1972 280SE 3.5 (W108) Restoration - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 08-22-2016, 05:14 PM Thread Starter
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1972 280SE 3.5 (W108) Restoration

Hi all, I've been lurking around this forum for some time now, gaining all important knowledge from other posters. Thought it was about time posted something of my own!

I purchased this W108 around a year ago from a private collector. He was an older gentleman, who had about 10 Mercedes that he had collected over the years. Unfortunately he had been battling with terminal leukemia for some time, and was selling his collection to fund treatment.

I bought one of his W108's sight unseen, while I was working overseas. I had it transported to my home town, and stored for 4 months before eventually moving home to New Zealand, and taking a first look at what I had bought.

This was my first glimpse, was pretty dusty but looked in reasonable shape.



I was told that it ran and drove, however upon putting a new battery in, it wouldn't start. So the next thing to address was fuel. I figured the fuel had probably been sitting for a while, so I dropped the fuel tank, got a new fuel filter (genuine of course), and a bunch of new fuel lines. Also changed the oil, and gave the spark plugs a good clean up.


Note the gunk all over the diff....







Added some new high octane fuel, and some injector cleaner additive.
Started up first pop, good oil pressure, no smoke or strange noises. Very pleased
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post #2 of 7 (permalink) Old 08-22-2016, 05:23 PM Thread Starter
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Once it was up and running, I moved it to the big garage at my new house.

Gave it a good clean up and a bit of a polish, to see what was under all that grime.





Came up pretty well! A high quality repaint will be on the cards in the future, but is pretty low down on the list at this stage.

PS. I had a bit of trouble sizing and uploading the images, so if you can't see them or they're too big, let me know.
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post #3 of 7 (permalink) Old 08-22-2016, 09:23 PM Thread Starter
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I have a wee problem that I wouldn't mind a bit of help with, if someone can chime in here.

I took the rocker covers off to clean the oiler tubes and inspect chain, tensioners etc... This is what I found:



Unfortunately a head bolt had broken off. Washer and bolt head were just sitting there, haven't appeared to cause any damage luckily! I managed to get the bolt out with a few taps and a good pair of vise grips.
The thing I would like to get some advice on, is what to do now? I have ordered a genuine replacement head bolt, but I am wondering what the cause of this happening could be.... Would it be best to replace all head bolts? Bit of a pain without the specialty tools. But could be done.
If not, should I re-torque the old bolts? The ones I can get to at least... Let me know your views. Cheers
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post #4 of 7 (permalink) Old 08-23-2016, 06:58 AM
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Vehicle: 1972 280SEL daily driver. 904 Dark Blue with cognac interior. euro 4.5 engine
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I have pulled/replaced several heads on 4.5 liter cars with none of the "special" MB tools. I purchased an 8 mm 6" long ball end hex and use it on all the hard to get to head bolts. Works great. The one I have is similar to this one:

3/8 Inch Drive, 8mm Ball End Hand Hex Bit 44153179 - MSC


I would be tempted to replace it, run the engine, and re-torque that one when hot. Why, because your head gasket is obviously not leaking and the car before last, I ended up breaking 2 head bolts off when pulling the head. It is a pain.
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post #5 of 7 (permalink) Old 08-23-2016, 02:14 PM
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I agree with replacing the bolt. I've seen this happen several times to the older diesels (615's &617's) and each time I was lucky enough to get the broken head bolts out, I replaced them, re-torqued and went on my merry way.
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post #6 of 7 (permalink) Old 08-31-2016, 05:24 AM Thread Starter
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Does anyone have pictures of an M116 3.5 engine in it's factory form? Maybe some old pictures from Mercedes Benz brochure or something. Looking to restore my engine bay to as close to original as possible. Would like to know which parts to have yellow zinc plated, etc. Thanks in advance.
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post #7 of 7 (permalink) Old 08-31-2016, 05:32 PM
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Vehicle: 1968 250S, 1991 300se, 1998 SL500, 1977 450SEL 6.9. Past MB's; 300SD, 300E, 300TE, 190E, ML420
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Garage
These are a 6.9, first is a factory rebuilt engine the second a sales picture.

Note however that the sales pictures may look better/different than the actual production engines.

Search this forum, there is guy that posts/ has a site for hundreds of Mercedes brochures.

this was posted just a few days ago http://oudemercedesbrochures.nl/Engels_index.html
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Last edited by rumb; 08-31-2016 at 05:34 PM.
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