I need some help with a Rust Problem. - Mercedes-Benz Forum

 
LinkBack Thread Tools Display Modes
post #1 of 4 (permalink) Old 09-10-2008, 08:12 AM Thread Starter
BenzWorld Extremist
 
lfedje's Avatar
 
Date registered: Mar 2008
Vehicle: 1973 450 SL
Posts: 1,099
Mentioned: 1 Post(s)
Quoted: 1 Post(s)
(Thread Starter)
I need some help with a Rust Problem.

I have a 1973 450SL, which is now in absolutely gorgeous condition, however I recently found an area of rust, and would like to get some opinions as to how best to proceed with a repair. This is the only rust that I have been able to find, and believe me, I have looked everywhere.

The area, as shown in the following photos is located at the drain area on the passenger side of the car, in the Blower compartment. One way would be to cut the whole section out, and replace it with a section cut out from another car, but I really don't want to go that far.

I was thinking that perhaps one way to handle this would be fiberglass and then POR-15. The fiberglass could cover the whole area and then down into the hose fitting (using fiberglass cloth for reinforcement around the hole), or perhaps using POR-15 may do the whole trick by itself. Don't really know.

This problem was caused by a kink in the drain hose. I have now cleaned out the drain hose and removed the kink that caused the problem.

It is my understanding that the drain holes in the blower compartment drain off water that seeps in from where the wiper arms enter the cowl. I wouldn't have thought that water would enter from the wiper arm area, but if that's the case, so be it.

Here are the Photos:













This is a shot taken of the underside, where the hose attaches to the fitting:



Again, any help would be appreciated.

Here is an example of a situation which was much more extreme that what I have, and in this case the whole Blower compartment was replaced with one from another car - see This Post

That was a complete replacement, and cost a ton of $$$$.

Loren
lfedje is offline  
Sponsored Links
Advertisement
 
post #2 of 4 (permalink) Old 09-10-2008, 01:08 PM
BenzWorld Elite
 
Grubeguy's Avatar
 
Date registered: Jan 2006
Vehicle: 73 280SE 4.5, 71 300SEL, 03 BMW Z4, 72 Fiat 850, 80 Triumph TR7, 85 Porsche 911
Location: DC Area
Posts: 2,110
Mentioned: 1 Post(s)
Quoted: 96 Post(s)
Send a message via MSN to Grubeguy Send a message via Yahoo to Grubeguy
Have you thought about sand blasting? I've done that with a fender, and it was fast (it damaged the metal though - deformed it). I would suggest baking soda blasting - same concept as sand blasting, but with the powder stuff. It makes a mess, so you'd need to cover everything prior to. After you blast out all the rust, you'd need to treat the area with rust stop, and then primer/paint.
Grubeguy is offline  
post #3 of 4 (permalink) Old 09-10-2008, 01:48 PM
BenzWorld Elite
 
MBGraham's Avatar
 
Date registered: Oct 2006
Vehicle: '72 350SL, '85 300D, '98 E320, '14 GLK250
Location: Ont, Canada
Posts: 7,838
Mentioned: 1 Post(s)
Quoted: 8 Post(s)
Quote:
Originally Posted by lfedje View Post
I have a 1973 450SL, which is now in absolutely gorgeous condition, however I recently found an area of rust, and would like to get some opinions as to how best to proceed with a repair. This is the only rust that I have been able to find, and believe me, I have looked everywhere.

The area, as shown in the following photos is located at the drain area on the passenger side of the car, in the Blower compartment. One way would be to cut the whole section out, and replace it with a section cut out from another car, but I really don't want to go that far.

I was thinking that perhaps one way to handle this would be fiberglass and then POR-15. The fiberglass could cover the whole area and then down into the hose fitting (using fiberglass cloth for reinforcement around the hole), or perhaps using POR-15 may do the whole trick by itself. Don't really know.

This problem was caused by a kink in the drain hose. I have now cleaned out the drain hose and removed the kink that caused the problem.

It is my understanding that the drain holes in the blower compartment drain off water that seeps in from where the wiper arms enter the cowl. I wouldn't have thought that water would enter from the wiper arm area, but if that's the case, so be it.


Loren
Loren,

I have never opened the blower compartment, but I guess I should have a look!

i would think that the rust could easily be treated with POR-15. I would use it as the first coat - this eliminates the need to sandblast and prime. Once you have one good coat to seal in the rust, you could use some thin fibreglass cloth or even window screening to place over the cracks and pin holes. Use POR as the resin to apply the fibreglass. If there are still some holes, you can apply some epoxy filler - boating stores stock this - one make is MARINETEX. Then give whole thing a final coat of POR.

I used this technique on a much worse situation and it is still good 18 years later.

Good Luck

1972 350SL 4.5L - MBGraham, near Kingston, Ontario
MBGraham is online now  
post #4 of 4 (permalink) Old 09-11-2008, 08:32 AM Thread Starter
BenzWorld Extremist
 
lfedje's Avatar
 
Date registered: Mar 2008
Vehicle: 1973 450 SL
Posts: 1,099
Mentioned: 1 Post(s)
Quoted: 1 Post(s)
(Thread Starter)
Thanks, Guy's

I will keep both suggestions in mind. Nothing is going to be done until it's taken off the road for the winter, so I have a bit of time to think about it.

If in fact the POR route is as good as you say it is, Graham, this may very well be the route I go. By doing this, there is no doubt that I will have to get at the back side of the metal as well, but by taking out the lower dash section and the cardboard piece behind that, I think I should be able to get to it fairly easily.

Loren
lfedje is offline  
Sponsored Links
Advertisement
 
Reply

  Mercedes-Benz Forum > General Mercedes-Benz Forums > Vintage Mercedes-Benz

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











  • Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
     
    Thread Tools
    Show Printable Version Show Printable Version
    Email this Page Email this Page
    Display Modes
    Linear Mode Linear Mode



    Similar Threads
    Topic Author Forum Replies Last Post
    1999 C230 Rust Problem jfallon W202 C-Class 7 11-11-2009 10:29 PM
    Need help with Rust Problem lfedje R/C107 SL/SLC Class 4 09-09-2008 04:23 PM
    1981 240D rust problem... labadida W123 E,CE,D,CD,TD,TE Class 0 09-14-2007 02:52 PM
    Spring Perch rust problem? Tacjam W210 E50 AMG, E55 AMG 2 12-05-2006 05:55 AM
    E300 Rust Problem tmerc65 W210 E-Class 1 06-24-2003 01:11 PM

    Posting Rules  
    You may post new threads
    You may post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are On
    Pingbacks are On
    Refbacks are On

     

    Title goes here

    close
    video goes here
    description goes here. Read Full Story
    For the best viewing experience please update your browser to Google Chrome