Certificate of Qualification 310T Truck and Coach Technician Engine Practice Test 2026 – All-in-One Resource to Master Your Exam Preparation!

When selective fitting a set of dry liners to a cylinder block, a fractionally loose fit is essential. This approach allows for proper thermal expansion while ensuring that the liners can be easily installed and removed when necessary. A loose fit provides enough clearance to accommodate any expansion due to heat while preventing the liner from moving excessively, which could lead to wear or damage.

A tightly fitted or interference fit would prevent the liner from expanding properly under operating temperatures, creating stress and potentially causing failure. Additionally, it would make the installation and removal process much more challenging. Therefore, the practice of using a fractionally loose fit aids in maintaining the longevity and performance of both the liners and the cylinder block.