Roosa Master Injector Removal

Lee Brown · Sep 8, 2019

I'm trying to remove a Roosa Master injector pump from my 431 diesel and am down to the 3rd bolt near the motor block. Any tools, techniques, or tips anyone could offer for getting that nut off of the stud? The closed end 9/16" wrench I'm using doesn't get down onto the nut squarely.

Thanks,
Lee Brown

chuck machinist · Sep 8, 2019

May I suggest this wrench from snap on or with a grinder modify an existing craftsman wrench of that size. All you really want are little bites at a time until the nut loosens. CM

Dieseltech · Sep 8, 2019

The three bolt pump mounts a custom made wrench works best. I have an old 9/16 open end wrench welded up just for the Case, JD, and Oliver/Waukesha engines for the back stud nut. Even Snap On right angle wrench won't work well on that stud nut. Mine is about 80 degrees to the handle..

r.w.b. · Sep 8, 2019

I cut a 9/16" starter wrench open and it works just fine

ADB-Ia · Sep 8, 2019

I used to hate cutting or bending a wrench to work in a one or two time application but I've learned that it can save a ton of frustration to just make a tool that works. Saves on band aids and curse jar money as well. You can take that money you saved and buy a new wrench to replace the one you modified.

point3dave · Sep 8, 2019

I remember using a 916 socket and a universal joint on a long 3/8 extension when I worked for Don L Dave K

DKase · Sep 8, 2019

1/4" drive 9/16" socket works perfect on 730 + larger tractors. Not sure on the little ones, but worth a shot. 1/4" extension is small enough to get in there when 3/8 is to big.

Dieseltech · Sep 9, 2019

The 730 and up models use the Bosch inline pump, not the Stanadyne/RoosaMaster..

mEl · Sep 9, 2019

regular 9/16 - 5/8 curved starter wrench ground for easy clearance, mine was a flea market find and has served me well for many years and dozens of those pump removals and re-installs.

flagman · Sep 10, 2019

Hello Dieseltech: I have a case 1030 that i just changed all three fuel filters and as i attempt to bleed the system i am able to fill and bleed the primary filter but i cannot get any fuel past it to the secondary, can you possibly tell me what is blocking the flow, i have done this before on this tractor with no problem, i have put an electric fuel pump before the filters for bleeding usually works fine for me. thanks ron fancher

mEl · Sep 12, 2019

Not Dieseltech but regard him as a friend but the first filter is a gravity flow, the second stage and final stage are on the other side of the circuit from the transfer pump.fuel must flow through the pump to get to the next two, the pump does that, is there a t valve on top of the filter base, if so open it to bypass the pump. if not, on tractors with the relief built into the filter base I remove the plunger so the fuel can bypass the transfer pump, if so equipped it is a nut on the face of the filter base, remove it and fuel should flow freely to all the filters then reinstall.

flagman · Sep 14, 2019

(quoted from post at 06:11:52 09/12/19) Not Dieseltech but regard him as a friend but the first filter is a gravity flow, the second stage and final stage are on the other side of the circuit from the transfer pump.fuel must flow through the pump to get to the next two, the pump does that, is there a t valve on top of the filter base, if so open it to bypass the pump. if not, on tractors with the relief built into the filter base I remove the plunger so the fuel can bypass the transfer pump, if so equipped it is a nut on the face of the filter base, remove it and fuel should flow freely to all the filters then reinstall.

Mine is a little different but it starts right up and the rest of the cylinders are firing nicely just # 6 not getting anything out of the pump. thanks ron

Roosa Master Injector Removal

Lee Brown

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chuck machinist

Well-known Member

Dieseltech

Well-known Member

r.w.b.

Well-known Member

ADB-Ia

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point3dave

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DKase

Well-known Member

Dieseltech

Well-known Member

mEl

Well-known Member

flagman

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mEl

Well-known Member

flagman

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