Posted by Heat Houser on December 31, 2007 at 14:43:23 from (69.66.35.73):
In Reply to: 560 carb problems posted by 560 owner in KS on December 31, 2007 at 12:10:50:
Check to see if your heat riser is working. On the outside of the manifold should be a strip of bi-metal coiled up. (Maybe 5 turns coiled up) The outer end will be bent to form a hook which hooks over a 1/8 inch dowel that sticks out from the side of the exhaust manifold. The inner portion of the coil slides into a slot on the heat riser's shaft. The heat riser should move easily as it is the expansion of the bi-metal strip that opens or closes the heat riser. If you look on the backside of the manifold, you will find a cast arm which counterweights the heat riser. When closed, the heat riser directs exhaust gas thru a passageway in the intake manifold to preheat the intake air. This will help your carb icing but in the right conditions, it may still ice. To burn gasoline, it must first be vaporized. To turn a liquid into a vapor, it takes heat therefore the carb icing.
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