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General Bobcat Skidsteer Forum
731with F2L511 Black smoke problems
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<blockquote data-quote="Tazza" data-source="post: 4217" data-attributes="member: 82"><p>So when you re-attached the trencher its still the same rite? puffing black smoke.</p><p>How did you re-prime the system? did you un-do the screw on the injector pump and operate the lift pump on the right side of the engine to get the fuel moving?</p><p>The other thing you may check is the excess fuel button, have a look on the injector pump, there is a small button that is used to feed the engine heaps of fuel for startup. Give it a bit of throttle and see if it clicks down, you will hear it click and it will sit lower than usual. When the machine starts it will pop back up, if there is a problem it *may* be staying in that position.</p><p>I have heard a horror story of someone re-priming their machine with a can of engine start, just kept giving it a snort until it had sucked up fuel.</p><p>The only other thing you could do is to pull the injectors out and do a compression test and maybe even check the injectors spray pattern to see if the nozzle is spraying correctly. Black smoke is generally excessive fuel, this could be because the injector isn't spraying a mist, but if you have filters no junk should have gotten through.</p><p>Let me know how things go, i have a 731 my self, its a great machine. The engine it has is great and was replaced just before i got it, it came with the old engine that i was told was lazy.</p></blockquote><p></p>
[QUOTE="Tazza, post: 4217, member: 82"] So when you re-attached the trencher its still the same rite? puffing black smoke. How did you re-prime the system? did you un-do the screw on the injector pump and operate the lift pump on the right side of the engine to get the fuel moving? The other thing you may check is the excess fuel button, have a look on the injector pump, there is a small button that is used to feed the engine heaps of fuel for startup. Give it a bit of throttle and see if it clicks down, you will hear it click and it will sit lower than usual. When the machine starts it will pop back up, if there is a problem it *may* be staying in that position. I have heard a horror story of someone re-priming their machine with a can of engine start, just kept giving it a snort until it had sucked up fuel. The only other thing you could do is to pull the injectors out and do a compression test and maybe even check the injectors spray pattern to see if the nozzle is spraying correctly. Black smoke is generally excessive fuel, this could be because the injector isn't spraying a mist, but if you have filters no junk should have gotten through. Let me know how things go, i have a 731 my self, its a great machine. The engine it has is great and was replaced just before i got it, it came with the old engine that i was told was lazy. [/QUOTE]
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731with F2L511 Black smoke problems
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