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pilot keeps going out

in Gas Heating
I've been working on a smith gb-100 boiler that the pilot keeps going out.I replaced the thermocouple twice and also the gas valve.The gas valve cured the problem for 24hrs then went out.The boiler is in a small room with less than adequate combustion air.I corrected that issue but I still have the problem and cranky customers.Any suggestions would be appreciated.Thank you.
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Comments
In my experience an intermittent pilot failure is usually caused by something wrong when the boiler fires. If it can't light off properly and rolls out, or it creates too much draft initially (rare) the pilot can go out. You just have to start eliminating possibilities one at a time. Start with checking draft under normal operating conditions as stated above, make sure there are not fans or anything running, make sure it is in spec there. Then do it again with all bathroom fans, clothes dryers, stove hoods etc, running and check it again. Still good? move on to the gas pressure. Make sure your mainfold pressure matches the rating plate, check your orifice size and make sure it is correct, check your inlet pressure (static and running), watch the pressure for awhile while it is firing to make sure the gas company's regulator is not wandering. So on and so on, and eventually you find the problem.