I had recently found that my Oil was very much diluted / thinned by the
addition of Gas into the Oil.
I know that this excess Gas in the Oil was created while troubleshooting
a faulty MPI Fuel Injection Spider assembly where I could see excess fuel
in the MPI cover intake unit. In addtion, after this spider troubleshooting repair - I was experiencing Starter / Battery issues where I was cranking the engine with a No Start Condition continuously. This added to the diluted oil - "Flooded" the system ,as well.

Fortunate - I discovered this diluted Oil rather quickly - had only put
about 1 1/2 hours total of run time at idle and 2000 rpm while vehicle was parked with this diluted oil.

Question :
What wear did the engine experience during this time of diluted oil
( felt like water ) Bearings , Piston Rings , Cylinders Scored , etc.
Should I have much concern ?
What to look for in wear items ?

 

Ok. With what u you said id call the spider is bad.

1. gas in oil...spider.
2. the no start can be fouled plugs from the spider or excess fuel.
as far as wear.....replace the injection assembly. you seem like you caught it fast. do it, and if all seems good go with it. if its been ran little to nothing with fuel in oil you should be ok.


Go to rockauto dot com. a whole spider (fuel regulator system) is really reasonable compared to local.

 

I've always heard that a condition like that will damage the bores more than anything; the excess fuel washes the cylinders of oil. With only the run time you described, I wouldn't be too super worried. There's not much you can do, anyway, without tearing down the engine. Do a good oil change, and drive it. Maybe keep an eye on oil consumption/smoking.

 

Had this same problem with my 4.3

Replaced the fuel spider and changed the oil, no more fuel in oil!

 

Had some time to do a inspection of what the Thinned Oil may have worn.
Remember this Engine still only has 2.5 hours of total run time !

Dropped Oil Pan, Just starting Inspection.
# 3 Cylinder Bore - some very light scoring marks, appears like normal wear. I have not completely inspected all Cylinder Bores closely, thus far. Engine still installed - inspection from under vehicle and hesitant in hand turning Crank alot - unless I have oil everywhere.

Bearing Inspection :
Removed #1 Rod Bearing Cap - three very very lightly thin score marks.
# 1 Rod Journal - looks brand new.
Removed # 3 Main Bearing Cap - very light discoloration blotch area - looks brand new, otherwise.
# 1 Main Bearing Journal - looks brand new.

Next Step is to setup to Manually Oil Prime Engine prior to Turning Crank alot.
Next reply - I'll try to post some pic's.

 

With the previous ( post ) early inspection results , do you think I need to inspect the remaining Bearings and Journals ?