Valve Lapping, Axial Method - Endura Engine Rebuild - Episode 10.3
Axial valve lapping on the Endura Engine, comparing the proper appearance of the valve seat against a polished finish that does not guarantee a proper seal. After lapping paste and manual work, visual and tactile checks confirm seating before final chamber polishing and cylinder head painting
Video chapters
- 00:00 Let's Get Started!
- 00:40 Showing the difference between a lapped and unlapped valve
- 04:27 Valve lapping, axial method
- 06:46 Final valve lapping results
- 09:16 Starting port matching between exhaust ports and manifold
- 10:55 Porting results
Tools used
- valve lapping stick (axial manual tool used to tap the valve (axial method — no rotation))
- coarse valve grinding paste (coarse grit abrasive paste)
- fine valve grinding paste (fine grit abrasive paste)
- 180 grit sandpaper (180 grit)
- 220 grit sandpaper (220 grit)
- tracing paper (used to transfer and mark the position of the exhaust manifold holes)
Parts mentioned / replaced
- intake valves
- exhaust valves
- exhaust manifold gasket