1970 220D Introduction - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 10-11-2014, 07:52 PM Thread Starter
BenzWorld Junior Member
Date registered: Oct 2014
Vehicle: 70 220D
Location: Santa Barbara, Ca, USA
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1970 220D Introduction


I recently purchased a 1970 220D with a 4 speed manual. Pretty clean, a little rust, but repairable.

The motor was supposedly swapped to a 240D, but the block reads its a 615.912. It didn't take too long to spin a rod bearing, lol, and upon dissasembly I noticed a lot of things like one rod having a different type of nuts on it. It was definetly a DIY rebuild.

I have since purchased a 71 220D motor for $500, with a warrenty. I got it home and on the stand, adjusted valves, and performed a leak down test. 30% loss on 3 cylinders, 55% loss on one! Granted, this is cold test and its been sitting. Judging by the sound, the worst cylinder is having an exhaust valve problem.

On a good note, this was an original owner motor and went to one shop. It has lots of good signs like indexing on the flywheel to keep it balanced correctly.

I'm at a loss of what to do next. I wasn't planning on doing a motor yet.

I could throw this motor in and see if it settles down, it sat for 6 months. I could take it back and rebuild my original motor, I've located a good crank and another rod for about $150, plus the cost of rings bearings valves etc.

Or I could rebuild this motor, as it most likely still has the factory balance.

If I rebuild anything, I was planning on honing the cylinders and going next oversized rings. But I can't even find them. I saw an OE size for $320. I found some new old stock deves for $60 for a set, and sleeves for $30 each, but then I'm looking at having to goto a machine shop.

Thats about where I am at. Not too sure what to do. But I was excited to see this forum and some other 114 guys.
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post #2 of 4 (permalink) Old 10-11-2014, 08:25 PM Thread Starter
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Date registered: Oct 2014
Vehicle: 70 220D
Location: Santa Barbara, Ca, USA
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I guess, can I find a set of oversized rings and what will they run?
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post #3 of 4 (permalink) Old 10-12-2014, 09:00 AM
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Sorry to hear about your motor. I would rebuild the new one your buying. The closer something is to factory the better the chances of it working. Once I figure out how to down load photos will show you my 220d. Would like to see yours
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post #4 of 4 (permalink) Old 10-13-2014, 07:44 AM
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i would put the new motor in and see , it maybe ok .
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