F250txr burning oil

[T’s]

I bought a boat last year with 2 2005 F250s appr 230 hours. While running the boat the for the first time I noticed the starboard motor was smoking. Pulled the plugs and all looked good except the bottom port cyl was dark and oily. performed a compression test and all 6 cylinder were 120psi. Leak down test all 6 cyl. < 1 %. Performed carbon cleaning After taking it apart bottom port cyl had a broken oil ring. Next Starboard motor burning some oil but not smoking. Pull the plugs and are 5 good except the bottom port plug is darker than the rest. After taking it apart and remove the bottom port piston out. No broken rings but the bottom half of the cylinder is brown. Any body got any idea why bottom of the cylinder doesn’t look like the top of the cylinder?

[boscoe99]

Are you saying that you dismantled the motor because of oil consumption only?

[99yam40]

From what he wrote ,yes he tore it apart to see what was happening . probably thought that cylinder had a broke ring like the other motor had.

Now for his question on cylinder wall coloring,
Could it be overheating that would cause the cylinder wall toward the bottom to turn a darker color then the top?
that would be the only thing I can think of off hand.

[T’s]

I found a lot of salt and corrosion between the heads and the head gaskets and around the cylinders when I took the starboard motor apart. So I took the heads off of the port motor to clean the salt build up out Of it and remove the bottom port piston just to check it.

[T’s]

Thanks 99yam40.
Both motors had a lot of salt corrosion. Between the heads and head gaskets was completely clogged up. The cylinder block side of the head gaskets had a lot of corrosion deposits that was loose at the bottom of the cylinder block on both sides of a rubber pice that went below the bottom cylinder on the block. Do you think that heat could’ve caused the broken ring on the bottom port cylinder on the starboard motor and causing the rings on same cylinder on port motor to burn oil?

[99yam40]

I really do not know if heat could have cause the ring to break.
A guess would be that uneven heat expansion might stick a ring and then break.
still no idea how the ring would seat properly at the top of the other motors cylinder but not at the bottom

[TownsendsFJR1300]

With your description of EVERYTHING you've found with such low hours, it sounds like it's been abused / not maintained at all.

Can you hook up a YDS to the engine and see the true hours, RPM hours, etc?

Did you measure the bore and was it found to be more worn at the lower end of the cylinders?

Can you post some close up pic's?


Just found this, pretty interesting reading (not too long), re ring failure.
Dirty oil/lack of oil changes, over heating, carbon build up, etc:


https://www.lelubricants.com/lit/tec...20Cylinder.pdf

[pstephens46]

Good point on checking ECU for hours. Maybe the guage was swapped. Don’t hear much of these issues OP described. Those 3.3 motors are pretty damn tough. Almost as tough as our F150s...

[rodbolt17]

still aint believing a broken oil control ring.
would be wway more believable that the engine was never properly broken in,gets run very light and the blowby is condensing in the airbox.as #6 is the lowest runner that is the one that suck the condensed vapors.

[boscoe99]

From what he wrote ,yes he tore it apart to see what was happening . probably thought that cylinder had a broke ring like the other motor had.

Now for his question on cylinder wall coloring,
Could it be overheating that would cause the cylinder wall toward the bottom to turn a darker color then the top?
that would be the only thing I can think of off hand.

That is the way that I read it. Understood it.

Just could not believe it. Could not wrap my mind around that.

[zenoahphobic]

With your description of EVERYTHING you've found with such low hours, it sounds like it's been abused / not maintained at all.

Can you hook up a YDS to the engine and see the true hours, RPM hours, etc?

Did you measure the bore and was it found to be more worn at the lower end of the cylinders?

Can you post some close up pic's?


Just found this, pretty interesting reading (not too long), re ring failure.
Dirty oil/lack of oil changes, over heating, carbon build up, etc:


https://www.lelubricants.com/lit/tec...20Cylinder.pdf

That article is good but appears at least 25 years old (1994 revision) and makes reference to changes to engines of 25 years ago then that would be 50 plus yeas now. It actually is an advertisement for a particular oil.

[rodbolt17]

not uncommon to see a dark area. usually it was rust but the rings glazed it over. typically from sitting without proper storage(winterizing if you will.
sometimes you can actually see the wristpin cutout stained in the bore.
the oil control ring doesn't do much in the way of work.
it simply scrapes the cyl wall of excess oil when on a down stroke.
on the up stroke it is simply some metal along for the ride.

[pstephens46]

OP must have headed for the hills

[rodbolt17]

then we can go back to highjacking. man since I started on antibiotics for an infection in my lower eyelid,nope did not wear my safty glasses that day and took a chunk just in the lower eyelid, I have not had an adult berverage since Monday.

[pstephens46]

then we can go back to highjacking. man since I started on antibiotics for an infection in my lower eyelid,nope did not wear my safty glasses that day and took a chunk just in the lower eyelid, I have not had an adult berverage since Monday.

Sleeping better? Just curious. I’ve noticed over the years booze helps you fall asleep but not stay asleep very well.