Guide for judging condition of piston-running components HOT!

This booklet shall serve as a guide for judging the condition of piston running components (liners, pistons and piston rings) for the condition-based maintenance.

Actual wear rates strongly depend on operational factors, such as fuel oil in use, engine load profile, ambient conditions etc.
Engines operated under controlled conditions (e.g. regular piston underside drain oil analysis and visual inspection), piston
overhauls can be extended, and piston TBO beyond 30’000 hours is achievable.

By visual inspections, critical conditions of liners and piston rings can be detected at an early stage and if appropriate countermeasures are taken, sudden severe wear (scuffing),
losing pistons rings or liners, and consequential damages to neihbouring units can be avoided and the reliability enhanced.

Other measures such as analysis of piston underside drain or scrape oil sample will provide further information to monitor the liner and piston ring conditions.
We recommend carrying out visual piston underside inspections every 500 to 1000 running hours