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Old 07-26-2012, 07:31 PM   #15
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Charles: today's trivia-- I was told long ago that diesel trucks and motorhomes have the air intake high to avoid fumes. If you draw gasoline fumes (fuel spill) into the diesel, it can cause a runaway engine with no way to secure it. (Block the intake with a rag was solution...Plan B was ..run...)

Thanks for the update- Your repair looks like it's going well. Checked my intake duct, a few small pinholes, will repair that before our next trip in August.
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Old 07-26-2012, 10:41 PM   #16
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Quote:
Originally Posted by wimberleyman View Post
Thanks for all the pictures Charlie. You put a lot of thought and work into that. I'll do something similar when I tackle mine (when it gets much cooler). One question. Is picture number 2 from the top looking down? If so, it looks like the top part is metal or some other type of rigid tube.

I'm sorry that picture #2 was at such a weird angle. It is actually looking forward, parallel to the frame rails. The muffler is just to the right of the picture. I was trying to do my best to show the pipe and where it connects to the 90 degree "el" than goes into the bottom of the air filter. Picture #5 shows that same pipe and how it is parallel to the muffler.

In the foreground of that picture is the metal tube. It is definitely heavy. When we first bought the RV, the tube just flopped up and down because its only connection was to the rubber el. I added a bracket to the bottom of the air filter mount which then gave me some place to connect metal straps which support it.

The former owner had overheating problems and had taken it to the Ft. Worth Freightliner dealer under warranty. I tried to get them to tell me exactly what they had done, working to Freightliner Custom Chassis to resolve that overheating. I've never had it. I suspect that there were changes to the intake area but have no evidence to support that.

Tomorrow, I'm going to put on the metal straps. I looked all around for some wide metal to spread the load of the straps on the rubber pipe. I finally decided on some dry wall corner bead which . I'm going to cut it to length which will be slightly longer than the circumference of pipe, flatten it and then put the band over it, fastening the two together with machine screws. It will end up about 2" wide which I'm satisfied with. Two of those should keep the new pipe in place on the roughest road. If I get a chance, I'll post of picture of one of them one I'm finished.
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Old 07-27-2012, 11:37 AM   #17
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When I rerouted/extended my engine air intake from under my coach up and out the side of the rear fiberglass cap, I used 6" galv heat duct and elbows.
All joints are secured with sheet metal screws, pop rivets, or worm gear hose clamps.
I sealed the joints and seams with foil, (NOT cloth), duct tape.
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Old 08-02-2012, 07:48 AM   #18
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Update: I took the MH out for it's annual inspection yesterday. The road there is about as rough as they come around here but everything stayed in place just as I set it up. There is always the chance that repeated bumps will knock something loose so I'll check periodically on our next trip.

I'm very happy to have the work done and a better solution in place.

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Old 08-03-2012, 02:06 PM   #19
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Charles; Just completed my repair . Removed the fabric intake duct, thousands of pin holes. Used 90 deg galvanized duct to join fabric and 6" rubber duct. (Added "wings" to bolt under the floor.) new support straps. The rubber duct from Rubber Specialties here was $6.50 a foot.
RFH | Hi-Tech Duravent - Flexible Hose and Ducting
Glad you noticed the problem early, there was not much dust or debris in the steel section of the intake. My air cleaner is due to be replaced next year, the filter minder still looks good..
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Old 08-20-2012, 09:01 AM   #20
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Your repair looks great, Hooligan. I'm not surprised that you found all of those holes. It sounds like my fabric had deteriorated more than yours because I also had the long holes where the inside spring was poking through.

We just finished a 3,200 mile trek to PA and back to Texas. The roads were worse than any test track that I could have imaged. My repairs held just as I had hoped.

I watched to see if the intake manifold temperature increased but didn't see any difference. It ran about the same as before and based on the outside temperature.
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