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Old 11-05-2002, 04:27 PM
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1966 250S To buy or not???

I am condidering buying a 250S 1966 - body in great shape, a few cosmetic things to do, previous owners UNKNOWN, seller states if he was to do any work on it the exhaust system should be worked on......the transmission shifts fine but seems a little hard on the gearing slipping just a hard change....the driver said that the oil should be changed every 2x of gas being put in......also vehicle seems to like 60-70 mph....not more is there anything here that seems unusual or stay away from or could it be fine? Dont know a MB tech in the area of Walnut Creek Ca to go out and check??

Thanks, Volf
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Old 11-05-2002, 06:19 PM
Registered User
Join Date: Jan 2002
Location: England
Posts: 1,841
I would try the 'vintage mercedes' section of this forum for a better response

good luck!

2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
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Old 11-05-2002, 09:41 PM
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I think that a 4-speed manual in this model is worth it's weight in gold. The auto? Well, as long as you understand that shift smoothness will never equal a contemporary American automatic, and that 0-60 times will be North of 13 seconds, why not?

Obviously, this presumes that the trans is in good repair and adjustment.

Carbs can be troublesome due to heat-induced warpage of the carb body. Rustproofing was not a Mercedes strong suit during this era, check the usual places plus the top of the front fenders just behind the headlight units, and the bottom of the spare tire well.
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Old 11-05-2002, 10:18 PM
Ken Downing
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The 66 250S is a great car.. I sold mine that I had for years to a fellow in Hayward a couple years ago...

About the trans.. It was the first that Mercedes built.. It has no converter.. Its a lock up clutch... On the front carb there is a small switch with some thing like points in it.. when you are at an idle it opens the clutch so it will idle at a stop.. when you step on it and it gets to 800 to 900 rpm the clutch closes and all shifts after that are made with the clutch locked up.. An early version of the luck up clutch that americans invented in the 80s.. (Ya right).. With the small engine Mercedes did not want to loose power thru the converter like they had been doing with the Warner transissions that they had been using..

The old 250 single cam engine was a hold over from the early days of trying to make the engine last for ever some thing that both RR and Mercedes were doing from the 30's . They burned oil.. Lots of oil.. right from the factory.. the blow by in the engines blew lots of oil thru the vent in the valve cover over to the carbs and the engines were set up loose with almost no.. or no valve guide seals.. So the whole thing was kind of a controled leak to the carbs where it was sent into the pistons and lubed every thing including the valves ... At speed.. 100 plus mph it was common to burn a gallon per thousand miles in those old things.. and around town a quart every other tank of gas... Those old engines are still running with hundreds of thousands of miles on them and when you tear one down it showes little wear..

These smoking engines did not go over well here and were only brought in a couple years.. then they redesigned the engine and put a 250 in the 114 cars.. However it was not the same engine that was in the 250S cars of 66 and 67..

Great car.. But finding some one to work on it if you do not will be a problem as most do not under stand the twin carbs with switches the run the clutch on the automatic trans.. and every one wants to over haul it because it burns oil... Like it did when new..

If you do your own work it is a great car to own.. and one of the best looking cars Mercedes ever built..

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