'70 300SEL conversion - Mercedes-Benz Forum

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post #1 of 28 (permalink) Old 05-23-2010, 09:18 AM Thread Starter
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'70 300SEL conversion

OK, so it's decided. Years ago, my dad bought a '70 300SEL 3.5. It's been sitting unused for a good 20 years, and aside from surface rust, the body is in a "barn-found" condition - no chassis rust whatsoever. The car is mine now, and I plan to use the interior of my W108 as a donor for the 109.

The engine however, is long gone, and I'm transplanting a carb'ed Ford 350 and a 6R60 transmission into the car.

Years ago, dad put a non-air-bagged 108 suspension into the car, something I'm considering changing. Maybe a more modern air ride.

Once my deployment ends, I'll start in on the transplant, then the body, and then the interior, and then other stuff.

If you could build your own 109, had a decent budget and some spare time, what would you do to the car?

Body-wise, I'm looking for originality. It should look like a 109. Everything else is up for debate.
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post #2 of 28 (permalink) Old 05-23-2010, 12:57 PM
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Vehicle: 1965 220se w111 *******1984 300sd w126 *******1991 350sd w126
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This will be a good project to follow, keep us posted on progress. Later.

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post #3 of 28 (permalink) Old 05-23-2010, 08:00 PM
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Why a Ford 350? a Euro 5.0 or a 5.6 M117 would be much easier to fit and also offer some development possibilities. If you were to choose that option I could give you a lot of info on how best to do it by using the MB parts bin, as i did it myself twice. Mercmad 6.3 could also help you as he did that conversion too.
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post #4 of 28 (permalink) Old 05-24-2010, 07:03 AM Thread Starter
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I did the Ford conversion with my dad (with a 220S) when I was 16, so the bugs are worked out, pitfalls understood, etc etc. I prefer the Ford engines because they are plentiful, cheap to fix and understood by a much wider audience. I'm not a purist by any means, so what kind of powerplant is under the hood is not a concern. As long as it looks like a 109, I'm happy.
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post #5 of 28 (permalink) Old 05-25-2010, 09:28 AM Thread Starter
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That, and I was given the engine already... However, a modern Mercedes engine in a classic Mercedes is not without its charms. Aside from bending/changing or welding metal, what else do I need to get? Pricing an engine/transmission is easy - it's all the other stuff that I'd like to research.

Any changes needed to steering arms? Cross members? If I had all parts available, had a well-stocked set of tools and hoists, and was reasonably handy with a welding rig, how long would it take me?
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post #6 of 28 (permalink) Old 05-25-2010, 11:08 AM
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If you go for a 5.0 of 5.6 alloy block M117 engine, there is no bending/changing or welding metal needed as far as you're using the right parts from the MB Parts bin. Basically these are W108 4.5 engine brackets and r107 5.6 exhaust manifolds. It will bolt on and clear all chassis/steering parts.

A US 5.6 is a good candidate for boosting.
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post #7 of 28 (permalink) Old 05-25-2010, 04:08 PM
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I have a Mercedes motor in a Ford so I am all for putting whatever power in whatever car you want, but what is a Ford 350? I know Ford built a 351. The tranny you mention is out of explorers and such. Will it hold up to a big V8 like that? I just have not seen anybody use that tranny without some major mods to it.
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post #8 of 28 (permalink) Old 05-26-2010, 09:46 AM Thread Starter
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I stand corrected - a 351 indeed. The tranny I'm interested in is from an explorer - I like the idea of so many gears and a good final gear ratio. The current transmission has three gears, and the engine howls at highway speeds. It's also a gas hog...

What's the Parts Bin, by the way?
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post #9 of 28 (permalink) Old 05-26-2010, 05:25 PM
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MB Parts bin means considering all the parts that MB has been using on different models. Some are interchangeable and sometime happen to save alot of mod/fab work as they fit straight on both ends: the car and the engine; or the chassis and the transmission,or the transmission and the prop shaft etc.
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post #10 of 28 (permalink) Old 05-27-2010, 06:07 AM Thread Starter
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Ahh, understood.
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