Posted by gtx1967jewison on October 09, 2012 at 15:37:08 from (174.253.128.231):
In Reply to: Re: R adjusting rack posted by DGK on October 08, 2012 at 17:39:59:
Yes a lower setting lowers the point of Max fuel output. At any load less than that you've changed nothing. The rack moves back & forth with the throttle lever, which rotates the slotted inlet openings on the pumps, creating a larger or smaller opening & thus fuel amount to be sent to the injector. The governor acts against the throttle lever, keeping the rack from opening too far which would overspeed the engine. As load increases & engine rpm drops, the governor gets weaker so the throttle lever wins, pulling the rack farther open. The setting of 8 or 10 is only the maximum opening position, it does not affect fuel delivery at any speed/load below Max. At idle the rack is at a very small position, maybe 0.5 or 1 for example. So the smoke is NOT an excess fuel issue. More fuel at idle simply speeds up the engine. That's how you throttle a diesel- as I said, I'm 99% sure the timing needs to be somewhere other than at the are setting.
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