Posted by pete 23 on March 08, 2015 at 10:32:15 from (50.33.21.76):
In Reply to: 656D Injector or valve? posted by Montanarancher on March 08, 2015 at 08:35:41:
I would say the automatic load advance is not adjusted properly. You need to put a window on the timing cover and watch that timing mark when engine is running. The mark should move down two marks at all running speeds with no load. It is designed to retard one mark under half load and retard two marks back to starting point under full load thus the name load advance. Really it needs to be on a dynamometer to make the adjustments correctly but I have adjusted many without dyno. Just rap the throttle from low speed to wide open and the advance should rock back about one mark. Late timing will often sound like one cyl is miss firing. Have had a lot of customers pull a set of injection nozzles and bring them in for repair when this happens. Then I go out and set the advance. I have also set some without even having a window but then I know how they should sound when working correctly. Many repaired or rebuild pumps are not set correctly. One reason is they use calibrating oil and not diesel fuel so viscosity may be different. If this happens to be a hydrostatic drive or very very early 656 this information does not apply completely as they use a speed advance pump. Still needs adjustments but different procedure.
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