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70D pumps and injectors into a 730D?

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Ted K

03-12-2003 07:27:28




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My 730D pumps were leaking really badly and the injectors were not up to snuff either. My neighbor had a 70D which ran really good, but had a loose flywheel and some tranny/pto problems, so he knocked it in the head and parted it out. The pumps and injectors were gone through about two years before he parked it. I traded him some labor for the pumps and injectors, and put them in my 730. Had to use the 730 pump mounting bracket, of course, because of the return line coming out the top. Now my tractor starts and pulls well (hardest work it ever does is grinding feed once in a while, otherwise just chores) but it has more black smoke than before. I read on a thread here from a year or more ago that the 70D injectors were a bit different but will work, but that efficiency may be a bit less. My question is, will it harm the engine to run it this way, or would I be better off to get 730 tips for the injectors?

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Clooney

03-12-2003 09:45:49




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 Re: 70D pumps and injectors into a 730D? in reply to Ted K, 03-12-2003 07:27:28  
Ted, the spray pattern should match the pistons. You should probably at least install the correct injector nozzles for you engine/pistons. ~Any idea where the rack was set when you installed the new pumps.
~Did you remove the pumps from the fuel rail before you found that you needed the new fuel rail? If so the fuel rail & pumps should be sent out & calibrated as a unit.



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Ted K

03-12-2003 11:30:35




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 Re: Re: 70D pumps and injectors into a 730D? in reply to Clooney, 03-12-2003 09:45:49  
Clooney-Glad you answered. The pumps were calibrated to both read 12-12 1/2 as they were installed on the 70D in the wide open position of the throttle lever, and stayed the same as it was pulled back to the slow idle position. I checked that before we took anything apart. The fuel rails were the same EXCEPT the 70D did not have the place for the return fuel to go back to the fitting by the fuel strainer via the little pipe, so that's why we had to retain the 730 fuel rail. I then set the pump injection timing and rack settings according to the book for the 730D (and so they were in sync. as they were on the 70) and the thing runs better than it has for several of the last 30 years we have had it. I need it for daily chores for the next couple weeks while I go through my 4020D, then I will be able to switch nozzle tips. What will the effects on the engine be running the wrong tips for a bit, or just not the power it should have? Thanks much, I appreciate it. Ted

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Gpower

03-12-2003 15:53:54




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 Re: Re: Re: 70D pumps and injectors into a 730D? in reply to Ted K, 03-12-2003 11:30:35  
Ted, the 70 tips are 160 degree angle of spray pattern, and have 5 holes in the tips of .010 thousanths, the 730 tips have 6 holes each, spray pattern of 140 degree angle with .010 thousanth holes. Also the 70 pumps has 10mm pumps, while the 730 had 13mm( if I remember right)they may be 10's. Anyhow the reason for the extra black smoke is due to the rack setting, or gov sto linkage. You shouldnt be hurting anything with the extra smoke, the tips are not matching the bowl on the piston very well, and this could give you some smoke problem, but not likely. Anyhow, hope this helps, Gpower

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JDGnut

03-12-2003 22:27:09




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 Re: Re: Re: Re: 70D pumps and injectors into a 730D? in reply to Gpower, 03-12-2003 15:53:54  
Like Gpower said.. you are installing the smaller 10mm pumps..(out of the 70D)... the 730's had the 13mm pumps.. Need to check the part numbers on the tips of the injectors to get the correct angled tips to match the pistons.. but its not really going to hurt anything.. just might get a little cleaner burn.. (but smoke can be good.. haha.)Maybe Gpower will throw out the numbers that should be on the tips???? JDGnut

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Ted K

03-13-2003 07:42:27




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 Re: Re: Re: Re: Re: 70D pumps and injectors into a 730D? in reply to JDGnut, 03-12-2003 22:27:09  
Thanks! I checked with Deere and can get the correct tips, but the mechanic who works on these old tractors said he'd just leave them as they are and enjoy not spending any more $$$ on it until it needs it. I'll see how it does seeding and cutting hay, then decide if they need changing. Appreciate the info. Ted



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