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Technical / Re: Replace Studs on Manifold
« Last post by Ted on May 24, 2018, 05:03:02 PM »
Try welding. Put a nut on the stud and weld both together through the nut hole. Usually the welding heat burns the rust, heats the metal, releases the threads, so after the welding in most cases the stud can be unscrewed with the nut.

 Of course, once in a while this does not work, the stud or the weld breaks and then the option is to drill it. If the threads are bad/corroded or get damaged during the drilling and stud removal, you can put a special spring coil inside, which replaces the threads and lasts forever. Can be drilled even by hand, but the best would be using a milling machine. Another option - erosion, but you would need to locate a special shop where they do the job.

I would not recommend using an extractor tool /on a manifold/, too often the result is broken extractor in the stud, which then brings the need for super hard drills or electro-erosion.
Technical / Replace Studs on Manifold
« Last post by John Nguyen on May 24, 2018, 03:02:37 PM »
Hi All,

What are the best ways of extracting and replacing broken Studs on old Manifold, please see picture.

John Nguyen
Postwar 170S / 170 sb for auction
« Last post by hansvdc on May 13, 2018, 09:37:39 AM »
Engine from a190sl..

very low estimate
220 / Re: 220 Engine Rebuild
« Last post by Owen on May 07, 2018, 09:40:43 PM »
Hi Guys,

Just a quick note regarding the “gold” looking plated parts from Mercedes-Benz engines and other parts of the 60’s.  This was not actually a zinc coating at all but an electroplated cadmium coating.  Cadmium is a soft white metal that is plated onto steel, and other ferrous materials.  It protects the surface as a "sacrificial coating," corroding before the substrate material.  Unfortunately cadmium (apart from being a little dangerous to health) is soft and can be easily deposited onto hands by repeated handling the article.  To enhance the corrosion protection of cadmium plating and minimise health risks, plain cadmium, that has the potential to come into contact with the body, has a chromate conversion coating that can be applied over the plated metal, yielding the familiar gold colour as Henry has noted.

By the 80’s health and safety issues meant cadmium was being phased out in favour of a very thin coating of zinc.  Zinc normally has a shiny surface but is often dull when the surface preparation is less than optimal, or it is being sacrificed to preserve the base metal.  There are platers that can passivate this material too, in an attempt to give it the cadmium look, however, it does not enhance the protective qualities of the plated materials.

My 1951 170S has fasteners (nuts and bolts) protected by oil “blueing” of the steel parts, with no other protection applied that I can see.  There is little or no plated parts in the whole vehicle other than the bright metal decorative parts.  I suspect you’d need to get right up to the 1960’s before seeing passivated cadmium.  By 1990’s this too was disappearing for zinc.

For accuracy, fasteners should have that familiar black “oil-blue” colour up until 1953 anyway.
220 / Re: 220 Engine Rebuild
« Last post by Scott Montoney on May 05, 2018, 04:22:09 PM »
I believe it is currently at the Machine shop, working on the head rebuild.  I think the block is done.
Progress is slower than expected but I believe it will be in good shape when it is finally done.
220 / Re: 220 Engine Rebuild
« Last post by yan2947 on May 05, 2018, 07:04:55 AM »
How is the engine rebuild going?
General Discussion / Re: 170Da OTP
« Last post by Stephen Dietrich on May 03, 2018, 10:18:01 AM »
 Does anybody have any idea what the value of my Mercedes 170Da OTP  would be?   It’s pretty rough but mechanically sound and 100% intact.  Any help in this matter would be greatly appreciated.  Thanks, Stephen
General Discussion / 170Da OTP
« Last post by Stephen Dietrich on May 01, 2018, 12:03:52 PM »
 I realize that this is part of the general discussion topic but I didn’t want to put it in the classifieds. I am probably going to sell my 1952 170Da OTP. Reason why am not putting this in the classifieds is because I’m not sure how much I’m going to sell it for and I have no pictures to post. Rebuild engine with no miles on it the car is complete and the top is shredded. If anybody would like to contact me off-line,  please Do so. Thank you, Stephen Dietrich
Classifieds / Re: Boot lid lock handles
« Last post by BrianWelton on April 24, 2018, 11:21:23 PM »
Sorry to report my trunk lid was missing the handles :'(
Classifieds / Re: Boot lid lock handles
« Last post by BrianWelton on April 21, 2018, 01:19:56 PM »
I think I have a pair gibe me a few days to locate them.

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