In Reply to: Paint? insulation spray> reroute? heat from manifold on 600 posted by Charles on April 20, 2020 at 17:40:00:
There is some real good insulation for fuel and brake lines that slips over the tubing. Here is one example. I use something similar on the fuel line on my 8N along with an aluminum heat shield I made to cover the exhaust manifold.
I have a friend who was given a 641 in sad shape. He brought it to me to get it running. The heat shield under the gas tank was rusted away and the fuel line was rubber hose around the back of the engine with an inline fuel filter and the hose was touching the exhaust manifold where it came around the corner from the back and headed for the carburetor. I replaced the heat shield under the gas tank with aluminum 0.120 thick so it could hold up to the vibration better. I looked at various ways to route the fuel line. I did not like any of the possibilities, but decided the way it was from the factory had to be the best. I made a new fuel line like the original except without the rubber section. I covered it with the braided insulation stuff. Then I mad an additional heat shield for the exhaust manifold with a "finger" which went down between the manifold and the fuel line. That tractor has been running for 3 years that way in Texas summer heat and not a single problem.