2H fuel ajustment screw ?

[xtremitys]

I got a hj47 that i revenrlt bought & spent heaps on parts fixn it up , time ,etc left me short lol , i drive it down the road to testing station & notice excessive black smoke .

So anyone know exactly where the mixture screw is on the injection pump & what direction to turn it to lessen the amount of diesel injectd? Photos? Help appreciated

 

[lostmarbles]

I got a hj47 that i revenrlt bought & spent heaps on parts fixn it up , time ,etc left me short lol , i drive it down the road to testing station & notice excessive black smoke .

So anyone know exactly where the mixture screw is on the injection pump & what direction to turn it to lessen the amount of diesel injectd? Photos? Help appreciated

The "maximum fuel" screw is as follows:





Screwing inwards (clockwise) lowers the "maximum fuel limit"

 

[xtremitys]

Thanx lostmarbles , so winding that down gradually will lower volume of delivery? Shame dont have egt gauge yet.

 

[xtremitys]

Mine looks different , is it the same screw?

 

[xtremitys]

 

[xtremitys]

 

[herbs]

Injectors should be done every 100000 kms, injector pumps go forever.

 

[lostmarbles]

Wow! It does look different. (I didn't expect that.)

The locking "nut" appears to need a special tool on yours.

Perhaps you should wait for someone who has a 2H engine with one of these particular "full stop capsules" to confirm that it does the same thing as mine and that it is indeed what people usually adjust? (Alternatively, at least mark the original position before adjusting it.)

Here's a pic (from a pdf file I found just now on 2H engine fuel systems) that shows something that looks like yours:

 

[xtremitys]

 

[Freewheel]

Yes that is the correct screw. I use a punch and hammer to start the special locknut (as it looks like you did) and then a fine set of needle nose pliers half open with the prongs of the pliers stuck into the little holes of the locknut to turn it.

Make sure to take note of the fuel screw's position - keep careful count of turns, or better -use a caliper to actually measure where the fuel screw is sitting.

Adjust it in 1/4 or 1/2 turns to start...

 

[xtremitys]

Injector pumps dont go for ever , some people think injection pumps just pump diesel, when they do everything, precisely measure & deliver fuel to suit engine revs , etc . Injectors are just a valve that opens and closes under high pressure & spray a certain pattern spray like a garden hose nozzle does

 

[xtremitys]

Lostmarbles, freewheel > how much did u wind ur screw in ?

Wound mine in 2 full turns now & hardly done anything , but when i forgot to put the rod back on thats gos the intake valve thing , had no power & no smoke what so ever , what does that rod thing do ?

3rd turn workd a treat , but i think my engine is glazed , hence had to do it that much, going to try that antiglaze/carbonizer liquid , workd a treat on anothr 4x4 i had last .

 

[lostmarbles]

Injectors should be done every 100000 kms, injector pumps go forever.

That's always been my understanding too (with inline-type pumps anyway).

Lostmarbles, freewheel > how much did u wind ur screw in ? .....

That's never been altered in my BJ40 during my 30+ years of ownership. So I don't know.

(People usually only alter them when they fit a turbo and I haven't fitted one.)

 

[Tapage]

I did play with my fuel a lot ! before my turbo setup .. but all that was after my pyro was fitted at my exhaust manifold ..

 

[darthvincor]

Just reviving this thread again as I have a similar issue with a 2H (auto).

Under normal driving there is no black smoke, but when the rpms approach 3,000 I get black smoke, and as I understand it, there shouldn't be any black smoke at any rpm, except maybe in the red zone at 4,000?

I took it to a diesel specialist 3 years ago, and they determined that the fuel screw was set too high, probably by the previous owner to get a bit more power out of it. So they turned it down 2 full turns.
Black smoke at higher rpms was gone, but returned again a few months later, though I did not initially notice it, because I never go above 2,000 rpm.

My questions are:
1. Should I turn the fuel down even further?
2. Is it possible the screw wound itself back out again after the diesel guys wound it in?
3. So, the maximum speed screw doesn't just dertemine the maximum rpm, but the maximum fuel at all rpms?
4. And finally, just a confirmation after consulting the FSM, that this is the correct screw for the auto pump? (as always, things are different on the automatic transmission fuel pump)

Thanks,

Vince

 

[Slowerthanu]

Bringing this back. I cannot get this capsule nut on the fueling system to come loose. This is a standard right hand thread correct.

NEVER MIND, I got it. Still smoking at idle though.

 

[mongoose2231]

I'm about to mess with my fuel stop capsule as well. Done filters, diaphragm, injectors and I still smoke a storm under load. I'm assuming the capsule has been messed with. Will report on the findings. I also get less than ideal fuel mileage so I assume it that

 

[mongoose2231]

My screw is all the way in. Only 3 threads left before reaching the end, so I won't touch it.

 

[GarethsSixty]

I wouldnt touch the fuel screw until id made sure 100% there wernt other problems. I see a lot of guys adjusting there fuel screw because the engine suddenly becomes smokey, if it starts smoking out of the blue theres other issues and adjusting the screw will mask it

 

[mongoose2231]

Bought truck like that 3 month ago. Did all the possible fixes and its same. It don't bother me much but then again I wanted to see if I can rid myself of the problem