I finally cranked this thing after some updates and PM. The crank time seems very long, the logs indicate it is taking a long time to build pressure for some reason. I did pull the plugs on the oil rails and installed an HPX only to pull it back off after learning some things on here. The factory plugs were reinstalled. I figured I would suck the hpop oil out and put fresh in while I was at it. That is all I did that was oil system related, aside from switching to Rotella 5w-40 synthetic (have no idea what was in it before).

This truck cranked really quick before I tore it down. Could the oil viscosity make for long crank times or an air bubble trapped? It looks to be taking a while to build pressure from the logs. Also, the EOT is doing a funky oscillating, is that normal?

I haven't driven it yet, just idled while doing the coolant flush.







And another after a little more running:

 

On another note, I'm not sure I'm buying the EOT ot the ECT on the lower log, the gauge never even made it to normal temp, thermostat never opened, and heater hoses were only warm.

Edit - The ECT shows negative numbers anyway...

 

I too, once upon a time, changed the oil and installed 0w-40 fully synthetic engine oil. It made for some long crank times and wouldn't start on the first or even second try. I took it to a trusted friend and diesel mechanic and he mentioned changing the high pressure oil pump because that pressure was low. When I mentioned what I had put in it, he said that could be the problem. I dumped that oil out and went back with Kendall 15w-40. No problem since then. That was about 7 years ago. I don't think it gets cold enough in NC to run the lower viscosity oil.

 

Taking a long time to crank is normal after the HP oil system has been cracked open. Is your truck ZF6 or 4R100? The two logs show different ECT readings.

 

Disregard the ECT temps, they are wrong, not sure if it's a FORscan issue or the actual sensor. This is a ZF6 truck. The gauge oil pressure, it doesn't read anything either until the instant it fires.

I forgot to mention, I did re-Oring the oil cooler and delete the EBPV (with garrett parts).

Usually, 10*F is about as cold as it gets here.

 

Just FYI, there are in fact two ECT sensors on a ZF6 truck.

https://www.ford-trucks.com/forums/1...speed-ect.html

 

Thanks for the links Sous. I just looked, my E99 has nothing but plugs at both locations indicated in those links, and no provisions for the 2nd sensor in the harness - it doesn't branch off. I'm not sure what it is reading in FORscan, but it shows some erratic and ridiculous numbers, negative 203 degrees lol...

 

I thought I would throw this in here in case someone else winds up searching for an answer later on -

My long crank times have been cured by driving, it took a couple of days, but now it cranks within a second or so. These engines don't like air bubbles.

 

That is good news. Glad that is all it was.

 

That is typical. It can take up to 50mi and some spirited driving to get the air out.