What would cause excess gas in the oil?

[SilverXJ]

One theory on my bearing failure. What would cause excess gas in the oil?

The only time the engine runs rich is like 30 seconds on cold start up, around 12:1 or so. Also, I had a faulty CPS and perhaps when diagnosing it the fuel in the cylinders might not have been burnt. At that time the plugs did have a lot of carbon on them.

What about glazed cylinder walls? How would that happen though?

The injectors aren't leaking as I had them checked last time.

[bbarrett]

Fuel pressure regulator?, I have saw Fords leak after shutdown and not leak under full pressure??????

[SilverXJ]

nah, its on top of the tank.

[4.whoa]

I think It would have to be quite a lot to get by the rings enough to kill your bearings that quick.(Unless you're using low tension rings I guess) And it would smell pretty strong.
Did you clear the oil passages w/air while it was apart?

[SilverXJ]

Last time the blocks was apart it was completely cleaned and re assembled. That was about a week and a half ago. No low tension rings. While I was playing around with the borescope in the oil pan I though I smelled a gas smell, but it may have just been something at the machine shop. I sent an oil sample off to blackstone labs. I'm just trying to find a possible cause.

[BADASYJ]

I would say you were over fueling. When you can smell it in the oil your getting cylinder wash, which de lubricates your rings. Bad stuff.

[SilverXJ]

Oil analysis is back. No gas in the oil, so i guess that throws that idea out.

[SilverXJ]

I would say you were over fueling. When you can smell it in the oil your getting cylinder wash, which de lubricates your rings.

If it was being over fueled, wouldn't I see it on the wideband?

[amcinstaller]

i was thinkin about this today, it just kinda popped in my head. im not sure how your gauge works, but if it has an oxygen sensor that it reads from could that sensor be bad and showing inaccurate data? a long shot, but it was just a thought in my head today.

[SilverXJ]

i was thinkin about this today, it just kinda popped in my head. im not sure how your gauge works, but if it has an oxygen sensor that it reads from could that sensor be bad and showing inaccurate data? a long shot, but it was just a thought in my head today.

I thought about that, but in closed loop, where the PCM reads the stock sensors, the wideband is reading exactly where the engine should be at under those conditions (~14.7:1). The wideband uses its own separate sensor. I would have to have 3 failed O2 sensors that failed in the same way.

[I6FAN]

High silicon---maybe WD40 after parts wash----Al piston alloys have Si, but the forged species usually have lower Si than say a hyper variety. I don't know what methodology used to analyze your oil, but sometimes elements that are similar [close to] other elements can be mistaken. I would think you would've have major cylinder wear if there was enough fuel in oil, that quick, to ruin bearings.

[SilverXJ]

Ahhh... I forgot about the WD after the parts wash! Silicon also comes from sealants, maybe the Si bearings wearing in a bit. No major piston wall wear, plus there isn't that much Aluminum present to indicate piston wear. And if there was that much fuel it would have shown up in the analysis. Its less than .5, or as they said, none.

Something else interesting is the lack of iron. I would have expected more being a new engine, but it has been through several washes since its last machining.

The other 3 columns were done on the stock engine.