Change the Hoses & Clean the Holes - Mercedes-Benz Forum

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post #1 of 5 (permalink) Old 11-08-2014, 05:53 AM Thread Starter
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Date registered: Oct 2014
Vehicle: 1981 W123 300TD
Location: OHIO
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Exclamation Change the Hoses & Clean the Holes

Well guys I'm hip deep in some serious 1981 w123 300td wagon stuff now. I heard sooo so much about how great these cars were I just had to have me one(with all the knowledge & $ I've spent:I'm a gluten for punishment give me 2 or 3 more )However, I FOR GOT TO DO MY HOME WORK!!! I believe I paid ENTIRELY to much for the vehicle based on how much work was needed to be done starting out of the gate (the car did drive when I purchased it) "HOW MUCH DID YOU PAY"(the audience asked) Don't ask.... $7,000 To date I have changed all belts, water pump, thermostat, power steering flush & filter change, power steering hoses change (both),replaced oil pan gasket , oil change, diesel purge, transm. filter change, new transmission fluid, new transmission hoses, rear diff. oil change, dropped fuel tank...had cleaned, replaced all the braided rubber fuel lines from back to front(even the ones that lead from the extra tank behind the spare tire and run under the 3rd seat)Clear lines in engine bay,New fuel filters ALL 3 Anybody got a tissue for me ? Is it free? And is it the kind that has the lotion in it? I got Brand New Tires, and SLS filter( got to get the right fluid ??). Heaven only knows if you don't keep this system clean you will have some serious issues.
Which Brings me to my drum roll. Oh,oh one more thing... (you can still start the drum roll) **Special shout out to Mach4 for responding back to me on how to modify my oil cooler lines*** I love you man. You have know ideal how your article changed my life....OK, OK enough with the gooky stuff( tissue please)
They say that the devil is in the details. If that's the case, then I changed ALL OF MY HOSES ON MY CAR! That's right. ALL RADIATOR HOSES !! I didn't know the history of the car, and some of the hoses looked very suspect at best. When I went to do a coolant flush (clean with SHOUT), that's when things got depressing for me Check out the pics. There was sooooo much Brown I was looking for Charlie. I didn't know what else would come out the hoses as well as that screw off to the side of the block (I do like my arms you know) And the crud in the holes...can you say awful. I tried to document as much I could on the vehicle as I went a long. I thought it would be a good ideal to let you see what part # you would need. It took me FOUR SCORES AND 1 YEAR to track the parts # down. It took me this long because 1) I was a newbie 2)I had a very long and hard learning curve that needed to be in my brain ASAP....and I didn't have the people or materials to learn from.3)I was trying to be cheap( excuse me, save $) and purchase my parts from 4 and 5 different vendors. Oh GOD! NEVER EVER DO THIS. I lost a month because of shipping and because of wrong parts being shipped to me. Never fear... I'm an IT genius, I've built G IV, GV planes. All I needed was Mercedes Benz Tech manuals( I'm talking the $3,000 gooood stuff) in addition to the other small books and I was running rings around the 300. THEN.....I noticed rust
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Last edited by Zeitgeist; 11-08-2014 at 11:07 AM. Reason: Disable poll as per OP request
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post #2 of 5 (permalink) Old 11-09-2014, 09:07 AM
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Vehicle: 68 250S, 91 300se, 98 SL500, 450SEL 6.9, 14 CLS550 Past MB's; 300SD, 300E, 300TE, 190E, ML420
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Brown gunk in cooling system is proof that all the items and fluids you changed were needed. Dont be ashamed because you did the right thing in taking care of years of delayed maintenance.

Even at $7K assuming exterior and interior is nice, you did fairly.

For whatever your next project is, check here for helpful advice before you get started.
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post #3 of 5 (permalink) Old 11-09-2014, 09:50 AM
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Those photos really drive home a point.
What's the saying, " a photo is worth a thousand words...".

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post #4 of 5 (permalink) Old 11-09-2014, 04:43 PM
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I had an 82 300SD that had brown gunky coolant, courtesy of a former owner who ran straight water in the system because we were in Florida. Duh!

The hoses were in great condition as far as flexibility, so all I did was a citric acid flush to be sure there was no oil in the system then filled it with the proper MB coolant.

Yes, the insides of the hoses looked bad for a long time, but the residue on them had no effect on the operation of the cooling system.

Flush it thoroughly, make sure the flushing water comes out clear, drain it as best you can and refill it with the proper MB coolant. You might want to put some Water Wetter (RedLine) or Royal Purple(?) coolant additive in it to increase surface tension to aid head transfer. These also have some anticorrosive additives in them that will stop the rusting or slow it down considerably.

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post #5 of 5 (permalink) Old 11-10-2014, 06:36 PM Thread Starter
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Date registered: Oct 2014
Vehicle: 1981 W123 300TD
Location: OHIO
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Thanks for that extra advice...I really need that right now. I'm really trying to get this car up an running by this weekend . Bad weather is coming and I have the car torn apart....I got my valve cover back and it has metal shavings in it. as I was cleaning it with mineral melted the gasket seal in the inside of the valve cover(Homer Simpson moment I think) What do I do Now???
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