Title: Diagnose compression problems.
Course: Small Engine Technology II (20110-II) > Section: Diagnosing and Troubleshooting a Four-Stroke Engine

Diagnosis should follow manufacturers specifications and instructor’s guidelines and include

- inspecting and testing valve springs for squareness, pressure, and free height comparison and replacing as needed
- replacing valve stem seals
- inspecting valve guides for wear, checking valve lash, and reconditioning as needed
- inspecting valves for replacement
- inspecting valve seats and resurfacing or replacing as needed
- checking valve face-to-seat contact and servicing seats and valves as needed
- checking valve spring assembled height and valve stem height and servicing valve and spring assemblies as needed.

Process/Skill Questions:

- What measuring tools are required in the installation of the valve train?
- When should valve seats/faces need reworking?
- How are overhead valve systems different from L-head valve systems?