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Old 06-30-2008, 03:53 PM
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Join Date: Dec 2005
Posts: 18
What do you think caused this rust spot?

Picture is attached.
This is on a 1985 300td below the rear driver side window.
It seems to be in a weird spot. Is it indicative of something? What do you all think?

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What do you think caused this rust spot?-0005_1.jpg  
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Old 06-30-2008, 04:03 PM
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Join Date: May 2007
Location: Out in the Boonies of Hot, Dry, Dusty, Windy Nevada
Posts: 9,585
that is something you need to address asap. pull the molding off and you
might see more hidden. let it go and you will have a large hole.
It is caused by water, salt, dirt accumulation under the molding.

I think you need to get on it.

the longer you wait the costlier it will become. rust never sleeps. where there is a little, there is more.

there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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Old 06-30-2008, 04:09 PM
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Join Date: Jul 2007
Posts: 517

judging by the shape, it appears it is inline w/ the pillar suggesting further that it is something internal. could be a plugged water drain line that is overflowing down your pillar

i would first start by removing that metal strip. i believe that will pop out as most trim pieces like that do. see if there is further damage running to the right.

the best thing you can do though is to start removing some interior pieces to see if you can find the rust's start and end point and treat accordingly
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Old 06-30-2008, 04:21 PM
Mister Byrnzoil's Avatar
Currently Benzless :(
Join Date: Jan 2005
Location: Palm Springs, CA
Posts: 777
totally standard, many TDs came w/ this rust spot installed @ the factory. Also theres the OE rust patch on the rear hatch below the window....

mine has both.
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Old 06-30-2008, 04:57 PM
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Join Date: Nov 2004
Location: Nova Scotia, Canada.
Posts: 6,510
I have always blamed the type of body primer used by the factory. it seems to lift and let water penatrate under it too easily. Yours possibly got started from a very small scratch from the trim application. Or where the plastic mount for the stud on the trim penatrates the body panel.

Another guess is installing the plastic retainer in the hole originally might have scratched the paint and what you have now visable is the long term progression of that effect. I have seen many break out even in areas that make no sense. Anyways as soon as you pull that trim the original source is usually obvious. This problem is far from a mercedes exclusive. Yet in my mind they are the leaders.
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Old 06-30-2008, 06:58 PM
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Join Date: May 2008
Location: Northern California
Posts: 509
I have it on my 300TD

I have/had the same rust damage. It starts around the hole used by the trim clip. I had to cut out the rust, weld in a plate and fill. You can see
that once you get the trim off and the window out, the rust is probably
much more than you see. Dirt traps moisture. After I fixed this spot and
one above the tail light, I took off all the trim and found lots of trapped
dirt, and some just beginning rust. I fixed it all and now await my paint
shop appointment. Only a couple shops here will spray C/C Glasurit 55.
Take a look at my gallery to see how much metal I had to cut out. My rust
looked much like yours.

85 300TD FED-Daily
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86 XJS-Sunday
66 GMC-Work- Given to my stepson
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