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730D Fuel Injection Leak and Other questions

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Ted

06-06-2002 18:34:51




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My 730D has been leaking a small amount of fuel into the crankcase. Not a lot of fuel, but any is too much. It needed some valve work so while it was down for that I looked into the fuel leak. Injector lines and connections are good, but the brass packing washers in the fuel delivery valve housings (Scintilla pumps) had pitted back sides. I supposed this was the place it was leaking, so put in new washers. Now, the #1 side is not leaking, but #2 has a bad leak still. The fuel is coming out around the threads that screw into the larger nut that has the brass washer and valve in it. Is there something I should have done differently than just tighten everything down, or is there a certain way to seat the brass packing?

Also, is there oil from the crankcase under pressure that is fed to the pumps for lubrication to the speed control rods on the under side of the pumps? I ask because when the tractor is running and I was looking for fuel leaks, I could see a small amount of fluid coming from the area of the rods.(probably not the correct name for these, but I mean the rod that the governor acts against)

Thanks for any input here. Ted K.

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RLArmstrong

06-07-2002 04:46:35




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 Re: 730D Fuel Injection Leak and Other questions in reply to Ted, 06-06-2002 18:34:51  
Ted, Having gone thru a 730 that gains oil? You may have only touched the tip of the iceburg. It wouldn't hurt to have both pumps check & rebuilt, the fuel lines check & maybe evan replaced & might as well do the injectors. The shaft on the flow pump, look for a washed effect under the shaft? The manifold that the high pressure pumps mount to may also have a hair line crack internally. So what I am saying is I went thru the whole fuel system, befor I stopped all the fuel from leaking into the crankcase! But she purr's like a junk yard cat in high speed wash'en machine now! RLA

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