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Tractor Talk Discussion Forum

Injector line leak

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JD jim A

02-09-2005 17:02:14




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Posting this for a neighbor, he needs the tractor to clean barn, so it's kind of an emergency. He pulled the injectors out of his JD 4240 to have them checked. When he put them back in and got the tractor running, it had a heavy leak between one of the injector lines and the fitting at the top of the injector. I took a look at it, and I can't figure out how to get it to stop. It's almost like the flare at the end of the line doesn't line up to the injector, like the line is bent a tiny bit. I held the flare against it's seat as I tightened down the nut, which slowed the leak some, but did not stop it. We even removed the line and inspected both ends, they are clean and not damaged as far as I can tell. What are we missing? This is very fustrating. It has Bosch injectors, if that matters.

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T_Bone

02-09-2005 21:23:07




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 Re: Injector line leak in reply to JD jim A, 02-09-2005 17:02:14  
Hi Jim,

You can also over tighten a flare and cause the leak. The female flare is slightly under 37º so when it tightens it seals against the 37º male flare face.

Theres a high pressure sealer called 'Leak-Loc" thats rated for 500psi but I've used it for higher pressure with good results.

Replace the flare is the only correct fix tho.

T_Bone



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marlowe

02-09-2005 19:34:07




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 Re: Injector line leak in reply to JD jim A, 02-09-2005 17:02:14  
don't know about JD but massey have 2000 psi on the lines



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oldart

02-09-2005 19:21:43




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 Re: Injector line leak in reply to JD jim A, 02-09-2005 17:02:14  
look at the injector to see if the seat for the line is not dammaged even try putting it in a diffrent cylinder ot see if line or injector my help to find problem good luck art.



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JMS/MN

02-09-2005 18:51:03




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 Re: Injector line leak in reply to JD jim A, 02-09-2005 17:02:14  
I agree with the cracked idea. May look like a line, but so fine you can't catch a fingernail on it. Never tried repairing them- just put on a new one and was done with it. Also a good time to put on the rubber boots, if yours still has the plastic ones. They get brittle and crack with age. Put on the whole set- they're cheap, and then you don't get stuck out in the field when you really need the tractor.

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NC Wayne

02-09-2005 18:28:53




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 Re: Injector line leak in reply to JD jim A, 02-09-2005 17:02:14  
I agree with jdemaris, it sounds like a crack in the solder joint that only opens up when the joint is tight. It's a really common thing to happen.



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buickanddeere

02-09-2005 17:54:38




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 Re: Injector line leak in reply to JD jim A, 02-09-2005 17:02:14  
Please don't check for leaks with your fingers and stay back far enough to protect all other body parts as well. Sometimes the Dr's can't save the parts injected/pierced/cut with oil or other high pressure fluids. A real careful silver solver job might fill a flare crack but it's a long shot.



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jdemaris

02-09-2005 17:12:32




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 Re: Injector line leak in reply to JD jim A, 02-09-2005 17:02:14  
This is only a guess, but it sounds like the flare got cracked and it's barely visible - and opens up when you tighten the line.



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