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Discussion Boards > Active Subjects > Messages as Posted > Tractor Engine Repair Rebuild Forum

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 09-09-2007, 12:36 Post: 145550
anocomp0219



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I just bought a Komatsu excavator small and it has a yanmar ed84-1fa engine. It will not start even with me spraying ether. any ideas?






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 09-09-2007, 14:56 Post: 145555
candoarms



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anocomp0219,

Since this machine is used, and you are unfamiliar with its history, I would highly suggest that you start from the beginning.

Let's assume that this machine hasn't been started for years.

1.Completely drain the old fuel and replace with a fresh couple of gallons. (Do not completely fill the tank, as you may have to drain it all out later.)

2. Check the fuel tank for rust and other debris.

3. Replace the fuel filter.

4. Disconnect and blow out the fuel line.

5. Check the injector pump to make sure that it's primed and is pumping fuel.

6. If your machine has glow plugs, make sure they're working properly.

7. Clean or replace the air filter and check the air intake for debris (mouse nest, for example.)

8. If the machine still doesn't start, even after all of this, I would suggest a compression test on the individual cylinders.....provided, of course, that you know fuel is getting delivered to the cylinders.

More than likely, the fuel in your system is just old and has turned waxy, which has plugged up the fuel filters. The other possibility is that your fuel has bacteria growing in it, which will cause the same problem. The resulting slime will completely plug your fuel filter.

Joel






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 09-09-2007, 15:39 Post: 145557
earthwrks

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Be sure the fuel cutoff solenoid is working too.

I bought a machine for pennies on a dollar because the former owner wired the ignition swicth to turn OFF the fuel pump while it was trying to start.

Always look for the not-so-obvious when it comes to used stuff.






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 09-09-2007, 15:46 Post: 145559
harvey



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 Spam Ignore

If it won't fire on ether it is a mechanical problem not fuel. It would not hurt to do all that other stuff also.

Does the valve train work? Remove valve cover watch the valves. Does it seem to have compression? Broken drive gear in the cam shaft/crankshaft timing train?

Even with a plugged intake or exaust enough ether should creep in to allow it to fire.






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 09-09-2007, 20:51 Post: 145563
anocomp0219



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Joel,

1-4 is OK

5 is a question. I dont know if it is primed enough. dont know how to do that? any suggestions?

6 N/A

7 OK

8 the guy I bought it off of had a compression test and it came up low.

I know that Im not getting enought fuel.

Thanks for the help. I apprieciate it.

Aaron






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 09-09-2007, 20:56 Post: 145565
anocomp0219



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Thanks I will check that.

Aaron






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 09-09-2007, 21:01 Post: 145566
anocomp0219



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Yes the valve is working but unsure if timing is correct.

does have compression dont know if it is enough.

Thanks for the sugestions been helpful.






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 09-09-2007, 21:01 Post: 145567
earthwrks

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Personally, I wouldn't waste any more time on trying to start it. I almost bought a dozer that did the same thing---PASSSSSSS!

You have basically figured it out: not enough compression to fire even with ether. Sounds like it's worn out and needs at the very least a ring job. Diesels are verrrrry expensive to rebuild ($3500-$5500 in my area) Of course no one can tell me why--as compared to a gas engine. Like Wendy's says "parts is parts"

You could likely buy new rings for about $200.

You might luck out and be able to drop a brand new engine in from a surplus supplier. There was one I dealt with and don't remember the name. If I do I reply back.

What did you pay for the machine? And what year and size is it?






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 09-09-2007, 21:03 Post: 145568
jd110_1963



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 Spam Ignore

Aaron, does the engine sound any different when you are spraying the ether in? Do you know how low the compression is? I have absolutely seen some of these engines get so low on compression that they won't start even with ether. If that is the case, the only solution is major overhaul. With that said, have you tried loosening any fuel lines at the injectors? You sould see a definite spurt of fuel every stroke if the pump is producing proper fuel pressure. If you are getting lots of white smoke while cranking, I'll bet the fuel system is OK and low compression is the culprit. Good Luck!






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 09-09-2007, 21:06 Post: 145569
anocomp0219



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Ok,

Does anyone have any suggestions on where I can get a repair manual on

Komatsu dc20-6
with a 3D 84-1FA

dont know the year

Have the shop manual but it really dont tell much.

Aaron






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Discussion Boards > Active Subjects > Messages as Posted > Tractor Engine Repair Rebuild Forum

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