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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Hard Starting komatsu

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Rolls Royce

03-10-2007 19:04:18




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I have a d21-p5 dozer that i recently purchased .Although it seems that the glow plugs are working it takes forever to start when its below 40 degrees .I didnt get a owners manual i may be not following some starting procedure corectly.As it cranks I get heavy black smoke and if you werent careful you could burn up the starter,it might take 4 or5 minutes of cranking (in short sessions) It doesnt use a lot of oil or seem to have uneven compression and runs like a top once started.Thanks in advance for any help.

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AJK

03-12-2007 02:05:32




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 Re: Hard Starting komatsu in reply to Rolls Royce, 03-10-2007 19:04:18  
Check the air filter to see its not restricted,then remove the wire that goes on to the bus bar for the glow plugs,test that wire for power when the heat/start switch is in the heat position,take off the bus bar,you can now test each individual glow plug with a simple test lamp,put power to one lead and connect the other to the glow plug terminal,if the plug is good the lamp will light,you need all the plugs to be working,replace any that does not light the lamp.
AJ

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NC Wayne

03-10-2007 19:53:06




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 Re: Hard Starting komatsu in reply to Rolls Royce, 03-10-2007 19:04:18  
Heavy black smoke is typically indicitive of unburned fuel. If it belonged to one of my customers the first thing I'd do is check the glow plugs and make absolutely sure they are working. You should be able to pull them and hook them up and check them that way or if you've got an Ohm meter and a service manual often the manual will give you the Ohm reading for a good plug. If they all checked out OK then I'd check compression. If the compression was OK then the next thing would be to have the injectors checked. If the cylinders are too cold the fuel isn't gonna burn, if compression is low the fuel won't burn and if the injectors are squirting fuel instead of spraying it in an atomized mist it won't burn either. Any of these problems or combonation of problems has the potential to give you black smoke out the exhaust, especially on startup. Check all three and pray the problem is bad glow plugs or a bad injector/injectors and not low compression. Good luck.

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