Text 261, 55 rader
Skriven 2009-07-10 14:25:50 av Roy Witt (1:387/22)
     Kommentar till en text av Dan Ceppa (1:138/666.0)
Ärende: Master Cylinders
========================
09 Jul 09 17:09, Dan Ceppa wrote to Roy Witt:

 DC>> Not all tubing is stainless.  And, even stainless will rust.

 RW>> A friend of mine found a 25yo Buick that he wanted to buy. When he
 RW>> asked me to inspect it for him, I found brake lines that were rusted
 RW>> thru and leaking fluid on everything. It was a nice car for it's
 RW>> age, but the underlying rust problem made it unworthy of a guy who
 RW>> has little mechanical apptitude.

 DC> Doing a good brake job isn't easy, and it's expensive!  Based on what
 DC> you wrote, probably every piece needed to be changed out.

That's what I figured too. My friend is a willing worker, but you can't
leave him alone on a project like that.

 DC>> Brake temperatures can approoach 1,000 deg F.

 RW>> was brake linings burning. Come to find out she had the parking
 RW>> brake on the whole time. I had to let the brakes cool for about an
 RW>> hour before I could drive it and have brakes.

 DC> Some GM models have super pricey parking brake pad!

On the above car, a 63 Corvette, it only had drum brakes.

 DC>> It's all a matter if dissimilar metals plus, once again, heat.

 RW>> His Mazda has a cast iron block and alloy head. Once the radiator
 RW>> gave up and the engine overheated, the possibility of the head
 RW>> warping is very high. Replacing the radiator is the least of his
 RW>> problems. And with the dissimaler metals, head gaskets get eaten up
 RW>> by corrosion.

 DC> A warped head can't be just straighten, either.  I do know of some
 DC> people that straightened out cast heads by dropping them on the
 DC> floor.

When I had the machine shop, I had a machine, I called Bertha because of
her size, that was capable of machining even 6 cylinder heads flat. I'd
first set the head up on the granite, indicate the high and low spots,
mark them and then shim the head on the milling table to match what I
found on the granite. There's really no good way to machine them flat,
since machining the high spot will reduce combustion chamber sizes and
leave the low spot chambers bigger. My European expert mechanic across the
parking lot would CC those chambers and grind enough out of them to make
them, within reason, equal sizes.

                R\%/itt

Joy lives in the fight, in the attempt, in the suffering involved, not in
the victory itself.

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