Its a V-8...I know I know, but anyways. I'm trying to find out what injector pump is on it...Anyone have an idea? Its the 330HP model.

I'm working on it now, in our Stieger Panther Articulated tractor, and I kinda need to figure it out so I know what fittings the fuel feed line use.

If anyone wants to see the thing I can post up some pics here when I get a camera. Its a BIG motor in a BIG tractor, and I haven't even put the second set of wheels and tires on it yet.

Oh yeah, my next project is a Onan GenSet with an I-6, its just a 200kW generator, nothing big...

 

My dad might know how to find out:

We have two stiegers one w/ a 903 (its a general POS) and one we swapped a 855 cummins into (lengthened the frame a bit).

 

What makes your 903 a POS? Just asking because I'm working on our fel system and I can't find a lift pump anywhere...hard to believe the injector pump creates suction through nearly 16' of 1/2" hose and through 2 fuel filters. Wondering if I should through something on there.

I'm really looking to tear all of this 1/2" braided fuel line out since half of it leaks at the fittings, and replace it with something more reliable. Problem right now is I can't figure out what thread the injector pump supply line is.

Your tractor looks about the same as ours, but I think your is newer, ours has a different grill, and is generally more of a nice rust color.

 

I used to have one in an ol 73 KW. It was called a VT-903 and as I recall, it used the same PT pump the NTC series used. They were pretty popular in marine applications (boats), so I changed the stock (about 3/4" wide) gear pump section to a bigger gear (1-1/4" wide) gear and had more power than I could safely use! I did get a couple of smoke tickets in Arizona because of it but I could run right with a KT450 so it was worth it.

 

It doesn't have nearly the power of the 855, A/C is junk, we've had to rebuild a couple of times. I don't guess its really a POS just doesn't compare to the straight 6 . I think ours might be a size up from a "Panther" not sure of the exact model, I think its a "Tiger 3". The one with the 855 was painted when we put in the motor so it does look pretty sharp, IMHO.
Try calling these guys here:

D & S Salvage
280 Dewitt Dr
Sikeston, MO 63801
(573) 471-6220

or these guys

Double D Tractor Parts Inc
1078 US Highway 62 E
Sikeston, MO 63801
(573) 471-2727

or maybe:

Worthington AG Parts
1156 US Highway 62 E,
Sikeston, MO - (573) 471-3969

Hope this leads you in right direction. They should be able to get you parts or help you with your problem.

 

I used to run them in a Massey 4880 & 4900. They're not junk but there are a number of things to keep them running well. First, and most important, keep a good handle on your coolant. 903's are famous for liner cavitation. Check the coolant with test strips and make sure you keep the additive package up to snuff or the coolant filter, whichever you prefer, as they do the same thing. Of coarse keep the oil & filter changed often too. Also, I would run the overhead on them every 700 hours or so, just to make sure the valves and injectors are set right too. I took my 4900 from a stock 375 hp up to 600 with no problem. I took the pump off and we just changed one of the washers and springs in the pump. Be careful as this is a PT pump and runs the same as the 855, but it rotates the opposite way, so they won't interchange. Also, This pump is really not an injection pump, in that it does not meter and pressurize the fuel to a high pressure. It functions somewhat like a lift pump, and basically feeds fuel to the injectors. Since the injectors are driven off the engine camshaft, they are what time, meter, and pressurize the fuel for combustion. To have a pump shop go through the PT pump is only about $300, it's the injectors that are pricey. I know a guy with a 4880 Massey that was up near 1000 hp with the factory injectors, just cranked the snot out of the PT pump. Took a couple of hours to do and just switched out washers and springs. Also, 903's won't lug down very far. Keep the revs up around 2700 and you'll be ok. Below about 1900 they are a dog and don't have much torque. You can still find parts for them pretty cheap. Most guys hated them in trucks, but they weren't too bad in farm tractors. The military still uses them in some tracked vehicles at 800+ hp, so they must not be too bad. they just don't lug down like an 855. you just have to get use how I've got a complete Cummins shop manual for the 903 series engine that I would probably sell. It's a great resource for anything to do with these engines.

Mike

 

Mike

I have a 903 in a '74 F-shaker. It has a bad turbo seal; is the turbo interchangeable with one of another engine?
The tag off the turbo says:
ST50
150014-9000
T-6693-10 U
AR45428

How much do you want for the manual?

Nick

 

i have only seen one in my life it was in a log skidder that dad and i had to do some welding on

 

I have must not have have known that there were any low powered ones out there. All the ones I have seen have been 900+ hp. I see about 3-4 a month in the hallway at work. I believe that the biggest hp one was 1500 hp. Now these don't go in trucks. These are for NATO and are being tested still. Heck, Cummins still has a 903VHHP dept. HHP stands for high horse power.Don't really know much else about them, we don't put them into trucks so I don't mess with them.

 

They are V8's wow! I know that the new Stieger STX 530's are 915ci and are inline 6. They are some monsters.

 

I've seen a couple vt903s with broken cam shafts.......not her nor there but they've been known to do that on occation

 

Only 903s I've seen were in stiegers and in a 8850 deere articulating tractors. Not sure on the injector pump is on it though.

 

did you do a turbo upgrade too? i would imagine that kinda power would get hot when farming with a big implement. or would you just downshift and run the rpms higher? do they have pyrometers? i used to run an old case 4wd that came with one factory

brett

 

Didn't have to change the turbo at all. The turbo was not a holset but a Cummins and was HUGE! That thing looked big enough to power 2 of these engines. I didn't have a pyro on the tractor, but just used my head a little when running it. Under load I never let it get below 2200 and if it pulled down to that I would downshift. Again, you can't really lug a v8 like a 6 cylinder, but after I turned it up, it really didn't burn much more fuel than at the factory 375 hp. I think it's just like a DOdge CTD truck that's been Bombed, it gets better economy, with more power. At 375 hp, the 903 isn't hardly working at all. I used mine for pulling a big honey wagons (7300 gallons=@ 100K #) and they did a great job pulling them. As long as I could get the power to the ground they were unstoppable! They really screamed though and you could hear them with a 6" straight pipe over 3 miles away! HA. I was pulling a pan scraper with my 4900 and a buddy of mine could stand outside his house and hear it plain as day over 3 1/2 miles away! Said it sounded like it was right next door! I had to make sure not to start too early or run too late doing that, because their were newer houses right across the street.

 

Yeah, our Steiger has a 5" pipe and it can be heard clear across town. Working on converting it to run on Veg right now...I'll get some pics up when I get it finished. I'm really hoping that since its stock a 3/8" fuel line will be big enough. Stock is 1/2". Trying to find any SVO parts in 1/2" is **** near impossible. I threw on a lift pump to try to up the flow, we'll see how it works out...the stock fuel system doesn't use a lift pump, so I'm thinking it will make it reasonable.