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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

John Deere 450LC Excavator engine

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JCSinGA

07-14-2007 11:37:03




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Hey Guys, I'm trying to start this 450 JD excavator that has been sitting 4+ years. I have fuel at the injectors but no start, far as that goes no smoke either. I removed the 3 easiest accessable injectors and as best I could squirted oil on the cylinder walls, made no difference whatsoever. I noticed that the tips of the injectors I removed were bone dry. Took 1 injector back out and took it to a pop tester at my local HD truck parts store and they had to plug the return hole of the injector for the tester to build any pressure. What fuel the tester was putting in the injector was immediately coming out the return hole. When the hole was plugged the injector popped at around 4500 psi.

I believe the injectors are bad, from my understanding only the amount of fuel that is not used during the injection comes back out the return hole and it only does that after it injects. Does seem odd that all 6 are bad tho. Can anyone offer other thoughts?

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AJK

07-14-2007 16:00:57




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 Re: John Deere 450LC Excavator engine in reply to JCSinGA, 07-14-2007 11:37:03  
Replacing the injectors should get you going,I have come across the problem more than once with injectors made under licence from Bosch usually in Jap made stuff,apparently there is a built in filter in the injector body,when it gets blocked the increase in fuel pressure ruptures the high pressure port into the return port,that is why you got fuel coming out the leak off when you tested them,they cannot be repaired as the body is scrap,you could save the nozzles,hope you get going ok,I have not see any pump damage as to date.
AJ

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Roy Suomi

07-14-2007 12:08:36




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 Re: John Deere 450LC Excavator engine in reply to JCSinGA, 07-14-2007 11:37:03  
It does seem strange all the injectors are bad at the same time..One would expect 1 or 2 maybe..I haven't been around the newer stuff at all..490-590 E series came out when I flew the coup.. Are the injectors the large bodied Bosch style ? or pencil injectors ?? I would assume they would be Bosch style...Plugging the return shouldn't be needed to test injectors..That is excess fuel leak-off only..I wouldn't think 4500 lbs of fuel pressure is needed to pop an injector..Maybe half that....I would send all the injectors to a pump rebuilder to have them checked or rebuilt first..They have to be right before it will run..

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JCSinGA

07-14-2007 14:55:44




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 Re: John Deere 450LC Excavator engine in reply to Roy Suomi, 07-14-2007 12:08:36  
Thanks for the reply Roy, I'll be working on it again Monday. They wanted it in Miami Fla. on Monday only about 1000 miles away from me.

It does have the big body Bosch inj. They are going after 6 new inj. at $150 each Monday morning, dang I hope I'm right.



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