So, my secondary ride, a 99 F350 with the V10, has a locked motor. It started as a broken wire to the tail light, then the mechanic fried the PCM, then it opened all the injectors, filling the entire intake full of gas, and making a giant mess. Well fast forward a couple days, spark plugs where removed, gas situation, and PCM situation where both fixed. The issue now is, it dumped gas through the PCV onto the cam shafts, filling the oil with gas, so we changed the oil, prefilled the filter, filled it full, started it up, it cranked, got up to about 800 RPM so the tach said, then slowed down, and stopped, seized solid. I'm thinking a stuck camshaft, but I'd like some input. It's full of new oil, has 263K on the clock. Yeah, I learned my lesson about that mechanic, he's about to retire anyhow, so yeah.

 

Oh, and it wasn't knocking like it had a main issue, for whatever reason, unless it's extremely cold, the mains have never made noise.

 

263k miles? Sorry, my guess is it needs a new engine.

 

That makes sense, I figure that the top end wasn't forgiving to having no oil. Gonna pull the valve covers tomorrow to see what exactly failed. The sad part is, this all stems from a tail light. Mechanics are pretty well licensed robbers at this point.

 

The top end doesn't tolerate oil starvation very well. The cam journals ride in machined surfaces in the aluminum head, there are no bearings. Steel grinding against aluminum doesn't last very long.

Interested to see what failed, post some photos if you can.

 

I will, it didn't even actually make it long enough for the oil to get pumped up there again. I know all about how these cams are designed, I'm not the biggest fan of it, but it's what the choice is at this point. The mechanic thinks it's a spun bearing downstairs, and his help thinks it's a stuck piston. I personally think a cam seized up from all the gas and no oil. The mechanic fried the PCM, which engaged the fuel pump permanently, and it also engaged the injectors permanently, so he claims.

 

did you pull plugs and try to crank? possible hydrolock. curious how testing a taillight turns on 8 injectors and a pump...

 

a spun rod bearing will NOT lock an engine. only when the rod breaks and loges on something will it lock

same with a camshaft... the steel will EAT the aluminum but will not lock the engine.
something entering the chain drive for the cam will.
cam breaking near the chain drive will lock the engine.
and YES a seized piston will lock an engine. but that takes lots of Heat.. like the engine was running.

a broken valve can lock an engine... and some times a BENT valve can lock an engine.

or a valve freezing in its valve guide and pulls the guide out of the head will lock an engine.

best of luck with your truck... try and find a low mileage used engine.. or a claim on HIS insurance company.

the killing the computer trying to fix a tail Light is BULL... and a lot of it.

retired auto mechanic 43 years.

 

I've seen the 4.6, similar design, hydro locked, and broke rod sending it through the side of the block. Even with the rod flopping around, the engine kept on running.???

 

So, the cam isn't stuck, now it's on to looking at the bottom end, I'm curious to see what happened precisely. I have pulled the plugs, it's not hydrolocked, it's full of brand new oil, and won't turn. The engine looks like it's a good bit lower than 264K, so I'm going to look into it because I'm curious as to what failed. I honestly don't get how you fry a PCM fixing a tail light either, unless it was bad to start with and it finally quit. Out of curiosity, what would a 3v conversion take? I know someone with a 150K 3v, and I'm curious as to what it would take, and if the intake and all would bolt on.

 

I have no idea WHAT he did to your truck


but I have NEVER seen all 8 injectors stay open at the same time...


ONE YES,, never more then 1.. and I have been repairing/servicing computer controlled cars since the early 80's...


can you say Chrysler Lean Burn.....
and WHO mounds a computer on an air intake snorkel above a 600 degree exhaust manifold?????

 

Can you turn the engine at the crank snout, or at the flywheel?

 

Nope, I figured out though, I looked at the old PCM before it went back, it was a donor from a different truck, because it had a U-Haul inspection sticker from 04 (Truck is an older U-Haul), and it looks like it's been living poorly for years, I've seen shorted PCMs, they looked nothing like that, probably has something to do with that mean exhaust leak on that side from the garbage studs Ford used. As for turning it, no, you can turn the cams, but not the crank, so the next step is to pull the pan. I managed to learn today that when the PCM surrendered, it started running the pump non stop and the injectors must've opened, or it forced gas around them. It's really quite confusing, and I don't get how precisely he could've done something like that, and believe me, I've seen barbarians working on car wiring.

 

are the chains not connected from the crank to the cam? did you take them off or did they break?

 

They're connected, the way I check the cams is, feel the slack in the chain, move cam to take up slack, if you do it, the cam isn't seized. Most chains have slack in them after a while