MD diesel side question.

[lbg57]

Finally got the MD I have been working on for several years started & running.

Runs on the gas side fine, no smoke at all.

When switching over to diesel, it runs but smokes a lot. At about 1/4 open it runs ok but their is a fair amount of smoke. You open it up quickly from 1/4 throttle to WOT and it smokes like a coal freight train for a few seconds then backs off some on the smoke but still a lot. Smoke color is grey.

The injection pump and injectors have been gone through by Central Fuel Injection and has been sitting in a box for the last 5 years.

Air is all bled out of the lines and the pump timing is set at the center mark on the drive gear per the manual. When running and I crack open the injector bleeder it misses bad so the injector should be working correctly, right?

Any ideas as to why it is smoking so much? Is it something in the pump that is not quit right? If I try to adjust the pump timing to either side of the center mark would that clear it up or is their another direction you think I should proceed with this? Thanks.

 

[rustred]

advance the timing 10 degree's more and go with that if still smoking give it more advance 5 degree's at a time. had same problem with one .

 

[lbg57]

I will try the timing thing as you suggested.

 

[n9lhm]

Air filter or intake restricted? The amount of air it needs through that tiny starting carburetor to run on gas is small compared to what it needs to run on diesel.

 

[rustred]

he said running on diesel.

 

[Oldiron29]

to much fuel from injector pump. If the return line is clogged it will smoke
must clean injector pump plunger and return check valve in pump. Manual is a must to lean how injector pump works.

 

[n9lhm]

I know, that's why it would fine on gas but not on diesel. Disconnect the air intake pipe from the air filter and try it that way. It'll only take a minute to take off the hose clamp and try it.