A heads up on poly bushings - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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A heads up on poly bushings
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Posted by Noel (more from Noel) on Sun, 28 Jun 2015 08:30:46 Share Post by Email
In Reply to: Suspension work planning, '02 Viggen, Erik919kt, Thu, 25 Jun 2015 07:08:19
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The lower control arm has a pressed in bushing where the stanchion arm connects that is likely worn out. Some people remove the stock one and replace it with a two-part poly version. This may or may not be OK.

The 2-part poly bushing the PO had installed on the '00 SE (HOT) I bought for my daughter was held in place with a larger than stock diameter bolt and lock nut. It works, but can cause problems. Here's why:

In the OEM version, the stock bolt goes through the top of the stanchion arm, the pressed-in rubber bushing, and screws into threads in the bottom side of the stanchion arm (Locktight red is used for retention).

With the 2-part poly version we had, the bolt for the bushing passes through the center of the poly bushing and through the bottom of the stanchion arm, which must be drilled to accommodate the larger diameter bolt, removing the threads in the bottom side of the arm.

Everything is then held together with a lock nut. That's OK, except for one thing: The end of the bolt extends about 12mm below the nut. This is fine until the bushing softens up. Then the protruding end of the bolt hits the inside edge of the front wheels when at full lock, even at low speeds (like 2 mph).

This doesn't mean don't use poly bushings, but see how they are put together when mounted. Sure, you could shorten the bolt, but good mechanical practices are for bolts to extend at least 3-4 threads beyond a lock nut.

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