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Old 07-15-2018, 07:14 PM   #1
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What Were They Thinking?

I just removed my spare tire mount from the rear bumper of my TR. It was corroded so badly in just a few short years. I believe it is caused by mounting a steel frame over the aluminum cladded bumper. Did they considered the effect of dissimilar metal when they decided where to mount the spare tire in the factory? I rather they put a good coat of paint on the bumper than have this silly checker plate.Click image for larger version

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Old 07-15-2018, 07:38 PM   #2
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Quote:
Originally Posted by Indiana View Post
I just removed my spare tire mount from the rear bumper of my TR. It was corroded so badly in just a few short years. I believe it is caused by mounting a steel frame over the aluminum cladded bumper. Did they considered the effect of dissimilar metal when they decided where to mount the spare tire in the factory? I rather they put a good coat of paint on the bumper than have this silly checker plate.Attachment 211093Attachment 211094
Our bumper is textured black, though the plate is also rusty. I touched it up while doing the rest of the frame.
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Old 07-15-2018, 07:58 PM   #3
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Quote:
Originally Posted by Indiana View Post
I just removed my spare tire mount from the rear bumper of my TR. It was corroded so badly in just a few short years. I believe it is caused by mounting a steel frame over the aluminum cladded bumper. Did they considered the effect of dissimilar metal when they decided where to mount the spare tire in the factory? I rather they put a good coat of paint on the bumper than have this silly checker plate.Attachment 211093Attachment 211094
I am confused. What is corroded so badly? I put a coat of rustoleum paint on the whole spare tire holder last year and itís all good. It was built in 2012.

Please explain how these 2 dissimilar metals can effect each other?
I havenít had any issues...see pictures.

Looks like any other metal piece that needs a coat of paint.

Best you direct you question to ORV and let the forum know what they say.
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Old 07-15-2018, 09:01 PM   #4
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I am confused. What is corroded so badly? I put a coat of rustoleum paint on the whole spare tire holder last year and itís all good. It was built in 2012.

Please explain how these 2 dissimilar metals can effect each other?
I havenít had any issues...see pictures.

Looks like any other metal piece that needs a coat of paint.

Best you direct you question to ORV and let the forum know what they say.
https://en.wikipedia.org/wiki/Galvan...on?wprov=sfla1

The link above would explain the dissimilar metal effect.

The Rust-Oleum paint you put on is a zinc rich based paint which would help protect your steel tire mount. To prevent this accelerated corrosion, these dissimilar metals should have been insulated from each other on assembly. A thin piece of nnoprene rubber wrapped over the aluminum plate might just do the trick.
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Old 07-15-2018, 09:42 PM   #5
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Originally Posted by Indiana View Post
https://en.wikipedia.org/wiki/Galvan...on?wprov=sfla1

The link above would explain the dissimilar metal effect.

The Rust-Oleum paint you put on is a zinc rich based paint which would help protect your steel tire mount. To prevent this accelerated corrosion, these dissimilar metals should have been insulated from each other on assembly. A thin piece of nnoprene rubber wrapped over the aluminum plate might just do the trick.
Thanks...still donít know what is corroded so badly....looks like good old rust to me but I didnít know about Galvanic reaction before.
Hope the U bolts didnít break...heard of a few failing.
Hope you use your fixes to prevents this from getting worse.
Let us know what ORV says please and with your suggestions.
Many thanks
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Old 07-16-2018, 08:42 AM   #6
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I had to go out and look at ours. It was built in Oct. 2010 and I don't have such rust or otherwise. I live in pretty dry climate. Accelerated by environment perhaps?
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Old 07-16-2018, 10:30 AM   #7
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Sure you have herd this before. "If it moves, salute it. If it doesn't, paint it.
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Old 07-16-2018, 10:37 AM   #8
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The problem is the paint they used to coat the tire carrier is junk or the metal wasn't prepared properly or a combination of both. The paint itself would keep galvanic reaction from happening because the metals do not touch each other. Salt and magchloride that they use on the roads in the winter is also a big problem. Clean off the rust and paint it with good paint. You could always put something between the carrier and the bumper if you wanted to. Just make sure it won't absorb/trap water.

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Old 07-16-2018, 10:45 AM   #9
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Remember, you are buying at a certain price point... so some things may not be the same as the other price points you can buy at .... compromises happen
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Old 07-16-2018, 11:51 AM   #10
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All I will say keep an eye on the u bolts, Mine broke at the corners where they make the bend. Was able to save it from falling off.
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Old 07-17-2018, 05:10 PM   #11
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All I will say keep an eye on the u bolts, Mine broke at the corners where they make the bend. Was able to save it from falling off.
X2. It would not be much fun watching your spare tire bouncing down the road behind you. We were one bolt shy of that happening during our first year of ownership. Failures are from stress fractures in the corners.

Bob
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Old 07-18-2018, 12:12 AM   #12
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X2. It would not be much fun watching your spare tire bouncing down the road behind you. We were one bolt shy of that happening during our first year of ownership. Failures are from stress fractures in the corners.

Bob
It looks like this failure is caused by having too sharp a radius at the corner. If the U bolt is manufaured by cold forming, the inside radius should be no less than 1x rod diameter. To match the sharp corners of the bumper tubing, they have to make the bend with a sharper radius. In a perfect world, this could be remedied by normalizing the material with heat treatment after the cold forming. However, when bean counters are calling the shots, this can be compromised to save a buck.
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Old 07-18-2018, 09:27 AM   #13
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I guess if it didn't fall off on the way to the dealer, it's good to go,,,,LOL.
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Old 07-18-2018, 04:05 PM   #14
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On my 2018 TR I notice the "U" bolts are different. Not a sharp 90 degree bend. I have not touched up any painted metal on the tire carrier. I have touched up the optional rear hitch and the 2"x 2" tubing the 4 corner stabilizers are mounted to.

Mine was a Sept 2017 built picked up in late October. At another dealer I notice some 2017's that were covered in undercarriage rust. Axles, frame... everything. I would never except a unit like that.
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