Great sound advice Roger. I'd try all these in this order. Save this mail
for future reference.
Terry Smith
-----Original Message-----
From: Roger Gibbs <rgibbs(at)pacbell.net>
To: Robert Wiseman <rob(at)wisemaninsurance.com>
Cc: alpines(at)autox.team.net <alpines(at)autox.team.net>
Date: Saturday, January 30, 1999 2:54 PM
Subject: Re: DPO
>Robert Wiseman wrote:
>>
>> The DPO of my Series I has rounded off all the bleeder screws for the
>> brakes. What would any of you suggest as the best way to try and get
>> them out so I can replace them.
>
>My thoughts:
>
>Principle #1: Start with the least potentially damaging operations and
>only move up as needed.
>
>Principle #2: Patience is a tremendous virtue with frozen threaded
>pieces.
>
>Some of the things that I have done in the past:
>
>1. Soaking and tapping are completely non damaging. Soak the piece
>with penetrating oil. Liquid wrench is a common product. Much has been
>written about Kroil oil, although I have not used it. Apply penetrating
>oil, then use a light weight hammer tap the fitting (many light taps).
>The hammer tapping does two things, the vibration helps the oil to
>penetrate and also may break loose a rusted joint. If you are not in a
>hurry, do this several times over a one or two week period.
>
>2. Application of heat is usually helpful, although I would be careful
>not to get a brake caliper too hot. Same idea as tapping - the
>application of heat leads to differences in thermal expansion and might
>break loose a tight fitting.
>
>3. Vise grips, pliers, and the like (including the Sears type) are
>potentially going to cause more rounding and I would avoid those if at
>all possible.
>
>4. I have a large assortment of sockets and I would try to find a metric
>or english socket, preferablly a six sided socket, that fits. I am able
>to usually find a socket that is just undersized that I am able to
>hammer on to a rounded fitting.
>
>5. Using a very small chisel, tap with the chisel on the outside of the
>fitting so as to cause it to back out (I am not explaining it very
>well). Use many light taps. Surprisingly successful usually.
>
>6. Once or twice, when nothing else would work, I have welded a nut on
>the end of rounded bolts, sometimes on to broken shafts. A MIG welder
>is able to weld quickly enough that there is not excessive heat applied.
>
>Good luck.
>
>-Roger
>
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