sound finally went away with an heavier application from the grease gun into the zirks yesterday. I used a heavy duty tractor bearing grease

I have been told that the bushing should have silicone grease on their outer surface and under the flange, which makes sense now. So I'll pull the arms, remove the bushings and try the silicone grease.

The creak started to come back today, albeit less noisy.

Any tip on do's / dont's on greasing bushings will be appreciated

[Eric_Shea]

Grooves are unnecessary. (IMG:style_emoticons/default/wink.gif)

Zerks are in the instructions and were already on Jim's arms.

Let's make it simple:

Question:

Rich, are you familiar with the hardness measurement of these bushings? Have you actually seen a set of these or, are you giving recommendations off the 94D bushings that are common out there?

Reply:

Nope

Data on 70D Hard Poly Bushings:

Hardness (shore D) ASTM D-2240 70 ± 5
Tensile Strength (psi) ASTM D-638 5,350 (about 2,350 psi higher than your "Shine" bearings)
Elongation at Break ASTM D-638 4% (they basically don't stretch)
Compression Strength (psi) ASTM D-695 NA (they don't compress)
Ultimate Flex Strength (psi) ASTM D-790 9,000 (more than 3x the weight of a 914)

Personal Experience with 94D Poly Bushings (notice the difference in the Shore D hardness rating):

I have personally installed two sets of plastic bushings in my car. Both sets made the same noise. Both sets had grease fittings. Both sets fit perfectly when installed. Both sets ovaled out within one year.

If you had agreed instead we would not be wasting energy arguing what I consider is now a moot point...

You see... I don't agree with you and neither do the facts or data. These bushings don't compress or oval like the standard 94D poly bushings that 90% of the people buy. Those are the bushings you have experience with and those are the bushings you are confusing these with herein. Jim should not "bin" them in my opinion so, I don’t agree. I have an inclining that you are smart enough to understand a Shore D rating of 94 vs. 70 so... please stop.

I will shut up if you can show me how superior they are...I will make a public apology because I am a big boy.

Please do... at least the shut up part. (IMG:style_emoticons/default/rolleyes.gif)