MF 150 Diesel no-start

[Harry in Ky]

If you are lucky enough to get at least two injector lines loose at the injectors (which you WILL need to do even if you pull the pump for repair) you will only see small pulses of fuel up there with each stroke. It will NOT be a high pressure squirt as some might lead you to believe. If you see anything consistent at all up there, the pump is probably working. If the engine is running and you crack one you will see much more pressure and flow, but merely cranking with the starter you won't see much.

Sometimes you need to bend a 5/8 wrench or two in order to get the nuts loose up there without removing a lot tinware or moving fuel tank.

 

[virto]

If you are lucky enough to get at least two injector lines loose at the injectors (which you WILL need to do even if you pull the pump for repair) you will only see small pulses of fuel up there with each stroke. It will NOT be a high pressure squirt as some might lead you to believe. If you see anything consistent at all up there, the pump is probably working. If the engine is running and you crack one you will see much more pressure and flow, but merely cranking with the starter you won't see much.

Sometimes you need to bend a 5/8 wrench or two in order to get the nuts loose up there without removing a lot tinware or moving fuel tank.

I'm talking about a drip of fuel every 10 seconds of cranking or so. There has to be SOME level of pressure in order to fire the injectors and I'm pretty confident this isn't nearly enough lol. There's no way it could run on the amount of fuel getting up the lines.

The worst part is I originally had fuel up top (flow and pressure unknown, but it would flow freely from the injector returns when opened) and after screwing around with it a couple days, moving the stop rod in and out and the throttle, I got nothing at all. Opened the top, made sure the MV was free, now I get the smallest amount out of it.

The wrench situation is, frankly, obnoxious. No problem with the tank off but when it's back on (like now) it's nearly impossible. I took a 5/8 to the bench grinder to flatten it out some and it helps. Why nobody seems to make straight wrenches without a turndown in the head or some very narrow ones, I don't know.

 

[Harry in Ky]

Flow from the injector returns can be deceiving. It's mostly coming from the return line not from the injector. The return from the injector is very very small and rarely (if ever) seen when cranking. The engine must be running for actual injector overflow to occur. What's in the line is mostly injection pump and/or filter housing overflow on its way back to the tank, not really from the injector. Since it's not running, that eventually slows and stops.

As for the wrenches Perkins made the engine, then Massey screwed it up by putting the tank where they did. Another inch or so higher would make a world of difference getting in there.

 

[virto]

Flow from the injector returns can be deceiving. It's mostly coming from the return line not from the injector. The return from the injector is very very small and rarely seen when cranking. The engine must be running for actual injector overflow to occur. What's in the line is mostly injection pump and/or filter housing overflow on its way back to the tank, not really from the injector. Since it's not running, that eventually slows and stops.

As for the wrenches Perkins made the engine, then Massey screwed it up by putting the tank where they did. Another inch or so higher would make a world of difference getting in there.

Oh maybe that's the whole mess then, it was never really coming UP from the pump but rather down the other side of the return, which tees into the tank and is fed from the lift pump through the secondary filter. I'll be damned that makes sense.

Perkins could have done a little better job by rotating the injectors 90 degrees so the lines were perpendicular to the engine block and not parallel, like on that 185 in the video listed earlier. That would have solved most of the problems!

 

[Harry in Ky]

The design of the head on the 152 is totally different to that of the 236 and 248. I can't speak for the reasons the injectors are what they are.