Injector problem or something else?

[AlbionWood]

You could also put a electric pump on from a fuel jug to test the low pressure fuel system. There fairly cheap and easier than injectors to do.

I don't understand. Do you mean pumping into the fuel filter assembly instead of gravity flowing from the fuel tank?

 

[nyone]

I don't understand. Do you mean pumping into the fuel filter assembly instead of gravity flowing from the fuel tank?

Fuel jug to new electric pump directly to the supply to injection pump. If the problem still happens I would change injectors and check compression. If new Injectors and compression is good your prob looking at a high pressure pump if your pump timing isnt off.

 

[AlbionWood]

Fuel jug to new electric pump directly to the supply to injection pump. If the problem still happens I would change injectors and check compression. If new Injectors and compression is good your prob looking at a high pressure pump if your pump timing isnt off.

I hope it's not the fuel pump, that's a pretty big job and getting the timing adjusted right looks pretty tricky. I'll work on the fuel supply end first, then the injectors, and if neither of those fixes it, I guess the fuel pump is the next suspect.

 

[AlbionWood]

Having trouble finding new injectors that match the old ones in this engine. Lots of places offering injectors for Shibaura N844 but none of them have leak-off lines and they are apparently for engines made after 1999; mine was 1992. I finally found a part number, at Messick's, but they want $356 for one!! Searching by part number is turning up only a few hits and most of those don't have photos, so I can't tell if they really are the correct style. At least one place had the right part number but what is shown is the wrong injector.
Looks like I'm just going to have to pay up for these if it turns out that's what I need. Maybe for $1,400+ I will try cleaning the old ones.

 

[thepumpguysc]

How about sending them to me for testing and rebuild if needed.??
BEFORE you do damage..

 

[mrmikey]

How about sending them to me for testing and rebuild if needed.??
BEFORE you do damage..

What he says, you're working with minute tolerances, you can't take 'em apart, give 'em a rub with some sandpaper and hope the work. Send them to The Pump Guy you can't go wrong, haven't heard one negative thing about him.

 

[California]

Ford NH 1920 with Shibaura N844 engine, has always started and run smoothly, but just recently began running a little rough, like one cylinder is occasionally missing.

It runs fine on Seafoam? Before you take anything apart please read my recent thread. Bad fuel!

I see you are 2 hours north of me. Your fuel may come from the same source.

Major problem? No, just bad fuel

Bad fuel recently gave me a nightmare of bad performance. This Yanmar YM186D is from early 1980's so after 45 years anything seems possible. But today I put in fresh diesel and to my relief, this solved the problem. It purrs again. Last weekend I mowed, and spent some time grading the lane...

www.tractorbynet.com

 

[AlbionWood]

It runs fine on Seafoam? Before you take anything apart please read my recent thread. Bad fuel!

I see you are 2 hours north of me. Your fuel may come from the same source.

Major problem? No, just bad fuel

Bad fuel recently gave me a nightmare of bad performance. This Yanmar YM186D is from early 1980's so after 45 years anything seems possible. But today I put in fresh diesel and to my relief, this solved the problem. It purrs again. Last weekend I mowed, and spent some time grading the lane...

www.tractorbynet.com

Yeah I did see that thread when I first started working on this. Drained the fuel tank, changed fuel filter and O-ring, refilled with fresh diesel, added Seafoam. No observable effect.

 

[AlbionWood]

Got the injectors out today and will send them out to be serviced. They look pretty bad, lots of carbon, I'm surprised it ran at all.