Two weeks ago, while hot-rodding, I developed a faint knock. I figured it was something to do with a valve or head. I pulled the valve covers and couldn't spot anything wrong. I then started the engine to listen with the covers off and didn't notice any volume change. The knock seemed to be coming from deeper in the engine, but couldn't think of what it could be. I thought maybe an exhaust leak at the manifold that I couldn't locate. I decided to do nothing and see what happened. There was no noticable power loss.

Recently, I hooked it to a fairly heavy trailer and gave her a good workout. Truck died. I determined that the lpop failed because the hpop reservoir was empty. I filled the reservoir and cranked it over. Did not start, reservoir empty again.

Now to my question, Do you think the original knock I developed was from the lpop or something related to the lpop and that is what finally failed? What else should I look for when replacing the lpop?

---AutoMerged DoublePost---

Do I need to pull the engine to replace the lpop?

 

Oh are you in luck!!! We just did this (My boy is RocketNut!) on my son's '96.
You can get to the LPOP easily. It is 'under' the harmonic balancer in the front of the engine. Pull it apart and see if the pump is worn or is in tolerance. I'm going to guess it will be ok. . . . If so, check out his thread for more info:

https://www.dieselbombers.com/ford-p...-pressure.html

I would recommend not pulling the oil pan because the pick up tube is bullet proof so I don't think you will have that problem. I would say you have the same problem that my boy's did. Hopefully you can diagnois it with air shot in the oil passages. If so, just pull the timing cover and reinstall that air bleed plug.
Let us know if you need any more info or help!
Dan

 

I had read that and thank you.

Turns out, I have no pressure because I spun a bearing.

 

Oh no!! How did you determine that? If you haven't got it opened up yet then take your oil filter and cut it open and look for expensive 'shiney' stuff. If you did spin one there should be metal chunks on the outside of the element material.

 

Pulled pump, looked fine. My mechanic called his go to guy who said check the filter because a spun bearing can cause no pressure. There it was.

What causes a spun bearing? Was this preventable?