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How Do I Address Rust Spots Under the Hood?
Today I noticed for the first time some rust spots under the hood (specifically, on the long metal piece at the top of the engine compartment just above the fans). They look minor enough that what I intend to do is just scrape the spots down to bare metal and paint over it.
Is this "quick and dirty" approach fine? What kind of paint do I need to get? In a worst case scenario, if I have to replace this piece, what would it cost? Thanks!
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife Last edited by shertex; 02-06-2011 at 04:39 AM. |
#2
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If you're talking about the upper radiator support, it's welded in. Is this the 124 or the 126?
Clean it, put a good rust converter on it, if the metal is solid and only a cosmetic repair, no big deal.
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Gone to the dark side - Jeff |
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I pm'd you with secret information...
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/diesel-discussion/10414-help-i-need-check-stretch.html http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#4
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The 124, the 92 300D....I no longer have the 126.
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife |
#5
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You have a few options - one would be to grind it to good metal, use an etching zinc paint and then repaint. The other would be to use a por15 or eastwood rust encapsulator With some kind of sealant overtop like amsoil hd metal protector or Eastwood anti rust.
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Current Diesels: 1981 240D (73K) 1982 300CD (169k) 1985 190D (169k) 1991 350SD (113k) 1991 350SD (206k) 1991 300D (228k) 1993 300SD (291k) 1993 300D 2.5T (338k) 1996 Dodge Ram CTD (442k) 1996 Dodge Ram CTD (265k) Past Diesels: 1983 300D (228K) 1985 300D (233K) |
#6
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now, that's just rude....
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#7
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Sense of humor toggled off ? What kind of ' secret info ' could anyone have ?
I thought it was funny.... asked him for more info about his tools and weather where he was...
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#8
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Sense of humor toggled ON!
Sense of humor toggled ON!
I would say "Hello rust..."? Krown T40 is as good as it gets at preventing rust around here. I would hit it with T40 till better weather arrives.
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1999 Mercedes E300TD daily driver sold at 238K miles 106K miles were mine, rust worm got it :-( 2006 Mercedes CDI new daily driver! 56,000 miles May 2016 now 85,625 Apr 2018 and Apr 2019 101,000 miles Apr 2020 109,875. March 2024 135,250 |
#9
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vstech, leathermang is just trying to throw you off the scent. In fact, he sent me a secret forumla: you mix this stuff up in your garage....turns into a gas....you leave it in there with the car with the door closed for 12 hours....it seeks and destroys all areas of rust, restores metal to original condition, AND prevents new rust from forming for thirty years....GUARANTEED. You can see why it's secret information....wouldn't want this falling into the hands of BMW owners or something.
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife |
#10
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oh, that old stuff. got plenty of that in my mason jars at home.
after you are done mixing it up, be sure and add the sealer, or the extra will settle to the frame and it makes a racket!
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#11
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Quote:
If a topping is put on the rust, IMO the only option then is to grind it to clean metal. Something like krown that creeps will never get out of the rust formation enough to allow a rust stpping product to properly impregnate.
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Current Diesels: 1981 240D (73K) 1982 300CD (169k) 1985 190D (169k) 1991 350SD (113k) 1991 350SD (206k) 1991 300D (228k) 1993 300SD (291k) 1993 300D 2.5T (338k) 1996 Dodge Ram CTD (442k) 1996 Dodge Ram CTD (265k) Past Diesels: 1983 300D (228K) 1985 300D (233K) |
#12
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agreed. krown will stop it where it is, but you'll never be able to paint it again without serious cleaning. not really suitable for painted surfaces, I'd only use that on subframe/suspension stuff. keep the painted surfaces prepped, and treated with encapsulator!
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#13
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FWIW, People fighting rust on old (70s era unibody rust crumbling) Datsun Zs use POR15. Did I mention that a Z is never rust free - not even mine?
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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do. |
#14
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Quote:
which might indicate the need for sand blasting ..or chemical cleaning... but grinding would have to take an unnecessary amount of good metal off to be sure it was actually clean... so for our old cars a combo of less brutal ..but also cleaner ( at the metal surface.. not cleaner for the applicator --YOU--- wear protective clothing when called for ) methods is often called for.. If the temperature AND humidity ( meaning some is needed ) are correct then POR15 is a long proven product... BUT one MUST READ AND FOLLOW THE DIRECTIONS FOR IT TO BE EFFECTIVE... The harder/tougher the stuff you are applying to the metal the more important it is to do a great job of PREP... getting something like POR15 off an item which it really did not adhere to WELL .. was not doing what you needed it to do... is a REAL serious PROBLEM...
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#15
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Quote:
It is always a case by case basis... But prep is always key. I'm not keen on taking for chance an isolation/prevention of rust if I can help it. Sometimes this may mean a bit more aggressive practices, though hopefully not...
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Current Diesels: 1981 240D (73K) 1982 300CD (169k) 1985 190D (169k) 1991 350SD (113k) 1991 350SD (206k) 1991 300D (228k) 1993 300SD (291k) 1993 300D 2.5T (338k) 1996 Dodge Ram CTD (442k) 1996 Dodge Ram CTD (265k) Past Diesels: 1983 300D (228K) 1985 300D (233K) |
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