MTU Detroit Diesel 183 Series Technical Publication page 198

Group 03
Subgroup 7312
Page 2
20080/1 E 98-12
Removing piston rings
Set pliers to 128 mm dia.
Remove rings with the pliers in sequence from top to
bottom.
Pliers F3 0378 001
Inspecting piston rings
Replace rings during a W6 overhaul.
Visually inspect surface of piston rings for chipping prior
to reinstallation and after assembly; replace piston rings
as necessary.
Remove combustion residues from rings, decarbonize if
necessary. Check for damage, replace if necessary.
The condition/wear level of the chrome layer (arrow) is
decisive whether rings can be re-used or replaced.
The chrome layer should show no scoring, cracking or
thermal discolouration.
Replace sharp-edged rings.
Insert piston rings in unworn area of cylinder liner.
Measure piston ring end clearance: see Tolerance and
Wear Limits List 03-7312.
If measurements exceed the limits as per Tolerances
and Wear Limits List, replace piston rings.
Task Description