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 - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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