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Oil gets into the drum when the seal goes bad. Usually the seal goes bad
when the axle bearing goes bad. However, IMO it is highly unlikely that you
need a new axle. The only reasons you would need a whole axle is if the
bearing was completely frozen and managed to cut a groove in the axle, or if
the axle somehow got bent (extremely unlikely unless it's been hit).
These bearings and seals are extremely easy to replace. I would recommend
either getting a second opinion or trying to do it yourself. If you don't
own a slap hammer, you can take the drum off, turn it around, and put it on
backwards with enough slack so that the drum can move back and forth a bit
to create the slapping action. Just make sure you have caught enough threads
on the lug nuts so that the nut won't strip off. For some seals, you need a
tool called either a ladyfinger or lady slipper. You can also make one of
these out of a toggle bolt from a hardware store (used to hang heavy objects
on sheetrock, has a metal "butterfly" piece that springs out after it's
inserted in the hole). You usually have to un-bolt the brake backing plate
before you can pull the axle. Some axles have C-clips in the pumpkin, which
also have to be removed before you can pull the axle, and should always be
replaced with brand new ones. You'll have to take it to an auto parts store
that does light machine work to have the old bearing pressed off and the new
one pressed on. If you get a service manual, the whole procedure should be
in there. It should take you about a half hour tops. You probably should do
both sides, especially because the car is new to you and you don't know when
the other was replaced last. Usually if one is old the other is too,
although some people only replace one at a time to save a few dollars.
As far as this being a "common" problem, it is the natural result of wear on
a moving part. It is not unusual.
I also have a 69 El Camino, but haven't touched the rear yet, so
unfortunately I don't know the exact setup. If you live near me (NYC or Long
Island area), I'd be willing to stop by and show you how to do it, unless
you need it done immediately.
John
-----Original Message-----
Got a call from my mechanic, it seems that the rear axle bearing in my 69
Elky may have gone dry. He said that there is oil in the passenger side
brake drum and I may have to replace the rear axle. If so can anyone tell
me what axles can be swapped (i.e. chevelle, Monte, etc...).
Also is this a common problem or am I just the unlucky one.
Thanks
JM
69 El Camino (work in progress)
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