goodwrench diesel

And since you are in mechanic's class, why not take a minute to find out what engine you are working with. Calling it a Goodwrench means nothing, other than is is a replacement GM engine.

Is it a 5.7 Oldsmobile (warmed over gas engine), a 6.2 litre or 6.5 litre diesel, or one of several other possilities?

Now it's my turn.

I don't know who started this piece of misinformation; but it's been around since forever, I'll grant you that.

That N engine is not the same as the gasser. Flip it upsidedown and take a look at the webbing. It is a totally different block. They do look the same from the outside tho. :>)

Have a good one,

Allan

However, the diesel version shares most of the gas engine dimensions, and for one thing, they were not designed with enough headbolts for diesel use, and hence the unending head gasket problems with the 5.7 diesl.

Down at the bottom of the pump, there is an advance button that is activated by a pivoting lever arm.

Make sure that little button is not stuck "in". This would throw it into full advance all the time.

Also, are you sure you have all the air out of the system? They are sometimes a stinker to bleed and will act just the way you describe until all air is purged.

With 3 or 4 seconds of run time, it sounds maybe as though you are running on the either only?

Be careful with the either, but you should be able to "spoon feed" it to keep it running long enough to purge itself of air.

Another thing: The very first time that you took that solenoid cover off, did you see any tiny, little black specs of plastic looking material laying in there? If so, perhaps the wafer plate is shot. In this case, you need to have the pump rebuilt.

Allan

FYI, that is not an advance, but a RETARD. The more the little button is pushed in, the more the cam ring is the pump is retarded, to compensate for the earlier start of injection when you stomp on the footfeed, and pour the coals to it.

As the diesel pump pistons achieve full stroke under full fuel rate, injection starts earlier, since the pistons in the more completely filled bores contact the cam ring sooner, so this retarding of the cam ring is needed to back off the timing of the start of fuel injection to a safe point.

Could be; all I know is that all those GM schools and service manuals call it an "advance" plunger.

Further, the darned old things just wouldn't run right if it was "stuck" in. :>)

Thanks,

Allan

When ya get 'er running, if it is setting there a knockin' and a smokin', chances are everything must be okay. :>)

Allan

Did you get that outfit bought up on ebay where I noticed you waving your arm in the air tryin' to get the autioneer's attention? :>)

Allan