Injection Pump pressure adjustment

[dadannyboy]

Does anyone know if the Injection Pump pressure can be increased on a DK-35. Thanks

 

[Bavarian]

As far as I know, on mechanical systems, the injection pressure is not set at the pump. The pressure is determined by the spring load in the injector nozzle. It's best practice to have the injectors "synchronized". After a rebuild with new springs in there, there can be shims added to get them equal.
The pumpguy on this forum might be able to explain it better.

On common rail systems, there is no chance to do anything. And the pressure is in a range you don't wanna mess with.

 

[Boss 302]

Common rail can probably be manipulated via programming which isn't something that can be done without the proper equipment however, the fuel on the pump for mechanical injectors can be adjusted weather it helps without doing injector work I don't know.

 

[thepumpguysc]

I don’t understand the question.. what r u trying to achieve.??

 

[Boss 302]

The way I understand it is, by adjusting the fuel delivery screw on a mechanical pump will that in turn effect horsepower?

 

[RickB]

The way I understand it is, by adjusting the fuel delivery screw on a mechanical pump will that in turn effect horsepower?

That is a volume adjustment, not a pressure adjustment.

 

[LouNY]

Or commonly called the smoke screw, turn it in till she was smoking then back off till you could live with the smoke.
One of the Deere 4430's my brother picked up was set so high that when you put a heavy load to it, hauling loaded self unloading wagons of silage up long hills you would actually get fuel misting down on you. Backed that one down quite a bit to reduce the excess fuel and smoke and she is still quite strong 30-40% over stock. It was built for "farm stock" class tractor pulling before he bought it.

 

[RickB]

Those 404's weren't really right till they had some 'adjustment'. I had a 4320 and after that a 4430. They both ran real nice at about 160. Had to be careful of the clutch and temp gauge on the 4320.

 

[LouNY]

HP does make a lot of heat. We have 3 pulling tractors that have been slightly detuned that are used as road haulers for haylage and silage hauling. They had been repainted and reworked so look nice while doing the job. The heavier tractors can do more work but the road hauler are much faster on the road. We had one farm that when I headed home at night with the last load the 7130 Magnum 4wd which had been twisted up just a bit would have to drop clear down to 10 gear on the 18 speed on one long steep grade with the chopper and loaded wagon, the road haulers could pull it in hi all the way, they would be leaving a smoke trail the last few hundred feet of the pull and the temps would be getting up it was a good thing it leveled of when it did.

 

[Boss 302]

Yup, that's what the screw should do is increase fuel but, does it increase power?

 

[RickB]

It will up until the point where it doesn’t.

 

[thepumpguysc]

We’re just talking amongst ourselves fellas.. he hadn’t been back since he posted the question..

 

[the old grind]

...commonly called the smoke screw, turn it in till she's smoking then back off till you can live with the smoke. ..

Well said.

Yup, that's what the screw should do is increase fuel but, does it increase power?

See quote above. Or:

It will up until the point where it doesn’t.

Voted best answer.

 

[Boss 302]

So the answer must be yes.

 

[RickB]

We’re just talking amongst ourselves fellas.. he hadn’t been back since he posted the question..

That's the way TBN works. We see exactly that all the time.

 

[the old grind]

Correct me if I'm wrong, but since we're merely tweaking the limit of fuel delivery, if we need more power it's probably there and risk free. IMO the test of what's useful is to look for smoke. Say the temp gauge is a guide to keep going or back off and cool weather is better to tweak.

I'd want to get some seat time with each adjustment then. Then the temp gauge will show us our limit on hottest days, toughest jobs, etc.

btw, IMO a guy with a brush hog has the most need for more hp and the best PTO gear to find out what's to be gained. And whomever else is waiting for OP to return, just "Tell me you're not that guy."

 

[jonsstihl]

nothing is risk free in life. more power is great but in reality other things will break or overheat but tractors are built tough. you take a 100 hp tractor and turn it up to 200hp. dont expect to run all day every day at 200HP and not have trouble keeping the temps down or without breaking stuff.

I work in aircraft turbine engines and power is limited by temperature of the engine. an engine rated for 1200 shaft horsepower can easily produce 1300 or 1400 hp by giving it more fuel but you have to watch the temps and as the engine wears out that buffer of extra hp gets lower and lower until you are making your rated hp at the max engine temp. after that it is time for a rebuild.

 

[Boss 302]

I think most of us know there are risks to adding more power, just ask the young fellows that put programmers on their diesel pickups. I have done quite a bit of work on common rail trucks mostly due to people turning them up. I believe the manufacturers are a little on the conservative side and if that's the case just be smart about it.