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Hard start

J

JHubnuts

Member
My 504 Diesel has a rough time starting. I warm up the glow plugs for about 10 sec. and hit the starter. She starts, but puffs smoke like hell,rpms decrease and she quits. By about the 3rd or 4th try the smoke clears up and she idles like normal.What gives? Could it be the fuel? I haven't put new fuel in it in about a year b/c i haven't used it enough to do so. I've been working on it since i got it in Aug. 2010. I replaced head gasket, glow plugs, filters, and all fluids except fuel shortly after i got it. only started smoking this spring.
Id appreciate any suggestions. Thanks. Jason
 
I am not sure of the time advised for GP use, but it is normally in the area of 50 to 70 seconds. Then they can be held on for longer after starting. (check this with the owners manual. Jim
 
Hold them for a minimum of 45 seconds and KEEP holding them while you are starting it. If it starts with only 10 seconds of holding them, it surely will start fine and clear up fine with the proper starting procedure. Hold them on while cranking, don't let go and then go back and hold them. It is a precombustion chamber style engine and they need the heat from those glow plugs until sufficient turbulence is built from the heat developed in the cyl. They use a low pressure injection nozzle and do not provide that break up of fuel like a direct injection engine does.
 
Man, if the tractor fires after only 10 seconds of glow plug use, you've got an EASY starting tractor there...
 
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