About 6 months ago i had all new piston and piston rods replaced plus all head gasket due to over heated engine from coolant not flowing. The oil pump worked well and the same with the pressure as being perfect before the work was done. Now that i had all the work done it has perfect oil pressure when it first starts up and when it get warm the oil pressure drops. It fresh oil, new filter new spark plugs and wires. I was told i may be the pump or something was not connected that could cause the issue. I spent a little over $1600 to get all the work i had done. Still now 6 months later my truck still sit in one spot.

 

What is your oil pressure doing?

Moving this to 2nd Gen Dakota section for ya.

 

Is still the same old sender? Have you checked the pressure with a real gauge?

 

When is starts it has full oil pressure. Once it gets warmed up the oil pressure drops to 0 and shuts down.

 

Verify oil pressure is dropping off with a mechanical gauge. May just be a bad sending unit, but, even that shouldn't cause the engine to shut down. (PCM really doesn't care about oil pressure. It'll whine if it gets to low, but, it will happily continue running the engine till it blows up.)

 

Ok. The sending unit was replaced also was pressure checked and that was good.

 

Well, something isn't right. If the engine isn't making any rude noises...... or dumping oil out on the ground, something either came out of place, or the 'new' sending unit is bad. Need to find out which.

 

I was thinking when he took my piston and piston rod out because he never removed the engine. He just disconnected the front dif. For the 4 wheel drive to get the oil pan off to get to rods. Maybe and if the oil pump parts was in the way that he may have not put them back together or something. But not sure until i get someone to look at it. And being it is my work truck and my only vechile. At this moment everyone i talked to about this and tried to get someone to fix it has been tossing me under the table or saying it is too old to fix. It only has a little over 123,000 miles on it.

It does not make any noise or leaking any oil at all no place.

 

Oil pump would likely had to have come out of the way..... I am REAL curious how he got the piston out thru the bottom though. That would require the crank being out of the way as well...... and putting it back in that way? Darn near impossible. If it was put together wrong though, the problem would have been immediately apparent......

You REALLY need to verify what oil pressure is doing.

 

Ok. He had the upper part of the engine taken a part due replacing all head gaskets. While in that stage as he move the crank to enough to get each area of the bolts of the piston rods and pushed them up from the bottom. Question is how much of the oil pump is in the way of doing that.