Posted by pete 23 on June 10, 2009 at 10:28:35 from (173.87.14.132):
In Reply to: 560 diesel pump posted by bornred on June 09, 2009 at 06:09:20:
What Chuck is talking about is the hydraulic head in the inj pump siezes (freezes) and the small diameter part of drive shaft breaks to help avoild farther damage to pump and or timing gears drive train. Ambient temp in itself has no effect on it,as all parts of pump are expanding and contracting in unison, just a sudden cooling of pump itself like cold water on it will cause head of pump to contract before cooling could effect rotor. My experience has always been if they do twist shaft, pump is also damaged. In about 1960, at a service training session, instructor removed the rotor from head of Roosa pump, held rotor in his hand, which he told us of course you never do, and while he continued to give information on pump, then he went to show us he could not put rotor back into head of pump due to expansion from heat in his hand. He then immersed both parts into diesel fuel, we took a lunch break and upon return, rotor slipped right back in. Very close tolerences on inj pumps. Not much room for error.
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