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All 4840 injection pump experts please rise!

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scottAR

11-03-2002 18:25:37

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I have an early serial 4840 that is missing on one cylinder. It is identified by loosening an injector line on that cylinder and the engine does not change tunes. Lots of fuel delivery at the injector when loose. I tested the injector and it leaked some but was not all that bad but I got a rebuilt one to replace it. Still misses. Took off the valve covers and checked the whole valve train for looseness and clearances. Still misses. Had one man tell me that one of the plungers in the pump was "out of line" or worn out. Is this something a "shade tree" mechanic like myself can replace or is my only choice taking the pump to a shop? Or do you know of some other problem the engine may have? Thanks

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thanks guys-scottAR

11-04-2002 17:30:11

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Re: All 4840 injection pump experts please rise! in reply to scottAR, 11-03-2002 18:25:37

I will have to try this on my own. Maybe I will luck out and get it running smooth. It's 100 miles to a pump shop and the last Robert Bosch I took there cost me $963 to get it home and that's been several years ago. Thanks a million!

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G-MAN

11-05-2002 10:58:44

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Re: Re: All 4840 injection pump experts please rise! in reply to thanks guys-scottAR, 11-04-2002 17:30:11

Scott, injection work is not cheap, and it's one of those situations where you're paying for somebody else's experience, skills, tools and in a lot of cases, certification. Most dealerships don't do much if any pump work anymore, especially on new tractors where the work must be performed by an authorized service center. Definitely get ahold of the proper service manual for the pump you are repairing, and I wouldn't be above calling the pump shop to find out any particular things you need to look out for. Inline injection pumps are one of those items where there usually isn't a "good enough". Things usually need to be dead on for everything to work correctly. They're considerably more complicated and touchy than the old Roosa-Master rotaries. Good luck.

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Gary McKenzie

11-04-2002 06:49:05

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Re: All 4840 injection pump experts please rise! in reply to scottAR, 11-03-2002 18:25:37

The injection pump should be an in-line Bosch, there is a copper washer under the delivery valve holder in the pump that is cracked. The pump will still deliver fuel but cannot generate enough pressure to open the injector nozzle. This can be repaired w/o removing the pump but you will need a special socket to remove the holder and re-torque it properly. E-mail if I can help you further.

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John M

11-04-2002 17:26:31

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Re: Re: All 4840 injection pump experts please rise! in reply to Gary McKenzie, 11-04-2002 06:49:05

Gary, were the delivery valve gskt\washer blown, Scott would not have noticed such a large amount of fuel delivery when injector line was loosened. To check delivery valve washers, remove inj line from pump and pump fuel primer. If you see fuel building up or filling delivery valve holder, washer is bad.

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WTW

11-04-2002 10:28:58

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Re: Re: All 4840 injection pump experts please rise! in reply to Gary McKenzie, 11-04-2002 06:49:05

The 4840 has an inline "P" series pump. The repair that you discribe will apply to an inline "A" series like the 46 and 4440 used. The problem may be as you stated but will not be repaired corectly on the tractor as the "P" pump calibration will be affected to service the pump delivery valve seat gasket. Take this one to the pump shop so it can be calibrated after repair.

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G-MAN

11-04-2002 10:45:44

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Re: Re: Re: All 4840 injection pump experts please rise! in reply to WTW, 11-04-2002 10:28:58

Good call WTW. I recently had to replace a delivery valve in a pump on the tractor, and it was kind of dicey. The injection line nut was badly rusted on, and the fitting was damaged when I removed it. The guy didn't want to pull the pump, so I did it on the tractor. Our fuel system shop we do business with provided the parts and installation instructions, and it worked out pretty good and the tractor ran alright, but it still would have been best to send the pump in.

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John M

11-03-2002 21:04:00

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Re: All 4840 injection pump experts please rise! in reply to scottAR, 11-03-2002 18:25:37

Remove inj. line and reinstall so fuel injector can be connected outside of eng. BE CARFUL, FUEL CAN PENETRATE SKIN. Start eng and watch injector spray pattern. If inj. does not spray, pump is bad. If inj has a good spray pattern, you have a compression problem. You might try blowing in inj hole at cyl head with piston on compression stroke(both valves closed) with a rubber tipped air gun, and listen at eng oil filler, exhaust, or air cleaner to determine source of comp leak.(oil fill cap off and air filters removed.

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