FYI 2018 F150 5.0 - TSB 19-2058 excessive oil consumption

[GT Pony]

I always thought the oiling was for temp reasons, not lubrication.
& I believe they are omitted in the gen 3

They are primarily for cooling, but obviously there is also going to be more oil splashing around on the cylinders too as a result of oil squirting up and splashing around underneath the piston.

Anyone have a Gen3 service manual to verify if the piston oil jets are still there or not?

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[Jetnoise]

They are primarily for cooling, but obviously there is also going to be more oil splashing around on the cylinders too as a result of oil squirting up and splashing around underneath the piston.

Anyone have a Gen3 service manual to verify if the piston oil jets are still there or not?

I can see some in wrist pin area but the normal flow is the other way in direction. How would it make it to the cylinder walls?

 

[GT Pony]

I can see some in wrist pin area but the normal flow is the other way in direction. How would it make it to the cylinder walls?

The oil jets are continuously squirting oil up towards the bottom of the piston. When the piston is at TDC there is some cylinder wall exposed, and I'm sure there must be some oil that gets splashed around up there and hits exposed cylinder wall area. Plus, oil being squirted up under the piston can also make it's way out through the oil control ring pack to the cylinder wall.

 

[Jetnoise]

So the ring pack or at least the the oil ring is exposed to the bottom side of the slug?

 

[Jetnoise]

Makes me wonder if gen 3 less the oil squirters plays a part in tick or the rattle. Watch 2020 come back with them ....
How high up the bore is the reported cylinder scoring? Top of piston or skirts causing them

 

[GT Pony]

So the ring pack or at least the the oil ring is exposed to the bottom side of the slug?

The piston has holes drilled into the oil ring pack groove in the piston. Those holes are also part of the oil scavenging function of the oil control rings.

 

[Jetnoise]

So those holes go through to the back side?
Not pressure inductive?

Appears MPR removes the piston oilers on their builds except maybe road racing applications.

 

[GT Pony]

So those holes go through to the back side?
Not pressure inductive?

Appears MPR removes the piston oilers on their builds except maybe road racing applications.

Yes, the holes go all the way through the piston. Those holes are where oil that is scraped off by the oil control rings escapes while the piston is on the down stroke. It's possible oil from squirters could flood those holes when the piston is on the up stroke while not much oil is being scraped off the cylinder wall.

So does MPR give a reason on why they don't like piston oil squirters?

 

[Jetnoise]

Yes, the holes go all the way through the piston. Those holes are where oil that is scraped off by the oil control rings escapes while the piston is on the down stroke. It's possible oil from squirters could flood those holes when the piston is on the up stroke while not much oil is being scraped off the cylinder wall.

So does MPR give a reason on why they don't like piston oil squirters?

Likely same reason Ford did....hp robbing Windage

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