330 Leaf Spring Bushings

330 Leaf Spring Bushings

Yale's 330

My friend Yale’s car is in for some suspension work. After driving my car several years ago, Yale felt a distinct difference between the two. I attributed it to the worn spring bushings because I went through the trouble of replacing them. We finally found the time to do this job.
leaf springs

Pulling the rear springs out of a Vintage Ferrari is one of the least fun things to do, and probably the most dangerous if you don’t have the right tools. In fact, many cars I’ve seen have worn bushings because it’s such a pain to replace!

The bushing material used in the spring eyes is a very soft material that crumbles away over the years. If it doesn’t all disappear, it still doesn’t do much good deforming inside the spring eye allowing the shackle to move excessively. You can see how Yale’s bushing has completely deformed from the worn out bushing. You can often feel this deflection when driving a car that seems to feel loose in the rear end, especially when taking a corner. The really worn ones will rattle and clunk.

Digging out the bushing is pretty easy as it’s soft and crumbly. I’ll machine new ones from a harder material eliminating the slop.
leaking axle

When I took the wheel off Yale’s 330, I found the hub filled with gear oil. This example is exactly the reason you need to put RTV on the washer and nut assembly on the axle shaft. On some cars, gear oil will not leak past the oil seal, but will find its way past the hub splines, behind the washer and nut. Eventually, the hub will fill up with oil and find its way out onto the wheel.

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Tom Yang

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