Piston Rings Smoking
 

So for all those out there with Cold Start smoking trucks out there, (blue smoke), and you think it might be valve seals, think again.

130 000km / 80 000 mi on my truck

Spec = 172 psi
159 psi
160 psi
162 psi
168 psi
GOOD COMPRESSION!!!
Completely rebuilt cylinder head with new gaskette.

And I still leave my building in the morning in a smoke screen. :mad:
Nothing left but to replace rings. Thanks to all those who told me rings and NOT Seals. Guess I should have listened.

So your compression rings are good and your oil rings suck.
It's no wonder you didn't change rings, those are good compression readings!
Oil control ring is the bottom one, although the middle ring also helps it.

Change your PCV valve!

http://www.grantpistonrings.com/images/art.pnghttp://img.docstoccdn.com/thumb/orig/71851238.png

PCV valve was the first item replaced when i started investigating old smokey.

I don't see how a bad or in your case all bad oil control rings can push or allow oil past the compression rings into the combustion chamber with the readings you have.

The compression test was done, engine cold first thing in morning, all plugs out, full throttle, battery charger on. The best possible chance of having low compression is when engine is cold? anyway, those were the readings.

The cyl head had one bad cylinder (c0vered in burned oil) and the rest were lightly covered in burned oil.

Maybe scored cylinder, inwhich case the truck is scrap.

Before tearing into the engine or scrapping the truck try these things:
"Seafoam Treatment" If the oil rings are stuck the naphtha in the Seafoam could help free them up so they can do their job again.
"Restore": the stuff in restore fills scratches in the cylinder walls and so on.
"Lucas Oil Fuel Treatment": It is less aggressive than seafoam and it could help as a standard additive to your fuel.
"Lucas Oil oil stabilizer": It raises the viscosity of the oil and that could help reduce the oil getting past the rings.

Fixes in the can are temporary at best. Good luck, maybe you get another year out of it?