Location: Cottage Grove, OR
(71.155.147.38) | Yes, Barney, stones can be a real problem.
In my coach, there is an aluminum pan that spans the space between the bottom of the radiator and the rear of the engine to prevent just that problem. There is also an aluminum pan on the outside of the right frame rail filling in the space under the battery and forward to the firewall.
Even with all of that, I still get some sand in that general area, but have not had a problem with stones. I have done some significant gravel road travel at speed in Mexico, California and South Dakota without problems.
I do recommend that if anyone's coach doesn not have such pans, that they have them fabricated to eliminate the problem that Barney has just exprienced. The pans also "collect the evidence" if you loose alternator cooling fins, belt shreds, and other misc. loose parts.
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Getting Stoned---
