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#1
08-28-2007, 12:53 AM
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Keep the rocker from rusting - how?
6 weeks ago I had no Mercedes - now I have 2. I decided that the 72 280SE 4.5 is too rusty and has too few cylinders with full compression to tackle it myself. So I looked for a less problematic vehicle in the vicinity - and found a 1970 280SEL with a full history for the first 25 years of its life and very minimal rust issues anywhere. The trunk looks like new.
After the purchase I spent a long time inspecting the body and found a single area that I want to work on: the rocker panel on the passenger side. The rubber moulding that is normally glued on had lost contact a while ago, and there was rust underneath. Including a hole about the size of the tip of a match. Same in the wheel well in the front: the undercoating has come loose, and there is a tiny hole into the rocker. The rest of the body is rock solid, including the jack points. If I let this go, in 3 years this will be much worse. So what to I do? Is there a way of sealing a (probably already slightly rusty) hollow space from the inside using something like POR-15? If so, how do I go about this? Enlarge the hole from the well so that I can get loose rust out and a brush in? Has anybody done this? Thanks for any advise! Dietrich By the way: The green 280SE 4.5 is for sale! 
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#2
08-28-2007, 01:05 AM
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#3
08-28-2007, 06:17 AM
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Quote:
But I read that as a product for new cars. Does it also work to arrest existing corrosion? I'd hate to trap it and think I stopped the rust, only to have it continue..... My Uncle in Penna uses a pressurized bug sprayer and sprays his used diesel oil into his rockers. Been doing it since the sixties and I have not seen a rotted out rocker on his cars yet. Fenders, yes, but not rockers..... Jim
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14 E250 BlueTEC black. 45k miles 95 E320 Cabriolet Emerald green 66k miles 94 E320 Cabriolet Emerald green 152k miles 85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles
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#4
08-28-2007, 08:01 AM
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Also, http://www.por15.com/
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#5
08-28-2007, 08:29 AM
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Waxoyl is commonly used on old cars as well. Another product that may be worthwhile is Fluid Film. Mercedes used a variant of these in the rockers of the W123s, and perhaps in your car as well.
If it were me, I would find or make an inconspicuous inspection hole in the wheelwell end of the rocker and see what is going on inside. If you can get in there and the rocker is just painted (not full of undercoat ) I would use phosphoric acid followed by POR 15 . If not, just some waxy-type stuff and keep it dry. Rick
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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)
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