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I also replaced the plywood covering the top of the engine compartment. It had a lot of rot, I suppose due to years of the Cruisair evaporator freezing and then melting everywhere. No other signs of water penetration back there. I replaced the fiberglass insulation and what I guess is meant as a vapor barrier, using foam board and a nice, thick pond liner. It turned out nice.
In order to get down to bare metal, I had to disassemble the engine air box that runs the width of the bus. Many of the screws holding the interior wood covering to the bus were installed from the outside, and then the air box covered the screw heads. That meant the coolant reservoir and oil tank had to come out. Of course, that was the perfect time to soda blast and repaint all of the sheet metal of the air box. And the oil tank. And the coolant tank. I actually finished that job last summer, and forgot about all of that work until just now.
1984 96" with 8V92TA
(remodeled Liberty Coach)
Greenwood, MO