Posted on by

ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – 001-047   Piston Rings

Table of Contents

Failure Analysis Inspection

Failure Analysis Inspection

 TOC

To check the ring gap, install the piston rings into the cylinder liner in which they were used. Position the rings below the ring reversal area.

Use the top part of a clean piston to correctly position the ring in the liner.

SMALL | MEDIUM | LARGE


Use a feeler gauge to inspect the ring end gap.

Ring Gap, Engines with CM554 Control Module

mm in
Top Ring 0.35 MIN 0.014
  0.50 MAX 0.020
Intermediate Ring 0.85 MIN 0.033
  1.15 MAX 0.045
Oil Control Ring 0.30 MIN 0.012
  0.60 MAX 0.023

Ring Gap, QSC Marine Engines with CM850 Control Module

mm in
Top Ring 0.35 MIN 0.014
  0.45 MAX 0.017
Intermediate Ring 0.40 MIN 0.016
  0.70 MAX 0.027
Oil Control Ring 0.30 MIN 0.012
  0.60 MAX 0.023

Ring Gap, All Other Engines with CM850 Control Module

mm in
Top Ring 0.30 MIN 0.012
  0.45 MAX 0.018
Intermediate Ring 0.85 MIN 0.033
  1.15 MAX 0.045
Oil Control Ring 0.30 MIN 0.012
  0.60 MAX 0.023

SMALL | MEDIUM | LARGE
Last Modified:  13-Sep-2010
Avatar photo

Published by Jack

Hello, I'm Jack, a diesel engine fan and a blogger. I write about how to fix and improve diesel engines, from cars to trucks to generators. I also review the newest models and innovations in the diesel market. If you are interested in learning more about diesel engines, check out my blog and leave your feedback.