We’ve been overhauling a Caterpillar 3408 engine this week.
During the overhaul, we’ve come across a common situation, often found with diesel engines that isn’t always that easy to diagnose from the outset or decide on the correct action without all the information.
Now, because it’s part of the combustion chamber, you’ll appreciate it’s vital that things are right with the cylinder bore – it’s the most important part of the engine, and if things aren’t right, the results can be catastrophic.
The problem is that it’s pretty difficult to see whether everything IS right, especially if you’re looking at pictures.
From the photos below can you tell which one is scored? Are there bigger problems? What can be done about it?
To spot the scoring, the borescope is great at giving an indication, but “indication” is not enough, it needs to be backed up by a full inspection, which includes checking the internal diameter, viewing by the naked eye, and feel, with your fingernail.
The next steps will depend on the amount of scoring, the area it is in, the depth and whether the liner is chromed and most importantly the cause of the scoring!
If you’ve come across similar issues, have concerns about your liner condition, or want the condition checked, leave a comment.
