on some of the units I have worked on, there is a metal thermocouple that sits in the pilot flame, if its in good condition and hot enuf current flows to open the main gas valve when thermostat calls for heat
these can break down to the point that they don't have enuf oomph to open the gas valve, replacing the thermocouple usually fixes it, look for small metal line coming from the gas valve with other end sitting in pilot flame, kinda delicate buggers, sometimes you have to take them out and match them up to find one that fits
on newer units, there is an electric eye that looks for blue flame of main burner but your unit looks lot older than that
natural gas leaks or malfunction can maybe blow a house up, please be careful
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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