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Expansion Tank removal/cleaning

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1995 E320 Wagon
1990 300E 4MATIC

The inside walls of my coolant expansion tank appear to have a thin grimy coating on them probably left over from a recent headgasket leak and replacement in. Coolant was flushed twice in last year, but oily film remains. I'd like to remove the bottle and give it a good cleaning.
Anyone have any instructions on how to do this? Can hoses be clamped off easily and bottle removed from its perch?
Thanks.

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Re: Expansion Tank removal/cleaning

Section 20-4500 of your manual provides the procedure.

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To order call 1-800-367-6372. Ask for Mercedes part number P-2700-124-099.

After obtaining the CD, you should download Steve Nervigs Index for the Service CDs. It allows you to use the CDs easily without having to learn what Mercedes meant when they structured their proprietary product. You can download the index at: http://web.mac.com/dakota/iWeb/Mercedes/Indexes.html

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Former Member
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1990 300E 4MATIC
Re: Expansion Tank removal/cleaning

Any chance you can post this or pm me with instructions,Robert?
I've pm'd you Robert

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Re: Expansion Tank removal/cleaning

As they say, "there are more ways than one to skin a cat."

"Degreasing" a plastic coolant reservoir tank isn't rocket science. I have used household degreasers like Dawn dishwashing liquid, Shout! laundry cleaner, and Simple Green concentrate to clean up plastic containters.

After removing the tank, immersion and soaking in a concentrated soltion helps, while you can address the grime that usually builds up on the outside with a nylon scrubber.

Flush and rinse till it's squeaky clean.

If you want the exterior to look nice and white again, you should probably buy a new tank as Don suggests, but be forewarned that the new tank will make the rest of your engine bay look awful by comparison. ;)

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Former Member
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1995 E320 Wagon
1990 300E 4MATIC
Re: Expansion Tank cleaning 94 E320 wagon

Robert,
I pm'd you with info. It's for a 94 E320.
Thanks in advance for emailing the instructions.

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Re: Expansion Tank removal/cleaning

and I E-mailed the instructions on the 29th. Does your ISP block E-mail from yahoo.com?

If so, I can resend it from another ISP.

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Re: Expansion Tank removal/cleaning

How about if I just post it here.

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Former Member
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1990 300E 4MATIC
Re: Expansion Tank removal/cleaning

Oops. Yes, your email was caught in my spam filter.
Thank you.
Chris

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Re: Expansion Tank removal/cleaning

In my experience the cleaners and soaking don't work 100% if you've had oil, dirt, etc. in the coolant. I tried them all, with hot hot water, soaking overnight, etc.: 409, Dawn, Comet, MB rad cleaner, etc. I removed the tank from the car, got out what I could using chemicals, then I used mechanical cleaning via long-handled scrub brushes, scouring pads, shovels, hoes, rakes, and other implements of destruction to get the last of the crud out. Came out pretty good.

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Re: Expansion Tank removal/cleaning

As a data point, clear or opaque plastics are easily dyed different colors. Plastic eyeglass frames are an example.

We used to take our Navy issue clear frames and put them in a coffee can of hot water and RIT clothing dye. Wonderful and permanent results.

The data point. If is discolored and the scum has been removed, the remaining color is permanent.

Someone will probably say that if you put the right chemical in it that will clean it. Yes, and if you get in there with a little bitty pocket knife, you should be able to eventually scrape away the discoloration.

If the new color of the tank is objectionable, replace it. They are not that expensive.

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