Crankcase pressure

[bwake]

The following information is directly from Cat SIS with a prefix of 1YN. If you'll get me the ESN I'll double check the tolerances to what is posted below, but I'm guessing they're all the same. I don't think I'd worry about the current liner protrusion (projection) unless it's just for diagnostic knowledge. Depending on the horsepower of this engine, I'd shoot for the high end of the tolerances listed to get a better head gasket seal. As Rawze has said, that engine has been dusted or possibly an excessive amount of ether was used at some point.

Check the projection at four locations (every 90 degrees) around each cylinder liner.

Specifications
Liner Projection
0.040 to 0.200 mm (0.0016 to 0.0079 inch)
Maximum Variation in Each Liner
0.050 mm (0.0020 inch)
Maximum Average Variation Between Adjacent Liners
0.050 mm (0.0020 inch)
Maximum Variation Between Liners
0.100 mm (0.0040 inch)
If a liner does not meet the recommended cylinder liner projection specification, check the following parts:
The depth of the cylinder block bore should be 100.00 ± 0.03 mm (3.937 ± 0.001 inch).
The liner flange should be 100.12 ± 0.03 mm (3.942 ± 0.001 inch).
If the depth of the cylinder block bore is out of specification, replace the cylinder block. Then repeat the liner projection measurements. If the liner flange is out of specification, replace the liner. Then repeat the liner projection measurements.