Diesel engine : Kromhout Gardner 4LW 1940

[minh-thanh]

Hi Everybody .
An update:
" You died in the game , you get a new life and continue game "
I made a new valve block, I decided to use aluminum because I ran out of brass. Using aluminum or brass as the valve block I think it doesn't matter
First valve block the holes are not concentric , I think it's a matter of making the valve sometimes closed and sometimes not , and I have also changed a bit .. and also positioned and drilled the holes more accurately...hopefully this time will be good enough .

 

[minh-thanh]

Hi Everybody .
An update:
Maybe I solved the ball valve problem
Fuel pump worked , the part to adjust the amount of fuel for each injector : works quite well and I'm adjusting the amount of fuel, I will try to equalize the amount of fuel for each injector,

 

[Mechanicboy]

Hi Everybody .
An update:
Maybe I solved the ball valve problem
Fuel pump worked , the part to adjust the amount of fuel for each injector : works quite well and I'm adjusting the amount of fuel, I will try to equalize the amount of fuel for each injector,

View attachment 147422

View attachment 147423

Check the timing must be exactly same for each pumps to be sure the each get right timing, since the engine is 4 cylinder then it begins to end in timing 0-90-180-270. Use degree disc on the fuel injection pump and check carefully when the pump begins to pumping the fuel 0-90-180-270. If fault: incorrect timing of camshaft for injection pump, clearance between cam/pump piston to example fault in the amount regulator between pump/cam.

To check amount of fuel vs counts of pump stroke: Use syringe I'm millilitres without piston + injection pipe to drip fuel into the open syringe to measure millilitre of fuel amounts. Rotate the fuel pump in 300 turns and compare the fuel amounts are same in each syringes. Both in "idling" and "full throttle" position the amount of fuel must be same in all pumps measured I'm millilitres. If difference between the pumps, adjust the fuel amount regulator for this pump who has less/more fuel than other pumps.

 

[minh-thanh]

I know what you said , but the big problem is : it is not possible to adjust a very small amount of fuel , about 0.1 , 0.15 or 0.2 mm3 for each injector , I'm just trying to adjust a relatively equal amount of fuel.
With a small diesel engine, there are many factors that I cannot control, especially the parameters ...of the springs in the injectors and in the ball valve system.

 

[Mechanicboy]

I think you misunderstood me. Also not measure per pump stroke and check quantity. So you have to pump 300 times (300 revolutions on the pump shaft of the injection pump) and measure the amount of fuel on each measuring cup of the syringe without piston and compare with all the pumps delivering roughly the same amount in milliliters. The same thing we did with the injection diesel pump for vehicles when we measured the total amount after a certain number of spins and compared with all the pumps delivering roughly the same amount of diesel in the measuring cups in cm³.

 

[minh-thanh]

Hi All !
Just a small update
From the last post until now , I'm a bit busy so the engine is still on the shelf, I'll be back with the project in a few days.

 

[minh-thanh]

Hi All !
Just a small update
Today I can return to the project
A video when I was adjusting the amount of fuel
The results seem pretty good

The video is a bit shaky...please sit down while watching

 

[Roger B]

Looking good
Can you judge how even the injection timing is?

 

[minh-thanh]

Roger !
Thank you .

Can you judge how even the injection timing is?

...You always ask difficult questions for me
The way I do it with this engine and the others I've done: don't put all the standards of big engines into a tiny engine that I can do.
With a single cylinder engine, I know the injection time is between 22 and 45 degrees before TDC, so with this engine I will set the injection time to 30 degrees before TDC and then the injection time of all 4 injectors is between 22 and 30 degrees before TDC
Note: injection time is the time the lobe begins to come into contact with the plunger
injection time : injector 1 - 30 degrees, injector 2 - 27degrees, injector 3 - 20 degrees and injector 4 - 25 degrees, the engine will still run.
the same injection time of the injectors is almost impossible for me