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Super MD injector pump problems

A

Anonymous-0

Well-known Member
Hi all, I have a SMD that is giving me a fit! Bought this tractor after it had sat for about 4 years, changed filters, cleaned tank and replaced with clean fuel and she fired right up. Tractor ran good in gas side and desiel pressure gauge came up to operating pressure and would switch over to desiel and ideal fine. Once you put the tractor under any load it would smoke like a freight train and bog down, so I pulled the injectors which were badly clogged and had them rebuilt. After installing the injectors now I cant get it to switch to desiel at all. I cracked open and bleed the injectors but got very little fuel. Am i missing somthing in the bleeding process? Had a local desiel mech. to look at it and he said the pump was bad but I cant see that when before the injector rebuild I had good pressure and could aleast get switched over to deseil, Any help would be much appreciated. There dosent seem to many modern desiel mechanics that understand these old machines.


Thanks Eric fox
 
Eric as your tractor is running on the gas side you have to move your diesel lever up to activate or turn on the pump so it will pressure up and then you can bleed the system and Injectors.
 
If I am getting pressure to the gauge should I still bleed the whole system or go straight for the injectors?
 
I don't know a whole lot about these tractors, but I would repeat the whole bleeding process according to the manual. HOpe to get my MD running in 2-3 months and will need to go thru this procedure.
 
(quoted from post at 18:52:44 04/28/10) If I am getting pressure to the gauge should I still bleed the whole system or go straight for the injectors?
Click to expand...

More than likely some crud is sticking the plunger or the rack isn't moving well. Also one or more of the distributor valves may be stuck. One being open will take down the entire system. And people who quote "bad pump" tick me off.

These rarely require bleeding, except for filters. Even those will generally fill just fine. The gravity one likes to be bled out.

Since you have pressure at the gauge...

To evaluate your situation, open all injector bleeders, start on gas, open/close throttle. All should spit out fuel on demand. Do not run for more than 10 minutes on gas, and then be sure to close decompression when shut off.
 
i had an injector sticking open on my 400D and i was told on a different forum to take the sediment bowl off and fill it with ATF. then pour the rest of the quart into the fuel tank. when i fired it up it worked great. maybe there is something in there that is gummed up and from what i was told, the ATF kind of cleans that stuff out. just a thought....
 
(quoted from post at 06:39:28 05/01/10) i had an injector sticking open on my 400D and i was told on a different forum to take the sediment bowl off and fill it with ATF. then pour the rest of the quart into the fuel tank. when i fired it up it worked great. maybe there is something in there that is gummed up and from what i was told, the ATF kind of cleans that stuff out. just a thought....
Click to expand...

ATF or Marvel Mystery Oil. Either work well. The hard part is getting it into the main pump internals quick enough before it sends it back to the tank.
 
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