After two, weak compression checks we pulled a cylinder to examine an exhaust value. Once the cylinder was off we could see cam shaft and lifter spalling. If just the cylinders needed work then I could have proceeded with a less expensive top overhaul. When the cam is spalling the engine must be removed and the case split open to install a new cam shaft and lifters.
This is part 1 of a series that takes you the process of sending your engine out for service.
Click images for larger.
The cylinder we removed for inspection seemed largely okay. You can see the “bullseye” heat pattern on the smaller exhaust value. There does seem to be some pitting in the cylinder wall near the top. The large oval patch on the right side is the camera flash reflection of the cylinder head. Watch the video to view the cam shaft spalling and get look at the lifter.