The Fordson Tractor Pages Forum

Sorry for all the questions, but here is one re. injectors;

In a recent thread, I asked about the FSM slobbering some oil from the manifold, and relating this to an aquaintance, was told it may be caused by worn injectors tips, pumping out too much fuel.

Q;
Can an engine produce Very good power with worn injectors?

The Super has all the power I could ask of it, and does Not smoke under load, and no smoke after start-up....just a slight haze.

Thank you again. I really appreciate being able to come here with my Q's and get all the answers!

Best wishes,
Richard.

To put it mildly "cobblers"!!!!! No such thing as a worn injector tip. A broken one yes, then you would not see for black/white smoke and misfire.

There is a peculular idea over on your side of the pond that a diesel will pump diesel into the cylinders without burning it.

I see lots of posts about diesels blowing diesel from the exhaust. That is not really possible. If you get unburnt diesel, it goes out as black smoke, it is not unburnt but combustion is not complete if that makes sense.

If a cylinder is not firing at all, then you might get some out of the pipe but if you think about it, diesel is put into the cylinder in a fine mist, it will wash the cylinder walls and clean out the carbon seal on the pistons, allowing the oil to get past the piston. Once it is put back into hard work, the diesel burns properly and the carbon seal regenerates.

Brian,

I had to laugh at your reply!
It's sort of what I thought. The funny thing is, the aquaintance mentioned is from England, as well.

I have seen diesels putting out vast clouds of white reek when they weren't firing, but not otherwise.


On the "worn tips" note;
What is the reason to replace the tips when an injector is being serviced, as is often deemed nescessary?

Thanks for your reply, Brian!

Richard.

The usual cause of replacement for worn tips is spray pattern and dripping due to a valve seat failure

Breakage by removing direct injection cylinder heads without taking the injectors out, scoring of tip and holes by cleaning with a wire brush and progues rather than with a copper or brass ones.

I got 600,000 miles out of a Ford Sierra without any problems on pump or injectors. She did not smoke and started easily and ran on the day we scrapped her because she had worn out the second gearbox.