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[Acton360]

Okay I have a 99 Ford Explorer sport. While driving the truck stalled and then would not start back up. I replaced the starter and once it was started its knocking from what sounds like every cylinder. It now shows no oil pressure what so ever. Not sure what it may be any ideas?

 

[fast_dave]

Okay I have a 99 Ford Explorer sport. While driving the truck stalled and then would not start back up. I replaced the starter and once it was started its knocking from what sounds like every cylinder. It now shows no oil pressure what so ever. Not sure what it may be any ideas?

Acton360

What 4.0 engine do you have - OHV or SOHC?

What trans do you have - M/T or Auto?

How many miles on your Ex?

 

[Acton360]

4.0
SOHC
Auto
About 100 thousand on the motor and 175xxx on tranny motor was changed out last year

 

[fast_dave]

4.0
SOHC motor was changed out last year

Was the motor swapped out with a used one that was obtained at a wrecking yard or?

If the motor was swapped out with a used one from a wreaking yard, was the wrecking yard able to tell you how many miles the Ex had that the motor was pulled out from?

Since you swapped out the original engine, I would bet (based on the well-documented SOHC engine history) that you already know about the SOHC engine's camshaft issues

With that said, on the face of it, it sounds like (with your current engine) that you experienced a catastrophic failure of either the oil pump, or some sub assembly that runs the oil pump.

I'm sure that based on your response to my questions, and as the issues you had are clarified further, sometime within this thread a SOHC engine expert will chime in

 

[Acton360]

It had about 80 thousand miles when it went in to mine. The old motor jumped time and tore it up when it did. I don't know much about explorers although been hearing some not so nice things here lately.

 

[fast_dave]

It had about 80 thousand miles when it went in to mine. The old motor jumped time and tore it up when it did. I don't know much about explorers although been hearing some not so nice things here lately.

So, to clarify, your wrecking yard motor had 80,000 miles on it when you got it.

How many miles have you put on the wrecking yard motor since you've had it installed in your Ex?

 

[Acton360]

about 25 thousand. It was running like a champ when it just stalled out at light. It idled down and shut off. Turns out that the bare wire that goes from the solenoid on the starter to the starter was frayed and broken so it wouldn't start back up. After replacing the starter and starting it for the first time it has all the valves rattling. it also for the first time ever reads no oil pressure. It will bounce up and down on start up but the goes away.

 

[Bobmbx]

Timing chain failure. You don't have any oil pressure because the plastic pieces are clogging the oil suction line/pump.

Same thing happened to my '02 ST. You can try pulling the oil pan and looking for pieces of the chain guides. You're knocking because there isn't any oil flowing to the valve lash adapter thing-a-ma-jigs.

 

[2000StreetRod]

Check compression

I suggest that you check compression on at least one cylinder in each bank. If there is low or no compression on one cylinder in either bank then check the rest of the cylinders in that bank. Low or no compression on all cylinders in a bank means camshaft timing problems.

When the right (rear) cassette fails pieces can get wedged between the jackshaft spiral gear and the gear that drives the intermediate shaft that drives the oil pump.

 

[Acton360]

If was a timing chain failure wouldn't it run ruff? It starts right up and minus the noise idles perfectly. Its not missing or sputtering at all.

 

[2000StreetRod]

timing chains

The timing chains are very strong and rarely fail. The plastic in the cassette guide assemblies are what usually fail. My rear cassette fell apart but the chain did not slip so the timing was not affected.

Your engine symptoms indicate oil pressure loss. You should not drive the vehicle until you resolve the oil pressure problem. When your engine died the symptoms did not indicate an oil pressure problem. It could have been due to fuel, ignition or compression (camshaft timing) problems. The only thing that you've fixed (the starter) is not related to the engine dying. If you cranked the starter enough plastic pieces may have been ground up or moved to block oil passages as Bobmbx posted. My oil pickup tube screen had a lot of particles lodged in it but not enough to block the oil flow.

Checking for compression is easier than pulling the oil pan or the valve covers. If the compression is bad on bank 1 (passenger side) due to timing chain slip then there's no point checking anything else because the engine has to come out to replace the right guide assembly (unless you pull the transmission and work under the vehicle).

If compression is good on the right bank then pull the pan and check for pieces. Unfortunately, I doubt that you can check to see if the oil pump driveshaft rotates unless you remove the block cradle (upper oil pan).

 

[Dezza85]

It does sound like a chain cassette failure. If if the main plastic guide has broken it plugs a hole in the oil gallery this would cause a drop in pressure however the fluctuations indicate a pump issue... i cant see plastic debris blocking the filter but may be possible i guess. STOP trying to start it all together if the cassettes are broken, slack in chains can jump teeth. Take the sump plate off and check for broken bits... go from there.
Just be advised the chains are not for the basic mechanic... they are complex and if you dont have the right tools you will need improvise and do lots of research. Also tty bolts arent included in most chain kits and are also needed. (Not many ppl coment on this).

 

[ranger7ltr]

Is your Explorer rwd or 4x4???

If it is RWD you can drop the pan and check the oil pump pickup and see if there is plastic guide debris blocking the pickup screen... It COULD also be caused by a broken oil pump driveshaft that broke because the oil pump locked up...You only need to remove the starter and albout 22 or 24 bolts and you can even reuse the oil pan gasket since it is a metal and neoprene sandwich piece...

If you have a 4x4 you will need to either drop the front diff and/or lift the engine to drop the pan..When I bought my 99 Ex the engine had no oil pressure... In that case the pickup screen was clogged with sludge and would not flow any oil at all...