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twsutt

Aluminum Radiator Isolation

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I've noticed that many of you have stated that an all aluminum radiator needs to be isolated from the radiator support to prevent galvanic corrosion. I've purchased a direct fit aluminum radiator (similar to what MSA sells), and I would like to see how some of you have mounted your radiators so that it's not grounded directly to the radiator support. I've seen mention of plastic sleeves and rubber and I would also be interested in knowing where these can be purchased.

Thank you,

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I ran to the junkyard and pulled the isolation mounts off a 95 Nissan Pathfinders V6 air box and used those. Each truck only has 3 so you will have to hit up at least a couple to find some good ones.

The windshield wiper motor mounts are similar and can be made to work.

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I just used some common rubber bushings of the appropriate size. I believe it was John Coffey who said the main point of using rubber isolators is to protect the aluminum radiator from radiator core support flex which will destroy the radiator.

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I ran to the junkyard and pulled the isolation mounts off a 95 Nissan Pathfinders V6 air box and used those. Each truck only has 3 so you will have to hit up at least a couple to find some good ones.

The windshield wiper motor mounts are similar and can be made to work.

hogie,

Forgive me for being dense, but I haven't removed my old radiator yet, will the radiator support need to be drilled to fit the shoulder washers through or is the existing hole large enough?

shoulder_washer.gif

I assume that you used these along with the rubber spacer, otherwise the radiator will still be grounded to the frame through the bolt.

Edited by twsutt

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I didnt use the shoulder washers as they were too deep at first. They will need to be ground down a little bit in order to fit properly. I will probably get these added back on tonight.

As it is right now the rubber is wider than the bolt head/washer so the bolt only squeezes on rubber and doesnt touch any metal.

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Nope, it is a solid rubber bushing...kind shape like this. [=] the bolt goes through the equal sign so no metal on metal touching the radiator.

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Got it. Thank you. something like this:

t_rubber_grommets_big.jpg

I thought that it was just a rubber spacer.

I was looking at my Z last night and noticed that the four bolts that hold the radiator to the radiator support also hold the a/c condenser on the front side of the support. Do you have a/c in your car and if so will the rubber grommet fit through the support and condenser mounting tab together?

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The isolator is basically like those grommets, just thicker and has the metal sleeves.

I have an a/c kit in the attic, but have never checked to see if it would install in this manner.

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Okay. Like a smaller version of the suspension bushings.

Thanks for all your assistance. I'll be tackling this job this weekend...if the radiator arrives (and in one piece) this Friday like FedEx says it will.

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Terrence, the pics you posted are not what he means.

Those are a type of firewall grommet you have there .

He's meaning ones at least 1/2'' thick with a metal

sleeve to prevent crushing , allowing the rubber ends

to separate whatever you want to isolate from each other.:)

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I will try to post up a pic later on tonight.

"A picture is worth a thousand words."

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Lord Mount (Vibration Damping Mount). http://www.mcmaster.com part number 9376K221 Rubber.

John Coffey,

This is a beautiful thing. I can't thank you enough. At 3/4" spacing there should still be room to use the original fan and shroud.

I will name my next child after you.

Thank you,

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Wouldnt that thick of a spacing put your radiator in contact with the fan? With the mechanical fan and MSA radiaotor I was too close for comfort. Though part of that was they used the wrong radiator frame, which caused me to spend even more money on the dual fan shroud too!

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here is a pic of what I used. I cut the inserts down to 8mm to help center the bolts in the radiator mounting holes on the core support. That also helped keep me from over tightening and cutting the rubber.

rubberinsulator.jpg

Edited by hogie

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Hogie,

I'm still not sure that I understand how you've got this mounted that completely isolates the radiator from the radiator support. Isn't the metal from the bolt still in contact with both the support and the radiator with the rubber bushing sandwiched in between? If that's the case then the radiator will be cushioned from any radiator support flexing, but the radiator is still grounded to to the car through the 8M bolt, right?

I'm sorry to be difficult, I'm just trying to find the best/easiest way to mount an aluminum radiator that will prevent any contact that could carry an electrical current, and prevent any unwanted galvanic corrosion that could shorten the radiator's life.

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The rubber sleeve fits inside of the radiator mounting hole. The bolt is touching metal on the core support side, but since the rubber sleeve is the only thing contacting the radiator there is no metal to metal contact.

See where the gap is in the rubber, the radiator mounting tab sits there. So when you tighten down the nut it squeezes on the sleeve to the bolt head and the radiator just sees rubber.

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Got it. I was thinking that the radiator had a nut welded to the top mounting tabs like the OEM radiator. I haven't got my new radiator yet (be here tomorrow), but the picture on the website (GenesisAutoParts.com) shows that the mounting is the same as the OEM radiator.

See my confusion.

I prefer the clearance that these bushings provide.

Is the bolt hole in the radiator support large enough to place that bushing through it?

Edited by twsutt
added question

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I think I was able to squeeze the bushing through the radiator support when I was planning on mounting everything up. My factory radiator had holes just like the Champion radiator...so whatever nuts may have been welded on were long gone.

Either way it was easier for me to put the rubber on the radiator.

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hogie-

thanks for all of your help.

I'll try to post my results after I complete the install this weekend.

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You don't need a high temp silicone for a radiator mount. And if the radiator is too close to the fan you can carefully bend the mounting flange to move the radiator closer to the core support. This isn't rocket science.

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When I ran into my problems with the radiator being too close to the fan it was the manufacturers fault. The mounting flange was flush with the core support and couldn't be moved away at all.

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