Watch the pilot and flame as it cycles on. If the pilot or flame blows around, gets drawn up off the burner, or tries to blow out, chances are there is a crack or hole burned/rusted through the exchanger.
If that has happened, time to retire it! Not only is it a fire hazard, it will leak carbon monoxide into the room.
If the exchanger checks out, like others have said, be sure there is sufficient heat getting to the thermocoupler. One word of caution, if you take the pilot assembly out for cleaning, don't enlarge the pilot jet while cleaning it! The hole is so tiny, running anything through it will result it the pilot burning too large, wasting gas, overheating the thermocoupler.
I have converted several over to intermittent pilot with this kit. Works well, no more pilot problems.
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Today's Featured Article - History of the Nuffield Tractor: Conclusion - by Anthony West. In the last piece I mentioned that Nuffield had reached the stage where they had chosen to drop the "Universal" from production. The two new models were given three figure numbers, instead of "three" and "four". Model numbers were introduced to help farmers and dealers instantly recognize the engine size and horsepower of the tractor, the 4/60 had a four cylinder diesel engine which developed 60 bhp at 2,000 rpm. The 3/42 had a 3 cylinder diesel engine which produced 42 bhp at 2,000 rpm. Th
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