02-22-2021, 05:14 PM
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#1
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Check for rust around the radiator support member
Took off the skid plate today while getting ready to do an oil change and noticed some rust on the radiator support member. Looked closer and once I peeled the flimsy foam piece they put on there for what I'm guessing are sound proofing purposes (prevent skid plate from making contact?), I found quite a bit of rust! I ripped that foam piece off, it was wet and apparently has been trapping water and whatever else got in there. Wire brushing and Rust-Oleum is on the agenda for tomorrow. My 4runner is a 2016, and aside from this rust-free, some minor surface stuff here and there notwithstanding. It's far from neglected as every time it sees road salt I get a hose to the undercarriage first chance I get.
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Last edited by bglfgd; 02-22-2021 at 06:55 PM.
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02-22-2021, 05:33 PM
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#2
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Join Date: Sep 2019
Location: Minneapolis, MN
Posts: 113
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If you can, take off your rear bumper and check the frame. There is another foam piece (I believe for the bumper to sit on). I had a ton of rust under it myself after 7+ years, most that is on the truck.
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2013 Classic Silver TE w/ KDSS - 125k miles
Raptor lined bumpers, fender flares, valences, badges | Goose gear plate | Sound deadening | Hood scoop delete | Tundra fogs | H9 + 9011 bulbs | RCI Skids | Dobinsons C59-300 and C59-599 | Ironman UCAs | 285/70/17 Maxxis Razr ATs
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02-22-2021, 06:40 PM
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#3
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Quote:
Originally Posted by JeuTheIdit
If you can, take off your rear bumper and check the frame. There is another foam piece (I believe for the bumper to sit on). I had a ton of rust under it myself after 7+ years, most that is on the truck.
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Thanks for the heads up, adding this to the list.
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02-22-2021, 06:41 PM
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#4
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Join Date: Jul 2020
Location: CA
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When I changed out the front skid plate, I ripped off that foam piece for this exact reason. Whatever purpose it served/serves, is outweighed by the potential of trapping moisture and promoting rust.
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02-22-2021, 10:19 PM
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#5
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Join Date: Mar 2015
Location: Kansas City
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Same issue for me, I ripped it all out and wire brushed and painted. I’ll be pulling both bumpers and cleaning and inspecting and coating all parts that aren’t easy to clean with cosmoline. No other rust on my 17.
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03-26-2021, 01:52 PM
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#6
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Adding on to this, after seeing another post about rust under the rear gate's weather stripping, I pulled it today and that's what I found.
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03-26-2021, 02:21 PM
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#7
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Join Date: Aug 2018
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Quote:
Originally Posted by bglfgd
Adding on to this, after seeing another post about rust under the rear gate's weather stripping, I pulled it today and that's what I found.
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The back window rolling down is something I could do without, especially if I lived where the gov spread corrosives on all the roads in winter.
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1973 Datsun 240z (traded in for ---->) 1981 Toyota 4x4 Deluxe LB (avatar) stolen while sitting with For Sale sign on it / 1987 Chevrolet Suburban 4x4, workhorse - sold / 1984 Buick Grand National - Totaled, rear-ended / 1986 Buick Grand National - Sold then restified, lives in SF now / 1994 Toyota Camry - 240k - Taken to Austin Tx by son, traded in on VW GTI sport / 2001 Ford Excursion 7.3 212k - still pulling Arctic Fox Trailer - This is the shtf vehicle / 2018 Toyota 4runner TRD Pro Cavalry Blue
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03-26-2021, 09:13 PM
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#8
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Join Date: Feb 2020
Location: Snohomish, WA
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It will rust no matter what
This pic was taken with <1K miles on my 2020 ORP. I painted it black with enamel when installing the skid plate.
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03-27-2021, 03:51 AM
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#9
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Join Date: Sep 2006
Location: Omaha
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Quote:
Originally Posted by numbay
This pic was taken with <1K miles on my 2020 ORP. I painted it black with enamel when installing the skid plate.
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I dunno what to tell you man, this looks like textbook 4runner AIDS. Frame will probably be rotted out within 6 months. Sorry bro.
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03-27-2021, 04:24 AM
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#10
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Quote:
Originally Posted by numbay
This pic was taken with <1K miles on my 2020 ORP. I painted it black with enamel when installing the skid plate.
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That's normal surface rust those parts where bare steel the day our friends in Japan set forth your 4runner in to this mortal coil. The bolts are galvanized and the other stuff is aluminum. It's normal. Decay is a part of life, embrace it. I have a good example sitting here on my bench... the new one will rust as soon as I put it on the truck. Just think of it as wabi-sabi, not rust.
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03-27-2021, 04:39 AM
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#11
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Join Date: Jul 2018
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Quote:
Originally Posted by numbay
This pic was taken with <1K miles on my 2020 ORP. I painted it black with enamel when installing the skid plate.
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That's surface rust. Guessing they mill the parts after finishing? Ugly but doesn't require the attention of rust in a split seam or on the frame.
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03-27-2021, 10:41 PM
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#12
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Join Date: Feb 2020
Location: Snohomish, WA
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Quote:
Originally Posted by repo
That's normal surface rust those parts where bare steel the day our friends in Japan set forth your 4runner in to this mortal coil. The bolts are galvanized and the other stuff is aluminum. It's normal. Decay is a part of life, embrace it. I have a good example sitting here on my bench... the new one will rust as soon as I put it on the truck. Just think of it as wabi-sabi, not rust.
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You are so right--its part of life. I am not complaining, but just sharing my observation.
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03-28-2021, 05:32 PM
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#13
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Yesterday afternoon I spray the insides of my frame, front to back, with CRC HD Corrosion Inhibitor. The stuff is apparently kind of like liquid cosmoline that dries to a tacky finish and is hard to get off without solvents. The 4R is a month old and hasn't seen any salt. Looks like I'll be doing the outside of the frame as well.
/ garage smells like a crateful of Mosin-Nagants now
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03-29-2021, 12:11 PM
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#14
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Location: Indiana
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I replied to a thread a while back about common spots where rust will form. In the interest of helping others, I'll recap the areas where I have noticed rust form on my 2015.
1. At the rear hatch plastic hand holds to shut the tailgate. I have a small amount of rust forming, likely from the plastic hand holds rubbing off the paint.
2. At my drivers side headlight. Light wasn't fit perfectly and rubbed off the paint, therefore, its rusty.
3. At the rear spoiler, again, poor fitment lead to plastic parts rubbing the paint off the metal parts.
I remember seeing others point out the rust forming under the weather stripping at the tailgate and also under the plastic molding at the door sills.
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