MF 240 the ones with the shut-off solinoid on the pump

[DLTTrekkers]

I have a MF 240 that runs and work great , but when I throttle down to idle and then jusks the throttle to full revs it starts to spatter like a petrol engine with a carburator that gets flooded .
If I take the revs up slow it runnes fine .
Help to diagnose ?

 

[Agvg]

How does it behaves when it's under load?

 

[DLTTrekkers]

Underload it runs fine

 

[DLTTrekkers]

In 40 years working on tractors this is my first time experiancing something like that !

 

[thepumpguysc]

Sounds like injectors that need a good cleaning.. spray pattern is not atomizing the fuel & its "flooding" the cylinder w/ fuel..
Does it BLACK smoke when it does it.??
IF no smoke.. check the filters..

 

[DLTTrekkers]

No black smoke.
I went thru the fuelsisteme...check all ....no problems.

 

[thepumpguysc]

TRY all your tests WITHOUT the air cleaner..& its best if u can pull the hose right off the intake manifold..
Have u tried moving the pump timing any.?? Find the timing marks on the pump flange & engine block,
& make a note as to where its at NOW.. THEN loosen the 3 pump bolts & twist the pump 1-2* one way or the other..
& TIGHTEN IT BACK DOWN BEFORE U START THE ENGINE!!! VERY IMPORTANT..
Good luck.

 

[ruffdog]

TRY all your tests WITHOUT the air cleaner..& its best if u can pull the hose right off the intake manifold..
Have u tried moving the pump timing any.?? Find the timing marks on the pump flange & engine block,
& make a note as to where its at NOW.. THEN loosen the 3 pump bolts & twist the pump 1-2* one way or the other..
& TIGHTEN IT BACK DOWN BEFORE U START THE ENGINE!!! VERY IMPORTANT..
Good luck.

Do pumps "advance" the fuel pulse to the injectors for higher rpm like the spark on gas engines?

 

[thepumpguysc]

Most ALL "rotary pumps" do.. they have an advance mechanism on the lower side of the pump housing..

 

[thepumpguysc]

DL.. U have a CAV pump right.?? IF its not painted over.. theres an arrow on the name tag..
To advance the timing.. u turn the pump OPPOSITE the direction of the arrow..{1-2*}
I hope this helps..