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Anyone know 2-Cylinder injectors?

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Poor Farm Jim

01-20-2002 10:05:43

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A friend and I took his injectors from his 730D to a J.D. dealer to have them tested for spray pattern and cracking pressure. Spray pattern was fine but the cracking pressure on one was 2000 psi and the other about 2200 psi. Should be at least 2400 psi up to 2600 psi, correct? When he got home he dismantled both injectors and found the shim stack to be about 125 thousanths. He made a shim of 5 thousanths and put it in the weakest injector, installed them, and the tractor runs fine. Our question is - is there a rule of thumb for how much pressure increase you get for each thousanths of addition shim? Also, he thought that that was a lot of shim material, that perhaps the spring had gotten weaker over time and someone had kept adding shims to bring the cracking pressure back up. Should he be looking at replacing the pressure springs, or is this about a normal amount of shimming?

Poor Farm Jim

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Spokerd1

01-20-2002 11:39:29

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Re: Anyone know 2-Cylinder injectors? in reply to Poor Farm Jim, 01-20-2002 10:05:43

Mr. mrm can explain all there is to know about injectors for two cylinder John Deere's. Since he is the expert, he will not lead you astray. But it seems to works like this. The more shim you add, and it has to do with the spring tension inside the injector, will increase the lift pressure of the fuel valve inside the injector. The injection fuel pressure will build up inside the injector against the needle. When the pressure is great enough to override the spring, the needle raises,and chatters, and alows the fuel to spray out the nozzle. Some fuel that did not make it to the cylinder is sent to the fuel tank by the return lines, on the R it is returned into the air intake. Do not let the returns stop up. The injector will go into a Hydrolic lock and will not open, if the return is stopped up. I have seen .003 shim raise an injector 100 psi.That is if every thing in the injector is clean, no burrs or scratches. and the metering valve is not leaking past the needle. I hope this helps. The book does not give a chart or any info as to how much a .001 shim will raise the pressure in an injector. I work with Bendix Injectors which are about 75 x larger that the two cylinder injectors They also have to crack open at 2,300 to 2,600 psi. They are about 3 feet long and 1 1/4 inch in diameter. These injectors are used in a 16 cylinder 6,800 hp 480 RPM Enterprise Diesel. And they spray at 27* before TDC for max Hp. They work on the same principal and all the inter parts look almost the same. Except the John Deere injector parts are quite abit smaller in scale.

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mrm

01-20-2002 13:37:43

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Re: Re: Anyone know 2-Cylinder injectors? in reply to Spokerd1 , 01-20-2002 11:39:29

I'm not MR. Expert I'M MR.Been There Done That. It's not bragging if you can do it,and I can. I like to inform people based on real life things I've done and to keep them from makeing mistakes. I've made mistakes in the past,and one of them was thinking ADULTS used this site.

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