Rear crossmember sombrero mounts

[Gary B.]

In a 2006 article by John Hinkley in the Corvette Enthusiast, he mentions the use of an anti-seize compound to facilitate installation of the rear crossmember on the sombrero mounts. Does anyone have a recommendation for what anti-seize to use that is compatible with rubber?


Thanks,


Gary

[Joe L.]

Re: Rear crossmember sombrero mounts

Gary------


All anti-seize compounds I know of contain petroleum compounds. So, theoretically, there is some potential incompatibility with rubber. However, I don't think it would be an issue, at least for as long as any of us, at this point, are going to be using these cars.

[Dick W.]

Re: Rear crossmember sombrero mounts

In a 2006 article by John Hinkley in the Corvette Enthusiast, he mentions the use of an anti-seize compound to facilitate installation of the rear crossmember on the sombrero mounts. Does anyone have a recommendation for what anti-seize to use that is compatible with rubber?


Thanks,


Gary

Neverseize

[Gary B.]

Re: Rear crossmember sombrero mounts

Dick,

As in "Never-Seez 30840652 Regular Grade"?
Gary

[Gary B.]

Re: Rear crossmember sombrero mounts

Gary------


All anti-seize compounds I know of contain petroleum compounds. So, theoretically, there is some potential incompatibility with rubber. However, I don't think it would be an issue, at least for as long as any of us, at this point, are going to be using these cars.

Joe,

Yes, petroleum-based compounds and rubber incompatibility was my concern.

Gary

[Terry M.]

Re: Rear crossmember sombrero mounts

In a 2006 article by John Hinkley in the Corvette Enthusiast, he mentions the use of an anti-seize compound to facilitate installation of the rear crossmember on the sombrero mounts. Does anyone have a recommendation for what anti-seize to use that is compatible with rubber?


Thanks,


Gary

Try silicone grease. The lubricating kind works best, not the electrical insulating kind (called dielectric grease). I think the lubricating kind is commonly sold as Sil-glide.

[Joe L.]

Re: Rear crossmember sombrero mounts

Try silicone grease. The lubricating kind works best, not the electrical insulating kind (called dielectric grease). I think the lubricating kind is commonly sold as Sil-glide.

Terry-----


That's actually exactly what I used.

[Gary B.]

Re: Rear crossmember sombrero mounts

Thanks all.

Gary

[Jack J.]

Re: Rear crossmember sombrero mounts

Please correct me if I'm wrong, but aren't we talking about metal to metal contact and not rubber to metal contact. I don't understand how any petroleum grease product could possibly effect the rubber portion of the sombrero since it, (the grease), is used to facilitate ease of insertion and prevent rust buld-up between the two metal contact surfaces should the sombreros need to be changed out in the future which is probably unlikely.

[Gary B.]

Re: Rear crossmember sombrero mounts

Jack,

The metal (quasi-hemisphere) sombrero that is part of the frame inserts into the mating rubber bushing of the removable crossmember. That junction is a bear to get apart during dis-assembly. And presumably also harder to re-assemble w/o a lubricant. So, no it is not metal to metal.

Gary

[Duke W.]

Re: Rear crossmember sombrero mounts

Please correct me if I'm wrong, but aren't we talking about metal to metal contact and not rubber to metal contact. I don't understand how any petroleum grease product could possibly effect the rubber portion of the sombrero since it, (the grease), is used to facilitate ease of insertion and prevent rust buld-up between the two metal contact surfaces should the sombreros need to be changed out in the future which is probably unlikely.

The frame "pad" is steel and the cushion is rubber, so the interface is rubber/steel, and I agree that a thin film of silicone grease as mentioned above should be applied to both surfaces, which should keep them from seizing, and silicone based grease will not attack the rubber.

Duke

[Michael J.]

Re: Rear crossmember sombrero mounts

And make sure you put them in right side up......

[Jack J.]

Re: Rear crossmember sombrero mounts

Jack,

The metal (quasi-hemisphere) sombrero that is part of the frame inserts into the mating rubber bushing of the removable crossmember. That junction is a bear to get apart during dis-assembly. And presumably also harder to re-assemble w/o a lubricant. So, no it is not metal to metal.

Gary

Gary, thanks for the clarification. My reply was somewhat of a "senior moment". I was focused on the removal of the rubber bushing from the cross member. As I recall when I did mine the bushing's outer metal sleeve rusted/welded itself to the cross member's inner surface. Thanks again.