X15 LINER FINISH

[bmdr]

(04-07-2025 )Rawze Wrote:  Its not a blast process, but a deposition process ... depositing hardened chromium in a thick layer onto the surface of the initial casting ... then honed back down to create the cross-hatching, and to meet the dimensional tolerances.


Looks perfectly fine to me. All the cross-hatching and roughness is on purpose to trap oil and reduce/minimize friction.

Too smooth = no place for oil to get trapped between the surfaces+ more contact surface making more resistance, and too rough = accelerated wear of the piston rings due to a 'sand-paper' type of effect.

Thanks for the reply! That's WAY more information my local Cummins distributor would give out. Was more less told to trust (its fine). Its a shame even after being fully Cummins certified in light, medium and heavy that this kinda of question cant be answered when asked Cummins at the dealer level. I'm a very thirsty for knowledge even after 30 years in service at a dealer, and even more so being have started my own business specializing in engine work. thanks again for the response which make perfect sense to me now.