Need help with 8V92TA stalling issue

[jjb]

The check valve is usually a special fitting installed on the cylinder head outlet that returns fuel to the tank.  The fitting has a pipe thread that screws into the head, and the return hose threads onto it.  It looks like a normal fitting, but the internal diameter is reduced to 1/16" or thereabouts.  That restriction is what allows the fuel pump to build pressure.  It's often overlooked when swapping in a new engine since unless you look closely and know what to look for, you would mistake it for a normal full flow fitting.  If you find the return line and trace it back to the engine, that should be it.  The check valve on the supply is a different deal, it is there so that the engine holds prime.

I installed all of the fittings from the old engine on the new one.

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[jjb]

The check valve is usually a special fitting installed on the cylinder head outlet that returns fuel to the tank.  The fitting has a pipe thread that screws into the head, and the return hose threads onto it.  It looks like a normal fitting, but the internal diameter is reduced to 1/16" or thereabouts.  That restriction is what allows the fuel pump to build pressure.  It's often overlooked when swapping in a new engine since unless you look closely and know what to look for, you would mistake it for a normal full flow fitting.  If you find the return line and trace it back to the engine, that should be it.  The check valve on the supply is a different deal, it is there so that the engine holds prime.

I still have the old engine so I can double check. (Trust but verify 😃)


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[bevans6]

I had check valve on the brain when I wrote that, I meant to say "restriction fitting" not check valve when referring to the fitting on the engine that the return fuel line connects to.  Just find that fitting, take the hose off and see if it is full ID or 1/16" ID.    Sorry for the confusion.

[eagle19952]

I had check valve on the brain when I wrote that, I meant to say "restriction fitting" not check valve when referring to the fitting on the engine that the return fuel line connects to.  Just find that fitting, take the hose off and see if it is full ID or 1/16" ID.    Sorry for the confusion.

there are many...here is one, they are normally engraved R-xx   often 80 or 90 or ??

[jjb]

Can you tell from this?

[jjb]

It looks like its 14 in the above diagram. Its part number 8924182. I'm pretty sure I put it on the new engine but i will double check.

Thanks for pointing that out.

[bevans6]

If I was to suss out that diagram, I would say fuel comes out of the filter and into the rails on the head via thingies 19 and 4, and the return comes out of each head and is tied together at thing 13, so thing 14 is a real good bet.  I take it the engine still isn't running well?

Brian

[jjb]

If I was to suss out that diagram, I would say fuel comes out of the filter and into the rails on the head via thingies 19 and 4, and the return comes out of each head and is tied together at thing 13, so thing 14 is a real good bet.  I take it the engine still isn't running well?

Brian

I looked up the part number for 14 "8924182 ELBOW, 5/16"-90 DEG. TUBE; 1/4" PIPE (.080" REST.) (W/SEALANT)"

I haven't had time to do anything with it. Its runs fine until it gets to operating temp  .

[luvrbus]

Give us some idea on how it sounds when it starts to stumble after warming up

[jjb]

Give us some idea on how it sounds when it starts to stumble after warming up

it sounds fine they it sounds like its going to stall and it does or it will continue running normal but the tach goes to 0 which I would assume is because its idling too low to register.

When I hit the high idle switch it stumbles for a bit like its got air in the fuel but after a few minutes at high idle it seems to run fine.

I think I really need to make sure that orifice is in place and replace all of the fuel lines and filters and see what it does.


The other thing I forgot to mention is that the jake brake doesn't seem to work as good as it should. It seems like its on low all of the time. It has 24-28 volts like its supposed to.

[luvrbus]

There are o-ring (2) on each solenoid if you pinch one or lose one installing those it takes a while running but they will make a engine stubble as they build pressure and partially engage the Jakes and so will bad control valves in the Jake.

What do you use the vehicle for I bid on 1 on the Iron Planet site but missed it and had no idea what I could use it for but I thought it was neat      

[jjb]

There are o-ring (2) on each solenoid if you pinch one or lose one installing those it takes a while running but they will make a engine stubble as they build pressure and partially engage the Jakes and so will bad control valves in the Jake.

What do you use the vehicle for I bid on 1 on the Iron Planet site but missed it and had no idea what I could use it for but I thought it was neat      

The engine was rebuilt by diesel exchange in 2010 so I would have no idea. I guess I have lots of work to do.

I honestly bid low never expecting to win . At least that's what I told my wife.

I use it in shows and parades and around the horse farm. Just a really big toy.

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